Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3912235 A
Publication typeGrant
Publication dateOct 14, 1975
Filing dateDec 19, 1974
Priority dateDec 19, 1974
Publication numberUS 3912235 A, US 3912235A, US-A-3912235, US3912235 A, US3912235A
InventorsJanssen Kenneth T
Original AssigneeUnited Technologies Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Multiblend powder mixing apparatus
US 3912235 A
Abstract  available in
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent 1191 Janssen Oct. 14, 1975 [5 MULTIBLEND POWDER MIXING 3,361,412 l/l968 Cole 259 4 APPARATUS 3,424,439 l/l969 Baker 259/4 3,462,130 8/1969 J0achim.... 259/4 [75] Inventor: .K nneth T. Janss n, Br k, 3,478,963 ll/l969 Winn 259 5 C011. 3,554,7l4 l/l97l JOhnSOn.... 259/4 3,593,735 7/1971 Reiher 259/4 [73] Asslgneel g Corpwatm, 3,623,704 11/1971 SkObel 259/4 a or onn.

[22] Filed: 1974 Primary ExaminerRobert W. Jenkins [21] A NO 1 534,339 Attorney, Agent, or Firm-Richard N. James [52] US. Cl 259/4; 259/7 511 lm. c1. B01F 15/02 [57] ABSIRACT [58] new of 259/4 Apparatus for delivering two or more metallic, ce-

259/18 ramic or plastic powders, at any given ratio, through a 61; 222/3; 23/252 R common manifold to thermal spray equipment permits [56] R f Cted the production of multiblend 0r graded coatings.

e erences 1 UNITED STATES PATENTS 8 Claims, 2 Drawing Figures 3,236,419 2/l966 Rerner 259/7 g 62 M /Z E E E E Z W 30 7% V .Z A V\ I, rm 16 7 2% 7 W /Z a i U.S. Patent Oct.14,1975 SheetlofZ 3,912,235

US. Patent Oct. 14, 1975 Sheet 2 of 2 &

MULTIBLEND POWDER MIXING APPARATUS BACKGROUND OF THE INVENTION The present invention relates to powder blending apparatus particularly for use with thermal spray equipment. As used herein, thermal spray techniques will be understood to make reference to either flame or plasma spray procedures.

In the generation of coatings by thermal spray techniques it is frequently desirable to provide coatings which are a blend of two or more distinct components. The characteristics of such components may be such that simple preblending in a single hopper is notfeasible, perhaps due to reactivity problems or difficulties in maintaining a uniform blend because of density or particle size differences. Furthermore, it is frequently desirable to provide a coating wherein the composition varies as a function of coating thickness. For example, it is known that ceramic coatings applied directly to metallic substrates often are unduly shocksensitive because of relative differences in thermal expansion between the metal substrates and the ceramic coatings.

In such instances it is desirable to provide a coating which varies, as a function of coating thickness, from metal adjacent the substrate to ceramic at its outer surface. For the above reasons and others, the use of a single source of premixed powder frequently is unsatisfactory in the generation of coatings by thermal spray techniques.

For the development of graded coatings, one alternative involves the use of multiple spraying guns, one gun being phased out while another or others are gradually phased in. Such a technique is disclosed in the US. Pat. No. 3,545,944 to Emmanuelson et al, of common assignee herewith. Such a technique, of course, involves multiple spraying guns.

Another alternative is the technique disclosed in Winzeler et al, US. Pat. No. 3,378,391 wherein multiple feed'lines from separate powder sources are fed into a spray gun of special design and mixed therein.

SUMMARY OF THE INVENTION The present invention relates to powder blending apparatus wherein two or more powders of distinct composition are blended and delivered in a common manifold to thermal spray equipment. In this apparatus powders from separate sources may be delivered into the system in any given ratio or sequence either at a constant rate or at a changing rate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a somewhat schematic representation of a preferred embodiment of the present invention.

FIG. 2 shows the powder manifold in greater detail.

DESCRIPTION OF THE PREFERRED EMBODIMENTS occurs. A blended powder mixture, typically carried by The principal motive power for the flow of powders from the respective feeders through the manifold to the gun, is provided by a high pressure gas flow. In the drawing, a source of high pressure argon (not shown) is utilized to charge a high pressure gas line 24 through shutoff valve 26. Four separate gas lines are tapped off line 24, specifically lines 30, 32, 34 and 36.

Gas line 30 normally feeds inert gas through a pressure regulator 40, flow meter 42, and normally open solenoid 44 through line 13 to manifold 14 to the gun 22, such as a plasma gun.

The gas lines 32, 34, and 36, which are also tapped off argon feeder line 24 provide a flow of gas through pressure regulators 50, 52 and 54, solenoid valves 56, 58 and 60, and flowmeters 62, 64 and 66. The flow of gas into the respective feeders entrains powders therein, dependent upon the rate of gas flow and therefrom to the gun as previously described.

In the equipment actually constructed, the three powder feeders 2, 4 and 6 were Mark IX Powder Feeders made by Sylvester & Co., Cleveland, Oh. The four pressure regulators 40, 50, 52 and 54 were 0-160 p.s.i. regulators obtained from Nordson Corp., Amherst, Oh. The flowmeters 42, 62, 64 and 66 were all identical and had a capacity of 030 cubic feet per hour. The cyclone mixer was procured from Sylvester and Co., and the spray gun 22 was a Plasmadyne 1068 Minigun.

The powder manifold 14 is shown in greater detail in FIG. 2. The manifold was provided with a central passageway 70 into which four subpassageways 72, 74, 76 and 78 extend at an angle of about 45. Four check valves 80, 82, 84 and 86, such as Parker Model VCL4P1, are connected to the subpassageways by four nipples 90, 92, 94 and 96. Flow through one or more of the subpassageways carrying inert gas and entrained powders from the respective powder feeders enters the central passageway and the gases and mixed powders exit the manifold through line 16.

The above described apparatus is capable of operation in various degrees of sophistication depending upon the desires of the user. In one mode of operation, all of the pressure regulators 40, 50, 52 and 54 are preset to provide desired levels of gas flow through regulators 42, 62, 64 and 66 which in turn regulate the powder amounts fed from the feeders 2, 4 and 6 into the manifold 14 and ultimately to the gun. Argon flow is established through the line 30 and normally open solenoid 44 and thence into the gun 22 without powder entrainment. A powder feed is then initiated closing solenoid 44 and opening one or more of the solenoids 56,

58 and 60. The solenoids 56, 58 and 60 may be all opened simultaneously or sequentially. Solenoid 56 may be programmed to open first, solenoids 58 and'60 remaining closed. Solenoid 58 may then be opened while solenoid 56 is closed, solenoid 60 remaining closed. The sequence may be further repeated with respect to the closing of solenoid 58 and the opening of solenoid 60.

In a further variation the solenoid phase in/phase out operation may be timed such that with solenoid 56 open and all others closed, solenoid 58 may be opened before solenoid 56 closes, providing powders from feeder 2 alone at first, then a mixture of powders from feeders 2 and 4, before solenoid 56 closes, at which time only powders from feeder 4 are provided. The same or different sequencing may be accomplished with the powders in feeders 4 and 6.

In another degree of refinement, the gas flows through the lines 32, 34 and 36 can also be varied during the time gas is flowing therethrough by variation of the settings of the regulators 50, 52 and 54. For example, when solenoid 44 is closed and solenoid 56 is opened, the pressure admitted through regulator 50 may gradually be increased or decreased by opening or closing regulator 50. This may be automatically programmed or may be a simple mechanical adjustment by the operator.

Whatever the sequencing employed in the system or degree of sophistication provided, a blend of powders is provided to the gun 22 through a single manifold, permitting the use of a single feed gun. When the valve sequencing is programmed for the operator he, therefore, need be concerned only with the application of the desired coating thickness, since composition of the coating is automatically controlled by the powder blending apparatus.

Powders admitted through various ports into the manifold 14 are prevented from backing into other ports by the check valves 80, 82, 84 and 86. When switching from one coating system to another, feeders 2, 4 and 6 may be cleaned and reused with the appropriate powders fed thereinto or, of course, substitute containers may be utilized. A gas purge may be utilized to clear the lines of the old powders and substitute feeders can be brought into the system by simply breakprises:

a pluralityof powder feeders each including means for storing powders, a gas inlet, and an outlet for discharging gas and entrained powders therefrom;

means for connecting the individual powder feeder gas inlets to a source of pressurized gas;

regulating means for controlling the gas flow through each connecting means; 1

a powder mixing manifold having a mixing chamber therein, a plurality of inlets to the mixing chamber, and an outlet from the mixing chamber;

entrained powder transmission means interconnecting, for each powder feeder, a powder feeder outlet and a mixing manifold inlet;

gun supply means for connecting the outlet of the mixing manifold to powder spraying apparatus; and

independent gas means for providing a regulated flow of gas from the gas source through the gun supply means, bypassing the powder feeders.

2. Apparatus according to claim 1 wherein:

the regulating means for controlling as flow includes a pressure regulator and a remotely-operable on/- off valve.

3. Apparatus according to claim 2 wherein:

the regulating means also includes a flowmeter.

4. Apparatus according to claim 2 wherein:

the independent gas means is connected between the gas source and an inlet to the powder mixing manifold.

5. Apparatus according to claim 4 wherein:

the independent gas means includes a pressure regulator and a remotely-operable on/off valve.

6. Apparatus according to claim 5 wherein:

the remotely-operable valve is a normally-open solenoid valve.

7. Apparatus according to claim 6 wherein:

the remotely-operable valve in the regulating means is a normally-closed solenoid valve.

8. Apparatus according to claim 1 wherein:

an additional gas/entrained powder mixing means is installed in the gun supply means.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3236419 *Feb 10, 1964Feb 22, 1966Continental Aviat & Eng CorpFoam dispenser
US3361412 *May 6, 1964Jan 2, 1968Austin ColeFoam mixing head
US3424439 *Nov 29, 1967Jan 28, 1969Bert BakerDevice for mixing and applying foams
US3462130 *Apr 26, 1968Aug 19, 1969Fuller CoMethod and apparatus for blending bulk solids
US3478963 *Sep 6, 1968Nov 18, 1969Archilithic CoDispensing gun for fiber rovings and cementitious materials
US3554714 *Jul 3, 1968Jan 12, 1971Modine Mfg CoAir-gas mixing device
US3593735 *Sep 4, 1968Jul 20, 1971Dick Evans IncMethod and apparatus for maintaining a preselected partial pressure
US3623704 *Aug 3, 1970Nov 30, 1971Dow CorningStatic mixing device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4101116 *Sep 27, 1976Jul 18, 1978Motan Gesellschaft Mit Beschrankter HaftungApparatus for mixing granulated and/or pulverous materials
US4696855 *Apr 28, 1986Sep 29, 1987United Technologies CorporationMultiple port plasma spray apparatus and method for providing sprayed abradable coatings
US4835022 *Jul 29, 1987May 30, 1989Utp Schweibmaterial Gmbh & Co. KgProcess and apparatus for coating components
US5362523 *Nov 23, 1992Nov 8, 1994Technalum Research, Inc.Method for the production of compositionally graded coatings by plasma spraying powders
US5879753 *Dec 19, 1997Mar 9, 1999United Technologies CorporationThermal spray coating process for rotor blade tips using a rotatable holding fixture
US6892764Jan 17, 2002May 17, 2005Eisenmann France SarlColor shade changing unit module for painting installation
US6908048Aug 1, 2002Jun 21, 2005Sames TechnologiesDevice for supplying a powdery coating product to a sprayer and spray installation comprising same
US6942161Oct 26, 2001Sep 13, 2005Asahi Sunac CorporationPainting machine for use with powder paint
US7712681Jun 3, 2005May 11, 2010Nordson CorporationColor change for powder coating material application system
US7763328Feb 20, 2007Jul 27, 2010Snecma ServicesMethod of depositing a thermal barrier by plasma torch
US8132743Mar 26, 2010Mar 13, 2012Nordson CorporationColor change for powder coating material application system
US8168261 *Mar 21, 2002May 1, 2012Sulzer Metco A.G.Process for applying a heat shielding coating system on a metallic substrate
US8337989May 17, 2010Dec 25, 2012United Technologies CorporationLayered thermal barrier coating with blended transition
US8449677Jun 16, 2010May 28, 2013SnecmaMethod of depositing a thermal barrier by plasma torch
US8574721Nov 12, 2012Nov 5, 2013United Technologies CorporationLayered thermal barrier coating with blended transition and method of application
US8662410 *Nov 3, 2005Mar 4, 2014GM Global Technology Operations LLCMultiple color powder paint application
US9067223Jan 18, 2012Jun 30, 2015Nordson CorporationColor change for powder coating material application system
US20030008167 *Mar 21, 2002Jan 9, 2003Michael LochProcess for applying a heat shielding coating system on a metallic substrate
US20040020535 *Aug 1, 2002Feb 5, 2004Michel Di GioiaDevice for supplying a powdery coating product to a sprayer and spray installation comprising same
US20040074545 *Jan 17, 2002Apr 22, 2004Jose RodriguesColour shade changing unit module for painting installation
US20050279860 *Jun 3, 2005Dec 22, 2005Fulkerson Terrence MColor change for powder coating material application system
US20060219807 *Jun 5, 2006Oct 5, 2006Fulkerson Terrence MColor changer for powder coating system with remote activation
US20070095852 *Nov 3, 2005May 3, 2007Murphy Christopher MMultiple color powder paint application
US20070196662 *Feb 20, 2007Aug 23, 2007Snecma ServicesMethod of depositing a thermal barrier by plasma torch
US20070253279 *Feb 17, 2004Nov 1, 2007Degussa AgHomogenisation of Nanoscale Powders
US20100104764 *Jan 4, 2010Apr 29, 2010Mohamed Youssef NazmyMethod of forming a ceramic thermal barrier coating
US20100176215 *Mar 26, 2010Jul 15, 2010Nordson CorporationColor change for powder coating material application system
US20100252539 *Jun 16, 2010Oct 7, 2010Snecma ServicesMethod of depositing a thermal barrier by plasma torch
US20110165335 *Mar 16, 2011Jul 7, 2011United Technologies CorporationDispersion strengthened rare earth stabilized zirconia
EP0229522A2 *Dec 23, 1986Jul 22, 1987National Aerospace Laboratories of Science & Technology AgencyA method of producing a functionally gradient material
EP0229522A3 *Dec 23, 1986Mar 16, 1988Nat Aerospace LabA method of producing a functionally gradient material
EP1160348A2 *May 21, 2001Dec 5, 2001Praxair S.T. Technology, Inc.Process for producing graded coated articles
EP1160348A3 *May 21, 2001Oct 29, 2003Praxair S.T. Technology, Inc.Process for producing graded coated articles
EP1206974A1 *Oct 31, 2001May 22, 2002Asahi Sunac CorporationPainting machine for use with powder paint
EP1821584A1 *Feb 20, 2007Aug 22, 2007Snecma ServicesMethod of depositing a thermal barrier by plasma torch
EP2674223A3 *Apr 11, 2013Aug 24, 2016Maschinenfabrik Reinhausen GmbHDevice and method for marking a substrate, as well as a marking therefor
EP2711441A1 *Sep 12, 2013Mar 26, 2014Reinhausen Plasma GmbHDevice and method for creating a coating system
WO1993005194A1 *Sep 2, 1992Mar 18, 1993Technalum Research, Inc.Method for the production of compositionally graded coatings
WO2002009886A1 *Aug 1, 2001Feb 7, 2002Sames TechnologiesDevice for supplying a powdery coating product to a sprayer and spray installation comprising same
WO2002057023A1 *Jan 17, 2002Jul 25, 2002Eisenmann France SarlColour shade changing unit module for painting installation
Classifications
U.S. Classification366/142, 118/311, 366/190
International ClassificationC23C4/12, B44D3/00, B01F3/00, B05B7/14, C23C4/02, B01F3/18, B05B12/00, H05H1/42, H05H1/26, B05B12/14
Cooperative ClassificationB44D3/003, C23C4/12, B01F3/18, C23C4/02, B05B7/1404, B05B12/14, H05H1/42
European ClassificationB01F3/18, B05B12/14, B44D3/00B, C23C4/12, H05H1/42, C23C4/02, B05B7/14A