Coating processes – Spray coating utilizing flame or plasma heat – Continuous feed solid coating material
Patent
1996-06-21
1999-09-28
Bareford, Katherine A.
Coating processes
Spray coating utilizing flame or plasma heat
Continuous feed solid coating material
427453, 427454, 427455, 427456, 219 7612, 219 7614, 219 7616, C23C 406, C23C 416
Patent
active
059585218
ABSTRACT:
A method of thermally spraying a coating onto the interior of a cylindrical surface which coating is graded between enhanced optimal machinability and enhanced wear resistance. The method comprises the steps of; (a) preparing a cylindrical bore surface of a light metal substrate cleansed of grease and oils and modified to alter any oxide film present thereon; (b) thermally spraying a deposit of metallic droplets or particles onto the prepared bore surface using metal wire or powder feedstocks (low carbon steel or stainless steel) and a primary atomizing gas that projects the droplets or particles as a spray, the droplets or particles having a chemistry capable of metallurgically bonding with the metal of the substrate, the spray being positioned to lay down a generally uniform coating of such droplets or particles; and (c) varying the chemical content of the atomizing gas in two or more stages to proceed from essentially a metal droplet oxide-forming gas (air or oxygen) to essentially an inert or non-oxidizing gas (nitrogen or argon) relative to the droplets or particles.
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Joaquin Armando M.
Popoola Oludele O.
Zaluzec Matthew J.
Bareford Katherine A.
Ford Global Technologies Inc.
Malleck Joseph W.
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