| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve seat film forming method, and a valve seat film for easily increasing the thickness of the valve seat film, and ensuring sufficient bonding strength at an interface between a valve seat portion and the valve seat film. SOLUTION: A metallic film 11 consisting mainly of copper is formed on a valve seat portion 7 by using a green compact electrode 1 for forming the valve seat film consisting mainly of copper producing less carbide to cause a factor for impairing the increase of the film thickness. In addition, a metallic film 12 mainly consisting of titanium carbide of excellent heat resistance and wear resistance is formed by using a green compact electrode 1' for forming the valve seat film consisting mainly of titanium. A valve seat film 13 comprises these metallic films 11 and 12. The thickness of the valve seat film 13 is increased by increasing the thickness of the copper film 11, and the heat resistance and the wear resistance are ensured by forming an outermost layer of the metal film 12 consisting mainly of titanium carbide. COPYRIGHT: (C)2004,JPO
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