Process for manufacturing a piston ring

Details Process for manufacturing a piston ring Process for manufacturing a piston ring

1995-06-05

1997-04-08

Beck, Shrive

Coating processes

Direct application of electrical, magnetic, wave, or...

Ion plating or implantation

427530, 427580, 20419216, B05D 306

Patent

active

056185901

ABSTRACT:
Using an arc ion plating apparatus, a metal not capable of forming a carbide or nitride, such as cobalt, nickel or molybdenum is set as a first target, a metal capable of forming a carbide or nitride, such as silicon, titanium, vanadium, chromium, iron, zirconium, niobium or tungsten is set as a second target and nitrogen, acetylene or methane is fed as a process gas to form a film on a piston ring body which is an article to be coated, thereby providing a piston ring comprising a hard film formed on at least its sliding outer face of the piston ring body, said hard film comprising a mixed structure formed of the metal not capable of forming a carbide or nitride and a carbide or nitride of the metal capable of forming a carbide or nitride. In this piston ring, the hard film has so good adhesion to the body material or film toughness that no cracking or film separation tend to occur even when the film is formed in a large thickness. The carbide or nitride in the hard film contributes the achievement of a superior wear resistance. Because of the fine structure of the hard film, the wear of the opposing material can be decreased, no film lubrication tends to be lost and the seizure resistance can be improved.

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