CA2039467A1 - Concrete composition for the manufacture of moulds, mould and process for the manufacture of a mould - Google Patents
Concrete composition for the manufacture of moulds, mould and process for the manufacture of a mouldInfo
- Publication number
- CA2039467A1 CA2039467A1 CA002039467A CA2039467A CA2039467A1 CA 2039467 A1 CA2039467 A1 CA 2039467A1 CA 002039467 A CA002039467 A CA 002039467A CA 2039467 A CA2039467 A CA 2039467A CA 2039467 A1 CA2039467 A1 CA 2039467A1
- Authority
- CA
- Canada
- Prior art keywords
- calcium
- concrete composition
- concrete
- composition according
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
- B29K2709/06—Concrete
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2909/00—Use of inorganic materials not provided for in groups B29K2803/00 - B29K2807/00, as mould material
- B29K2909/06—Concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00939—Uses not provided for elsewhere in C04B2111/00 for the fabrication of moulds or cores
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
Abstract
Concrete composition or the manufacture of moulds, mould and process for the manufacture of a mould ----------------------ABSTRACT
--------Compound concrete composition for the manufacture of moulds, c o m p r i s i n g : (1) a binder which comprises an alkaline-earth mineral sub-stance, a constituent made up of fine particles of a compoune other than an oxide, 90% of which have a particle size of between 1 and 150 µm with a median diameter of between 3 and 20 µm, these fine particles comprising particles of a substance which has a thermal conductivity higher than approximately 30 W/mK, chosen from silicon carbides, silicon carbonitrides, silicon nitrides, boron carbides, titanium carbides and tungsten carbides and a constituent made up of ultrafine particles at least 70% of which have a particle size smaller than 1 µm with a median diameter of between 0.3 and 0.8 µm, (2) water optionally with the addition of a dispersant, and (3) fillers comprising metal granulates and metal fibres, wherein the water/binder ratio is lower than 0.20 and the concrete composition has a thermal conductivity at 200°C which is equal to or higher than 5 W/m K.
Figure nil -
--------Compound concrete composition for the manufacture of moulds, c o m p r i s i n g : (1) a binder which comprises an alkaline-earth mineral sub-stance, a constituent made up of fine particles of a compoune other than an oxide, 90% of which have a particle size of between 1 and 150 µm with a median diameter of between 3 and 20 µm, these fine particles comprising particles of a substance which has a thermal conductivity higher than approximately 30 W/mK, chosen from silicon carbides, silicon carbonitrides, silicon nitrides, boron carbides, titanium carbides and tungsten carbides and a constituent made up of ultrafine particles at least 70% of which have a particle size smaller than 1 µm with a median diameter of between 0.3 and 0.8 µm, (2) water optionally with the addition of a dispersant, and (3) fillers comprising metal granulates and metal fibres, wherein the water/binder ratio is lower than 0.20 and the concrete composition has a thermal conductivity at 200°C which is equal to or higher than 5 W/m K.
Figure nil -
Description
~ r' The pre~ent invention ralates to a compound concreta composition for the manufacture of mould~
intended in particular for moulding article~ made of pla~tic.
Metalli~ed concrete mould~ have been propo~ed to make article~ made of pla~tic more economical to mould, in particular tho~e o~ large ~ize, such a3 body com-ponents for motor vehicles.
The compound concretes which form part of the constitution of the3Q mould~ mus~ combine different properties. Fir~tly, they must ensure good thermal conductivity, since these moulds are heated and/or cooled during the moulding operation.
Secondly, they must have mechanical propertieq which ensure good ductility and a satisfactory flexural strength, since - the moulds are sub~ected to a considerable mechanical ~treYs when they are being employed.
Finally, they must have a ~uitahls expan~ion coefficient which i~ compatible with that of the metal coating of the mould and possibly with that of metal components which are neQded for tha moulding and at lea3t a part of which is embedded in the concrete.
Tha ob~ective of the present invention i~ to 2S proposo a compo3ition exhibiting the propertie~ referred to above to a high degree and therefore being particularly suitable for the manufacture of metalli~ed concre~e mould~.
The ~ub~ect of the pre~ent invention i3 thus a compound concrete compo~ition for the manufacture of moulds, charactari~ed in that it compri~e~: (1) a binder which comprises an alkalina-earth mineral sub3tance chosen ~rom calcium alum~na~e or calcium ~ilicoalumina~e metallurgical ~lags, aluminou~ cement~ of the calcium monoaluminat~ and calcium dialuminate types, silico-aluminou~ cements, calcium or barium ~ilicate~ and alkaline-earth metal oxldes which have been calcined at a very high temperature beforehand, of the magne~ia, dolom$te, lime and ba~ytes group, a con~tituent made up ~, ~J ~
of fine particles of a compound other than an oxide, 90~
of w~ich have a partlcl~ size of bet~een 1 and 150 ~m with a median diameter of between 3 and 20 ~m, these fine par~icle~ compri~ing particlas of a 4ubstance which has a thermal conductivity higher than approximately 30 ~/mK
choqen from ~ilicon carbide~, silicon carbonitrides, silicon nitrideR, boron carbides, titanium carbides and tung~ten carbides/ and a con~tituent made up of ultrafine particles at lea~t 70% o~ which have a particle size ~maller than 1 ~m with a median diameter of between 0.3 and 0.8 ~m, (2) water optionally with the addition of a disper~ant, and (3) fillers compri.qing metal granulate~
and metal fibres, the water~binder ratio boing lower than 3.20, the concrete compo4ition having a thermal conduc-tivity at 200C which i~ equal to or higher than 5 W/m K.
The thermal conductivity of 30 W/m Kof the fine particls~ i~ markedly superior to that of ~ ~eparticle~
prssRnt in the cement~ which are usually employed.
In addition, the fine particle4 advantageously have a high hardne~, prefarably of at lea3t 1800 kg/mm2 Knoop hardnes 8 .
The metal granulate~ are preferably choYen from 4hot made of steel, ~tainles~ steel, cast iron, copp~r and any metal or alloy which i chemically compatible with th~ binder.
Tho motal fibre~ are ad~antageously ~te~l or ~tainles~ ~te~l fibres.
Anothor 3ub~ect of the invention i~ a mould compr~sing two half-moulds made of metallised concrete, intended in particular fsr moulding article~, preferably of larg~ size, made of pla~ic, compri~ing a compound concrete composition ~uch a~ defined above.
Another ub~ect of the invention i~ a proce~ for the manu~acture of a mould con~isting of two half-mould~
according to ths invention, comprising the following stages:
- produc~io~ of master model~ of the half-mould~, using a re~in, - metallisation of the ma~ter model~, ~ J ~
- ca~ting a concrete according to the invention, followed by a heat treatment.
Once the casting of the concrete ha~ taken place, the concrete i~ advantageously allowed to set at a temperature of 20C for a period of 16 to 24 hours, it is stoved in an oven at a temperature ranging from room temperature to approximately 60C, the temperature is raised to approximately 2S0C at a rate ranging from 1 to 20C/h, it is left at this temperature for a period of 6 to 18 h, it is cooled to a temperature of 70 to 80C at a rate of 1 to 20C/h and i3 removed from the oven at this temperature.
The period of 6 to 8 hours is determined a~ a function of the mas3 of the article to be treated.
The mineral substance of which the binder (1) consists i8 advantageously an aluminous cement.
The best performance has been obtained with a Secar 71 cement. It is preferably added in a proportion which varies between 10 to 30~ by weight of the binder.
90% of the fine particles have a particle ~ize of between 1 and 150 ~m with a median diameter of between 3 and 20 ~m.
They are added in a proportion which varies preferably between 14 and 54% by weight of the binder.
At least 70~ of the ultrafine particles have a particle si2e smaller than 1 ~m with a median diameter of between 0.3 a~d 0.8 ~m. ~hey are chosen from microsilica, chromium oxide, titanium oxide, zirconium oxide and aluminium oxide.
Micro~ilica is pxeierred in particular, espe-cially the thermal microsilica obtained by reduction of zirconium silicate, which ha~ a low speci~ic surface and absorb~ little wAter.
The ultrafine particle~ are added in a proportion which varies preferably between 14 and 54% by weight of the binder.
Water is added in a quantity such that the water/binder ratio is lower than 0.20, preferably lower than 0.16/ by weight.
~ ~ DJ ",~
The quantity which i~ added i~ as small as po~sible, to limit the porosity of the concrete, insofar as the thenmal conductivity of the concrete mu~t be high.
A dispersant i~ optionally added, advantageously chosen from alkali metal hexametaphosphates, tripolyphos-phates and polynaphthalenesulphonates. In this respect, preference will be ~iven to sodium hexametaphosphate or sodium tripolyphosphate.
The metal fibre~ are advantageously made of steel or stainle3s steel.
Their diameter is preferably between 80 ~m and 150 ~m and their length between 2 mm and 5 mm.
The steel composition range i~ as follows:
C(X) Mn(~:) Sl P S CrM~
15 at~el 0.05-0.012 0.7-1 0,~1S-0.020 0.01-0.04 --- --- ---~taln .
Bteel S0.07 Sl Sl S0.045 S0.03 1~-18 0.9-1.2 They are added in a proportion of 200 to 300 part~ by weight, preferably 110 to 250, per 100 parts by weight of alkaline-earth mineral ~ubstance.
The metal granulate~ are advantageously round or angular ~hot made of steel, stainles steel, cast iron, copper or any metal or alloy which i~ chemically com-patible with the binder, or consist~ of a mixture of the~e components, with copper making it pos~ible to increa~e the thermal conductivity of the final concrete, and ca~t iron being pr~ferred for co~t rea~ons and for its mechanical properties.
The metal granulates have a particle size of between 90 ~m and 850 ~m and are preferably chosen from one or more of the following range :
- fir~t range: particle ~ize of between 90 and 425 ~m, 70~ of the shot being between 180 and 355 ~m;
- ~econd range: particle siæe of between 125 and 600 ~m, 70~ of the ~ho~ being between 300 and 500 ~m;
~ third range: particle size of between 90 and 425 ~m, 65% of the shot being between 180 and 425 ~m.
The cast iron ~hot is chosen especially from ~? ~ 6~
haematite shot with a hardnass of 50-70 Rc, in which the principal phase i5 cementite and the C, P and S
compo3ition i~ 3%, 0.1~ and 0.1% r~pectively, and "~uper rapid" cast iron shot of hardnes~ 65-67 Rc, in which ths principal phase i~ cementite and the C, P and S composi-tion iq 3%, 0.1% and 0.1% reRpectivsly.
Among the ~teel ~hot~ preference i~ given to the ~hots marketed by the Wheelabrator-Allevard company.
The metal granulates are added in a proportion of 10600 to 800 part~, pre~erably 660 to 780 partR p~r ln0 partR by waight of alkaline-earth mineral substancQ.
The fini~hed concxete ha~ the following propertie~ after heat treatment at 250C, a~ described above:
15- compre~iva breaking stress OC highPr than or e~ual to 160 MPa - flexural breaking Rtreq~ of - LOP proportionality limit or ela~ticity limit higher than or equal to 25 NPa 2~- NOR breaking stre~4 higher than or equal to 30 MPa - deformation at break: ~ higher than or equal to 0.15%
- p3ro9ity lower than or equal to 20~, preferably to 16%
- thermal conductivity at 200C : higher than or equal to 5.0 W/m R.
Examples of formulatio~ of the concrete according to the i~vention will be given ~elow.
~3 ~
ExamplQ i % by part~ by weight weight ________________________________________________________ S.S. ~hot 48.7 696 (O.105 to 0.210 mm) Steel fibres 16.3 232 (3 mm - ~ 0.150 mm) Reground SiC (-1 to 150 ~m)17.5 250 Microsilica (0.01 to 4 ~m; median diameter 0.7 ~m; particle sizes 90~ s4 ~m and 10% ~ 002 ~m)10.5 150 Secar 71 cement 7 100 Na tripolyphosphate ~ O.25 3.6 _________,____________~_________________________________ Water (%) 75 The concrete i~ vibro-ca~t and then left open to the air for 24 hours ~o ensure its hydraulic setting before the heat treatment.
Example 2 A concrete formulation wa~ prepared separately by again taking the 5ame con~tituent as in Example 1, except that the s~ainles~ ~teel ~hot wa~ replaced with 696 parts of $70 chst iron shot (90 to 425 ~m particl ~iza3/ the water being addad in a proportion of 68.6 part per 100 parts of Secar 71 cement.
~he propertie~ of the concrete~ of Example~ 1 and 2 are summarised in the table below:
They have been mea~ured on te~t piece3 4 x 4 x 16 cm (~) and 200 x 80 x 10 mm (~b) in size.
~ 7 ~
r Ex. 1 Ex. 2 ______________________________________________~_________ Relative density 3O90 3.63 AENOR poro~ity (~) 16 10. 7 S ~ OC (MPa) 196 209 M O R (MPa)¦flexural41 45 LOP (NPa) ~measurements 33.5 37 (%) J 0.23 0.28 Thermal conductivity .
W/m X 5.00 6.20 .
All the parameters were mea~ured a~ter ~toving at + 240C
to 250C.
intended in particular for moulding article~ made of pla~tic.
Metalli~ed concrete mould~ have been propo~ed to make article~ made of pla~tic more economical to mould, in particular tho~e o~ large ~ize, such a3 body com-ponents for motor vehicles.
The compound concretes which form part of the constitution of the3Q mould~ mus~ combine different properties. Fir~tly, they must ensure good thermal conductivity, since these moulds are heated and/or cooled during the moulding operation.
Secondly, they must have mechanical propertieq which ensure good ductility and a satisfactory flexural strength, since - the moulds are sub~ected to a considerable mechanical ~treYs when they are being employed.
Finally, they must have a ~uitahls expan~ion coefficient which i~ compatible with that of the metal coating of the mould and possibly with that of metal components which are neQded for tha moulding and at lea3t a part of which is embedded in the concrete.
Tha ob~ective of the present invention i~ to 2S proposo a compo3ition exhibiting the propertie~ referred to above to a high degree and therefore being particularly suitable for the manufacture of metalli~ed concre~e mould~.
The ~ub~ect of the pre~ent invention i3 thus a compound concrete compo~ition for the manufacture of moulds, charactari~ed in that it compri~e~: (1) a binder which comprises an alkalina-earth mineral sub3tance chosen ~rom calcium alum~na~e or calcium ~ilicoalumina~e metallurgical ~lags, aluminou~ cement~ of the calcium monoaluminat~ and calcium dialuminate types, silico-aluminou~ cements, calcium or barium ~ilicate~ and alkaline-earth metal oxldes which have been calcined at a very high temperature beforehand, of the magne~ia, dolom$te, lime and ba~ytes group, a con~tituent made up ~, ~J ~
of fine particles of a compound other than an oxide, 90~
of w~ich have a partlcl~ size of bet~een 1 and 150 ~m with a median diameter of between 3 and 20 ~m, these fine par~icle~ compri~ing particlas of a 4ubstance which has a thermal conductivity higher than approximately 30 ~/mK
choqen from ~ilicon carbide~, silicon carbonitrides, silicon nitrideR, boron carbides, titanium carbides and tung~ten carbides/ and a con~tituent made up of ultrafine particles at lea~t 70% o~ which have a particle size ~maller than 1 ~m with a median diameter of between 0.3 and 0.8 ~m, (2) water optionally with the addition of a disper~ant, and (3) fillers compri.qing metal granulate~
and metal fibres, the water~binder ratio boing lower than 3.20, the concrete compo4ition having a thermal conduc-tivity at 200C which i~ equal to or higher than 5 W/m K.
The thermal conductivity of 30 W/m Kof the fine particls~ i~ markedly superior to that of ~ ~eparticle~
prssRnt in the cement~ which are usually employed.
In addition, the fine particle4 advantageously have a high hardne~, prefarably of at lea3t 1800 kg/mm2 Knoop hardnes 8 .
The metal granulate~ are preferably choYen from 4hot made of steel, ~tainles~ steel, cast iron, copp~r and any metal or alloy which i chemically compatible with th~ binder.
Tho motal fibre~ are ad~antageously ~te~l or ~tainles~ ~te~l fibres.
Anothor 3ub~ect of the invention i~ a mould compr~sing two half-moulds made of metallised concrete, intended in particular fsr moulding article~, preferably of larg~ size, made of pla~ic, compri~ing a compound concrete composition ~uch a~ defined above.
Another ub~ect of the invention i~ a proce~ for the manu~acture of a mould con~isting of two half-mould~
according to ths invention, comprising the following stages:
- produc~io~ of master model~ of the half-mould~, using a re~in, - metallisation of the ma~ter model~, ~ J ~
- ca~ting a concrete according to the invention, followed by a heat treatment.
Once the casting of the concrete ha~ taken place, the concrete i~ advantageously allowed to set at a temperature of 20C for a period of 16 to 24 hours, it is stoved in an oven at a temperature ranging from room temperature to approximately 60C, the temperature is raised to approximately 2S0C at a rate ranging from 1 to 20C/h, it is left at this temperature for a period of 6 to 18 h, it is cooled to a temperature of 70 to 80C at a rate of 1 to 20C/h and i3 removed from the oven at this temperature.
The period of 6 to 8 hours is determined a~ a function of the mas3 of the article to be treated.
The mineral substance of which the binder (1) consists i8 advantageously an aluminous cement.
The best performance has been obtained with a Secar 71 cement. It is preferably added in a proportion which varies between 10 to 30~ by weight of the binder.
90% of the fine particles have a particle ~ize of between 1 and 150 ~m with a median diameter of between 3 and 20 ~m.
They are added in a proportion which varies preferably between 14 and 54% by weight of the binder.
At least 70~ of the ultrafine particles have a particle si2e smaller than 1 ~m with a median diameter of between 0.3 a~d 0.8 ~m. ~hey are chosen from microsilica, chromium oxide, titanium oxide, zirconium oxide and aluminium oxide.
Micro~ilica is pxeierred in particular, espe-cially the thermal microsilica obtained by reduction of zirconium silicate, which ha~ a low speci~ic surface and absorb~ little wAter.
The ultrafine particle~ are added in a proportion which varies preferably between 14 and 54% by weight of the binder.
Water is added in a quantity such that the water/binder ratio is lower than 0.20, preferably lower than 0.16/ by weight.
~ ~ DJ ",~
The quantity which i~ added i~ as small as po~sible, to limit the porosity of the concrete, insofar as the thenmal conductivity of the concrete mu~t be high.
A dispersant i~ optionally added, advantageously chosen from alkali metal hexametaphosphates, tripolyphos-phates and polynaphthalenesulphonates. In this respect, preference will be ~iven to sodium hexametaphosphate or sodium tripolyphosphate.
The metal fibre~ are advantageously made of steel or stainle3s steel.
Their diameter is preferably between 80 ~m and 150 ~m and their length between 2 mm and 5 mm.
The steel composition range i~ as follows:
C(X) Mn(~:) Sl P S CrM~
15 at~el 0.05-0.012 0.7-1 0,~1S-0.020 0.01-0.04 --- --- ---~taln .
Bteel S0.07 Sl Sl S0.045 S0.03 1~-18 0.9-1.2 They are added in a proportion of 200 to 300 part~ by weight, preferably 110 to 250, per 100 parts by weight of alkaline-earth mineral ~ubstance.
The metal granulate~ are advantageously round or angular ~hot made of steel, stainles steel, cast iron, copper or any metal or alloy which i~ chemically com-patible with the binder, or consist~ of a mixture of the~e components, with copper making it pos~ible to increa~e the thermal conductivity of the final concrete, and ca~t iron being pr~ferred for co~t rea~ons and for its mechanical properties.
The metal granulates have a particle size of between 90 ~m and 850 ~m and are preferably chosen from one or more of the following range :
- fir~t range: particle ~ize of between 90 and 425 ~m, 70~ of the shot being between 180 and 355 ~m;
- ~econd range: particle siæe of between 125 and 600 ~m, 70~ of the ~ho~ being between 300 and 500 ~m;
~ third range: particle size of between 90 and 425 ~m, 65% of the shot being between 180 and 425 ~m.
The cast iron ~hot is chosen especially from ~? ~ 6~
haematite shot with a hardnass of 50-70 Rc, in which the principal phase i5 cementite and the C, P and S
compo3ition i~ 3%, 0.1~ and 0.1% r~pectively, and "~uper rapid" cast iron shot of hardnes~ 65-67 Rc, in which ths principal phase i~ cementite and the C, P and S composi-tion iq 3%, 0.1% and 0.1% reRpectivsly.
Among the ~teel ~hot~ preference i~ given to the ~hots marketed by the Wheelabrator-Allevard company.
The metal granulates are added in a proportion of 10600 to 800 part~, pre~erably 660 to 780 partR p~r ln0 partR by waight of alkaline-earth mineral substancQ.
The fini~hed concxete ha~ the following propertie~ after heat treatment at 250C, a~ described above:
15- compre~iva breaking stress OC highPr than or e~ual to 160 MPa - flexural breaking Rtreq~ of - LOP proportionality limit or ela~ticity limit higher than or equal to 25 NPa 2~- NOR breaking stre~4 higher than or equal to 30 MPa - deformation at break: ~ higher than or equal to 0.15%
- p3ro9ity lower than or equal to 20~, preferably to 16%
- thermal conductivity at 200C : higher than or equal to 5.0 W/m R.
Examples of formulatio~ of the concrete according to the i~vention will be given ~elow.
~3 ~
ExamplQ i % by part~ by weight weight ________________________________________________________ S.S. ~hot 48.7 696 (O.105 to 0.210 mm) Steel fibres 16.3 232 (3 mm - ~ 0.150 mm) Reground SiC (-1 to 150 ~m)17.5 250 Microsilica (0.01 to 4 ~m; median diameter 0.7 ~m; particle sizes 90~ s4 ~m and 10% ~ 002 ~m)10.5 150 Secar 71 cement 7 100 Na tripolyphosphate ~ O.25 3.6 _________,____________~_________________________________ Water (%) 75 The concrete i~ vibro-ca~t and then left open to the air for 24 hours ~o ensure its hydraulic setting before the heat treatment.
Example 2 A concrete formulation wa~ prepared separately by again taking the 5ame con~tituent as in Example 1, except that the s~ainles~ ~teel ~hot wa~ replaced with 696 parts of $70 chst iron shot (90 to 425 ~m particl ~iza3/ the water being addad in a proportion of 68.6 part per 100 parts of Secar 71 cement.
~he propertie~ of the concrete~ of Example~ 1 and 2 are summarised in the table below:
They have been mea~ured on te~t piece3 4 x 4 x 16 cm (~) and 200 x 80 x 10 mm (~b) in size.
~ 7 ~
r Ex. 1 Ex. 2 ______________________________________________~_________ Relative density 3O90 3.63 AENOR poro~ity (~) 16 10. 7 S ~ OC (MPa) 196 209 M O R (MPa)¦flexural41 45 LOP (NPa) ~measurements 33.5 37 (%) J 0.23 0.28 Thermal conductivity .
W/m X 5.00 6.20 .
All the parameters were mea~ured a~ter ~toving at + 240C
to 250C.
Claims (13)
1. Compound concrete composition for the manufacture of moulds, comprising (1) a binder which comprises an alkaline-earth mineral substance selected from calcium aluminate or calcium silicoaluminate metallurgical slags, aluminous cements of the calcium monoaluminate and calcium dialuminate types, silico-aluminous cements, calcium or barium silicates and alkaline-earth metal oxides which have been calcined at a very high temperature beforehand,of the magnesia, dolomite, lime and barytes group, a constituent made up of fine particles of a compound neither than an oxide, 90% of which have a particle size of between 1 and 150 µm with a median diameter of between 3 and 20 µm, these fine particles comprising particles of a substance which has a thermal conductivity higher than approximately 30 W/mK , selected from silicon carbides, silicon carbonitrides, silicon nitrides, boron carbides, titanium carbides and tungsten carbides, and a constituent made up of ultrafine particles at least 70% of which have a particle size smaller than 1 µm with a median diameter of between 0.3 and 0.8 µm, (2) water optionally with the addition of a dispersant, and (3) fillers comprising metal granulates and metal fibres, wherein the water/binder ratio is lower than 0.20 and the concrete composition has a thermal conductivity at 200°C which is equal to or higher than 5 W/m K.
2. Concrete composition according to Claim 1, wherein the fine particles are selected from particles which have a hardness of at least 1800 kg/mm2 Knoop hardness.
3. Concrete composition according to Claim 1, wherein the ultrafine particles are selected from microsilica, chromium oxide, titanium oxide, zirconium oxide and aluminium oxide, preferably microsilica.
4. Concrete composition according to Claim 1, wherein the metal granulates are selected from shot made from stainless steel, cast iron, copper or any metal or alloy which is chemically compatible with the binder, or from mixtures of these components.
5. Concrete composition according to Claim 1, wherein the metal fibres are steel or stainless steel fibres.
6. Concrete composition according to Claim 1, wherein the alkaline-earth mineral substance is an aluminous cement.
7. Concrete composition according to Claim 1, wherein the dispersant is chosen from alkali metal tripolyphosphates, hexametaphosphates and poly-naphthalenesulphonates, preferably Na tripolyphos-phate and Na hexametaphosphate.
8. Concrete composition according to Claim 1, wherein the binder (1) comprises from 10 to 30% of an alkaline-earth substance selected from calcium alum-inate or calcium silicoaluminate metallurgical slags, aluminous cements of the calcium monoaluminate and calcium dialuminate types, silicoaluminous cements, calcium or barium silicates and alkaline-earth metal oxides which have been calcined at a very high temp-erature beforehand, of the magnesia, dolomite, lime and barytes group; from 14 to 54% of fine particles 90% of which have a particle size of between 1 and 150 µm with a median diameter of between 3 and 20 µm, and from 14 to 54% of ultrafine particles at least 70%
of which have a particle size smaller than 1 µm with a median diameter of between 0.3 and 0.8 µm.
of which have a particle size smaller than 1 µm with a median diameter of between 0.3 and 0.8 µm.
9. Concrete composition according to Claim 1, comprising per 100 parts of alkaline-earth substance selected from calcium aluminate or calcium silico-aluminate metallurgical slags, aluminous cements of the calcium monoaluminate and calcium dialuminate types, silicoaluminous cements, calcium or barium silicates and alkaline-earth metal oxides which have been calcined at a very high temperature beforehand, of the magnesia, dolomite, lime and barytes qroup, from 200 to 300 parts, preferably from 110 to 250 parts, of metal fibres and from 600 to 800 parts, preferably from 660 to 780 parts, of metal granulates.
10. Concrete composition according to Claim 1, wherein the water/binder ratio is lower than 0.16.
11. Mould consising of two half-moulds made of metallised concrete, comprising a concrete composition as defined in Claim 1.
12. Process for the manufacture of a mould according to Claim 11, comprising the following stages:
- production of master models of the half-moulds, using a resin - metallisation of the master models - casting a concrete as defined in Claim 1, followed by a heat treatment.
- production of master models of the half-moulds, using a resin - metallisation of the master models - casting a concrete as defined in Claim 1, followed by a heat treatment.
13. Process according to Claim 12, wherein after the concrete has been cast the concrete is allowed to set at a temperature of approximately 20°C for a period of 16 to 24 hours, is stoved in an oven at a temperature ranging from room temperature to approximately 60°C, the temperature is raised to approximately 250°C at a rate ranging from 1 to 20°C/h, the concrete is left at this temperature for a period of 6 to 18 h, is cooled to a temperature of 70 to 80°C at a rate of 1 to 20°C/h and is removed from the oven at this temperature.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9004193A FR2660237B1 (en) | 1990-04-02 | 1990-04-02 | CONCRETE COMPOSITION FOR MOLDS, MOLD AND METHOD FOR MANUFACTURING A MOLD. |
| FR9004193 | 1990-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2039467A1 true CA2039467A1 (en) | 1991-10-03 |
Family
ID=9395355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002039467A Abandoned CA2039467A1 (en) | 1990-04-02 | 1991-03-28 | Concrete composition for the manufacture of moulds, mould and process for the manufacture of a mould |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5188791A (en) |
| EP (1) | EP0451014A1 (en) |
| CA (1) | CA2039467A1 (en) |
| FR (1) | FR2660237B1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2076578A1 (en) * | 1992-08-21 | 1994-02-22 | Miroslav Milinkovic | Mandrel for use in nickel vapour deposition processes and nickel molds made therefrom |
| IT1266029B1 (en) * | 1994-06-17 | 1996-12-16 | Unicem Spa | COMPOSITION OF CEMENT MORTAR AND ARTICLES OBTAINED FROM IT. |
| FR2729658B1 (en) * | 1995-01-25 | 1997-04-04 | Lafarge Nouveaux Materiaux | COMPOSITE CONCRETE |
| US5837313A (en) * | 1995-04-19 | 1998-11-17 | Schneider (Usa) Inc | Drug release stent coating process |
| IT1303210B1 (en) * | 1998-08-05 | 2000-11-02 | Stola Spa | PROCEDURE FOR THE CREATION OF A MOLD USABLE FOR INJECTION MOLDING OF PLASTIC COMPONENTS. |
| JP3839289B2 (en) * | 2001-09-20 | 2006-11-01 | 本田技研工業株式会社 | Concrete mold manufacturing method |
| BR0318457A (en) * | 2003-08-26 | 2006-09-12 | Ein Co Ltd Technical Ct | cushioned material formed of spring-structured resin molded product, manufacturing method for cushioned material, and mold used for fabrication thereof |
| FR2916992B1 (en) * | 2007-06-07 | 2010-02-12 | Armines | TOOLING USED IN A SUPERPLASTIC FORMING PROCESS |
| DE102007037701A1 (en) * | 2007-08-09 | 2009-02-12 | MAX BÖGL Fertigteilwerke GmbH & Co. KG | Mold and method of making a mold |
| DE102007042513A1 (en) * | 2007-09-07 | 2009-03-12 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method for and mold for the production of components, in particular made of fiber composites |
| FR2958576B1 (en) * | 2010-04-08 | 2012-06-15 | Armines | TOOLING USED FOR THE IMPLEMENTATION OF ORGANIC MATRIX COMPOSITES |
| DE102010060578A1 (en) * | 2010-11-16 | 2012-05-16 | Willi Lauber Gmbh | Tool half for a mold and method for its production |
| US8932518B2 (en) | 2012-02-29 | 2015-01-13 | General Electric Company | Mold and facecoat compositions |
| US9511417B2 (en) * | 2013-11-26 | 2016-12-06 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9528250B2 (en) * | 2014-09-30 | 2016-12-27 | Delta Faucet Company | Hose weight for a faucet |
| DE102015101685A1 (en) * | 2015-02-05 | 2016-08-11 | Krones Ag | Blow mold made of high-performance concrete and process for its production |
| DE102016103851A1 (en) * | 2016-03-03 | 2017-09-07 | Kmb Keramischer Modell- Und Formenbau Gmbh | Umform and / or Urformwerkzeug |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3229338A (en) * | 1965-03-31 | 1966-01-18 | Kopera Joseph | Manufacturing process for re-usable molds |
| DE2817339A1 (en) * | 1977-04-21 | 1978-11-02 | Morgan Thermic Sa | Refractory cement and its uses |
| JPS6126548A (en) * | 1984-07-17 | 1986-02-05 | 小松 茂富 | Electric resistance heater |
| AT380006B (en) * | 1984-07-19 | 1986-03-25 | Petschnig Ewald | MULTILAYERED INTRUSION PROTECTIVE BODY |
| US4780141A (en) * | 1986-08-08 | 1988-10-25 | Cemcom Corporation | Cementitious composite material containing metal fiber |
| US4915740A (en) * | 1986-09-25 | 1990-04-10 | Denki Kagaku Kogyo Kabushiki Kaisha | Hydraulic material composition having high strength |
| FR2640962A1 (en) * | 1988-12-26 | 1990-06-29 | Sogea | Composite concrete of very high performance and process for its use |
-
1990
- 1990-04-02 FR FR9004193A patent/FR2660237B1/en not_active Expired - Fee Related
-
1991
- 1991-03-25 EP EP91400796A patent/EP0451014A1/en not_active Withdrawn
- 1991-03-28 CA CA002039467A patent/CA2039467A1/en not_active Abandoned
- 1991-04-01 US US07/677,932 patent/US5188791A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0451014A1 (en) | 1991-10-09 |
| FR2660237B1 (en) | 1992-09-04 |
| FR2660237A1 (en) | 1991-10-04 |
| US5188791A (en) | 1993-02-23 |
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