公开(公告)号：US3911891A

公开(公告)日：1975-10-14

申请号：US38771773

申请日：1973-08-13

Applicant: DOWELL ROBERT D

Inventor： DOWELL ROBERT D

IPC: B24C11/00 ,  C23C4/02 ,  C23C4/10 ,  F02B77/02 ,  F02F3/12

CPC classification number: F02B77/02 ,  B24C11/00 ,  C23C4/02 ,  C23C4/11 ,  F02F3/12 ,  F05C2201/021 ,  F05C2201/0448 ,  F05C2251/042

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 - 0.006 inches) comprised primarily of said nickel aluminum alloy and refractory zirconium oxide is deposited followed by the deposition of a still thicker layer (approximately 0.008 - 0.010 inches) primarily of zirconium oxide.