Robert Lewis Dowell

US Patent:

39768090, Aug 24, 1976

Filed:

Jun 30, 1975

Appl. No.:

5/591537

Inventors:

Robert D. Dowell - Torrance CA

International Classification:

F02F 312
F02F 302
B05D 108

US Classification:

427 34

Abstract:

A coating is disclosed herein together with a method of forming that coating on metal surfaces of an internal combustion chamber. The coating is deposited for example, on the combustion surface of a piston to form a thermal barrier and thus enable higher temperatures to be sustained within the chamber. Combustion at higher temperatures achieves a more complete fuel burning thus increasing performance and reducing emissions. The coating is formed on the combustion surface by successively depositing layers of different materials preferably applied utilizing a plasma flame spray process. More particularly, the formation of the coating on the combustion surface involves preparing the surface as by grit blasting and then initially depositing a thin (approximately 0. 001 - 0. 003 inches) nickel aluminum alloy layer. Thereafter, a second thicker layer (approximately 0. 003 - 0.