| 摘要 |
<p>A first element (10) adapted to selectively engage a second element (20), wherein the first element comprises a coating (12) and at least an engaging portion (14) of the first element is coated in said coating, wherein the coating is formed by vapour deposition to provide a thermo-chemically stable layer for temperatures up to 800°C. The coating (12) may comprise one or more of a nitride, oxide or carbide of titanium, chromium or aluminium.</p> |
