Claims
- 1. A process for manufacturing a piston ring, comprising:
- (a) causing an arc discharge in a process gas atmosphere comprised of nitrogen or carbon as a component element, using as a cathode a target comprised of (i) a metal selected from the group consisting of cobalt and nickel and (ii) a metal selected from the group consisting of silicon, titanium, vanadium, chromium, iron, zirconium, niobium and tungsten, wherein the cobalt or nickel is applied to the piston ring without forming a carbide or nitride and wherein the metal selected from the group consisting of silicon, titanium, vanadium, chromium, iron, zirconium, niobium and tungsten is applied to the piston ring as a nitride or a carbide, to release metal ions from said target; and
- (b) applying a bias voltage to a piston ring body to bring said metal ions together with particles of the process gas, into adhesion to a surface of the piston ring body to form a film coating thereon.
- 2. The process according to claim 1, wherein said process gas is selected from the group consisting of nitrogen, acetylene and methane.
- 3. The process according to claim 1, wherein, after said film has been formed, nitriding is carried out.
- 4. The process according to claim 2, wherein said bias voltage is 50 volts.
- 5. The process according to claim 2, wherein the film has a thickness of 15 to 70 .mu.m.
- 6. The process according to claim 5, wherein the piston ring body is made of cast iron.
- 7. The process according to claim 5, wherein the piston ring body is made of steel.
- 8. The process according to claim 2, wherein the arc discharge is carried out in a vacuum of 1.3.times.10.sup.-3 Torr or less.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-268791 |
Sep 1991 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 07/943,289 filed Sep. 10, 1992, now abandoned.
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Divisions (1)
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Number |
Date |
Country |
Parent |
943289 |
Sep 1992 |
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