| 摘要 |
PROBLEM TO BE SOLVED: To improve durability under highly loading by coating a rigid carbon film (a diamond-like carbon film) on the surface of a steel base metal by putting a WC film between them. SOLUTION: At first a WC film 2 is formed on a surface of a steel base material 1, and a rigid carbon film 3 is formed on the WC film 2. The steel base metal is martensitic stainless steel, precipitation hardening stainless steel or SUJ2, M50, etc., and the WC film 2 is formed by using, for example, a magnetron sputtering apparatus. Further, the rigid carbon film 3 is formed by an ion plating method wherein, for example, hydrocarbon gas is introduced into a vacuum vessel, d.c. voltage is impressed between two poles of electrodes to generate glow discharge, and coating treatment is carried out under the discharge. When the WC film is made to lie as an intermediate layer between the rigid carbon film 3 and the steel base metal 1, adhesion is improved. |
