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Publication numberUS20030075251 A1
Publication typeApplication
Application numberUS 10/168,011
PCT numberPCT/SE2000/002572
Publication dateApr 24, 2003
Filing dateDec 18, 2000
Priority dateDec 20, 1999
Also published asCA2394025A1, CN1241703C, CN1411427A, DE60013322D1, DE60013322T2, EP1242333A1, EP1242333B1, US7449045, US20070113706, WO2001046082A1
Publication number10168011, 168011, PCT/2000/2572, PCT/SE/0/002572, PCT/SE/0/02572, PCT/SE/2000/002572, PCT/SE/2000/02572, PCT/SE0/002572, PCT/SE0/02572, PCT/SE0002572, PCT/SE002572, PCT/SE2000/002572, PCT/SE2000/02572, PCT/SE2000002572, PCT/SE200002572, US 2003/0075251 A1, US 2003/075251 A1, US 20030075251 A1, US 20030075251A1, US 2003075251 A1, US 2003075251A1, US-A1-20030075251, US-A1-2003075251, US2003/0075251A1, US2003/075251A1, US20030075251 A1, US20030075251A1, US2003075251 A1, US2003075251A1
InventorsMats Sundberg, Jan-Olof Olsson, Chet Popilowski
Original AssigneeMats Sundberg, Jan-Olof Olsson, Chet Popilowski
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of handling liquid non-ferrous metals with refractory material
US 20030075251 A1
Abstract
A method of handling liquid non-ferrous metals in which the liquid metal is treated while coming into contact with a solid refractory material. The invention is characterised in that the solid material is Ti3SiC2. According to one preferred embodiment, the liquid material is aluminium or aluminium alloys.
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Claims(4)
1. A method of handling liquid non-ferrous metals, in which the liquid metal is treated while coming into contact with a solid refractory material, characterised in that the solid material is Ti3SiC2.
2. A method according to claim 1, characterised in that the liquid material is aluminium or aluminium alloys.
3. A method according to claim 1 or 2, characterised in that the liquid material is magnesium or magnesium alloys.
4. A method according to claim 1 or 2, characterised in that said treatment includes melting, retaining, transporting, filtering or casting the liquid material.
Description
  • [0001]
    The present invention relates to a method of handling liquid non-ferrous metals, and more specifically to the solid material with which the liquid material comes into contact.
  • [0002]
    There is a need for refractory material that can resist the aggressive conditions that occur when the material comes into contact with liquid non-ferrous metals, such as aluminium. Among other things, this need is due to the increasing use of aluminium in vehicle parts, such as chassis and cast engine parts. Material that shall be used in direct contact with liquid aluminium must possess good corrosion properties and good erosion properties and also have a high resistance to oxidation at high temperatures and against thermal shocks, and shall also have high impact resistance and high strength and hardness. The material shall also be capable of being easily worked into complex shapes at a competitive cost.
  • [0003]
    The aluminium industry uses at present silicon aluminium oxynitride, SIALON, despite its high manufacturing costs. One drawback with SIALON, however, is that it is brittle and therefore expensive to work.
  • [0004]
    SiC and Si3N4 are materials that have also been evaluated in contact with liquid aluminium. It was found that Si dissolved into liquid aluminium in both cases. Si3N4 was found to have the best resistance to corrosion when produced by hot isostatic pressing (HIP) of reaction-bound Si3N4 (HIPRBSN).
  • [0005]
    A dense protective layer was formed from AIN. SiC has been found to have low corrosion resistance when the material is manufactured by using silicon metal as a binding phase. Brittleness, difficulties in mechanical working, poor resistance against thermal shocks, low impact resistance, and reactions with liquid aluminium are among the drawbacks exhibited by SiC when used with liquid aluminium.
  • [0006]
    Generally speaking, the high affinity of Al to Si and the high solubility of Si in Al normally results in Si dissolving in liquid aluminium.
  • [0007]
    Some metallic materials, such as cast iron, have normally been used in conjunction with liquid aluminium, because these metals are inexpensive, have high mechanical strength and resist thermal shocks. Cast iron protective pipes, however, are wetted by liquid aluminium, resulting in dissolving of the material with subsequent contamination of the melt with undesirable iron particles.
  • [0008]
    The aforesaid problems are solved by the present invention.
  • [0009]
    The present invention thus relates to a method of handling liquid non-ferrous metals, in which the liquid metal is treated as it comes into contact with a solid refractory material, said method being characterised in that the solid material is Ti3SiC2.
  • [0010]
    It has surprisingly and unexpectedly been found that this material is stable in liquid aluminium. It has been found that when in contact with liquid aluminium there is formed on the surface of the material a reaction zone which produces a layer that passivates the outer surface of said material and which prevents chemical corrosion in all essentials.
  • [0011]
    The material has therefore been found excellent in respect of handling liquid aluminium and aluminium alloys.
  • [0012]
    The material Ti3SiC2 has a unique combination of properties that render it suitable for high temperature applications. It has very good working properties, which enable complicated shapes to be produced. The material is also insensitive to thermal shocks. Ti3SiC2 is also a material that has high impact resistance and an equilibrium temperature between brittle and tough material of about 1200 C. The thermal conductivity of the material is about 37 W/mK at room temperature. The material can be produced by conventional methods of producing ceramic materials, such as extrusion, cold isostatic pressing (CIPing), casting and packing by pressureless sintering, or by hot isostatic pressing (HIP). Minor fractions of TiC, SiC and TiSi2 may be present in the finished material. The above mentioned treatment of the liquid material includes melting, retaining, such as when alloying, transportation, filtration, such as when degassing and purifying the material, or casting of the liquid material.
  • [0013]
    Aluminium has been mentioned above. According to a preferred embodiment, the liquid material is magnesium or magnesium alloys instead.
  • [0014]
    It is also conceivable to use successfully said material for other metals or metal alloys that have a relatively low melting point. Zinc, copper, tin and lead or their alloys are primarily intended in this respect.
  • [0015]
    The present invention is therefore not restricted to liquid material in the form of aluminium or magnesium, but can be applied with respect to other materials in which the material Ti3SiC2 is stable.
  • [0016]
    It will therefore be understood that the present invention is not restricted to the aforedescribed embodiments thereof but variations can be made within the scope of the accompanying Claims.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US5882561 *Nov 22, 1996Mar 16, 1999Drexel UniversityProcess for making a dense ceramic workpiece
US6312570 *Feb 8, 2000Nov 6, 2001Advanced Refractory Technologies, Inc.Materials for use in electrochemical smelting of metals from ore
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7217907Oct 22, 2004May 15, 20073-One-2 LlcStick resistant cooking utensils
US20050112414 *Oct 22, 2004May 26, 2005Tamer El-RaghyStick resistant cooking utensils
Classifications
U.S. Classification148/688, 501/99, 266/280, 266/44
International ClassificationB22D21/04, C22B9/16, B22D41/02, C04B35/565, C04B35/56, F27D1/00
Cooperative ClassificationC04B35/5615
European ClassificationC04B35/56H2D
Legal Events
DateCodeEventDescription
Oct 11, 2002ASAssignment
Owner name: DREXEL UNIVERSITY, PENNSYLVANIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SUNDBERG, MATS;OLSSON, JAN-OLOF;POPILOWSKI, CHET;REEL/FRAME:013796/0134;SIGNING DATES FROM 20020608 TO 20020813
Owner name: SANDVIK AB, SWEDEN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SUNDBERG, MATS;OLSSON, JAN-OLOF;POPILOWSKI, CHET;REEL/FRAME:013796/0134;SIGNING DATES FROM 20020608 TO 20020813
May 31, 2005ASAssignment
Owner name: SANDVIK INTELLECTUAL PROPERTY HB, SWEDEN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SANDVIK AB;REEL/FRAME:016290/0628
Effective date: 20050516
Owner name: SANDVIK INTELLECTUAL PROPERTY HB,SWEDEN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SANDVIK AB;REEL/FRAME:016290/0628
Effective date: 20050516
Jun 30, 2005ASAssignment
Owner name: SANDVIK INTELLECTUAL PROPERTY AKTIEBOLAG, SWEDEN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SANDVIK INTELLECTUAL PROPERTY HB;REEL/FRAME:016621/0366
Effective date: 20050630
Owner name: SANDVIK INTELLECTUAL PROPERTY AKTIEBOLAG,SWEDEN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SANDVIK INTELLECTUAL PROPERTY HB;REEL/FRAME:016621/0366
Effective date: 20050630