Coating processes – Spray coating utilizing flame or plasma heat
Patent
1992-11-23
1994-11-08
Owens, Terry J.
Coating processes
Spray coating utilizing flame or plasma heat
427454, 427456, 428610, C23C 412, B05D 112
Patent
active
053625234
ABSTRACT:
The method for preparing a coating with a continuous compositional gradient includes introducing at least first and second powders into a plasma torch at separately controllable variable feed rates for each powder and co-depositing the at least first and second powders on the substrate and adjusting the relative feed rates of the first and second powders such that a smooth continuous compositional grading is achieved in the coating. The compositional gradient can follow a linear, exponential or variable function. A sublayer may be deposited onto the substrate prior to deposition of the compositionally graded layer. Additional materials that impart other desirable properties to the layer can be added with the layer or applied after deposition of the layer. Choice of atmosphere during deposition include vacuum, inert atmosphere, and oxidizing, carburizing and boriding atmospheres.
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Farmakovsky Boris V.
Gorynin Igor V.
Kalogina Karina V.
Khinsky Alexander P.
Riviere Alfredo V.
Owens Terry J.
Technalum Research, Inc.
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