Method for producing diamond coated member

A diamond coated member obtained by the process comprising the steps of:

• a first coating step in which a first diamond coating layer is directly deposited on and engaged with a part of a substrate having fine irregularities formed thereon by a gas phase synthesis method in which a mixed gas comprising 80 to 93 volume % hydrogen, 0 to 2 volume % methane and 7 to 20 volume % carbon monoxide is reacted to deposit said first diamond coating layer directly on said substrate so that substantially no voids are left between the fine irregularities and the first diamond coating and so that said fine irregularities are sufficiently deep to provide engagement between the first diamond coating layer and the substrate;
• and
• a second coating step in which a second diamond coating layer comprising diamond of a higher wear resistance than the first diamond coating layer is deposited on a surface of the first diamond coating layer.

A diamond coated member obtained by the process comprising the steps of:

• a first coating step in which a first diamond coating layer is directly deposited on and engaged with a part of a substrate having fine irregularities formed thereon by a gas phase synthesis method in which a mixed gas comprising 94 to 97 volume % hydrogen and 3 to 6 volume % carbon monoxide is reacted at a temperature of 800.degree. to 900.degree. C. to deposit said first diamond coating layer directly on said substrate so that substantially no voids are left between the fine irregularities and the first diamond coating and so that said fine irregularities are sufficiently deep to provide engagement between the first diamond coating layer and the substrate;
• and
• a second coating step in which a second diamond coating layer comprising diamond of a higher wear resistance than the first diamond coating layer is deposited on a surface of the first diamond coating layer.