DIAMOND-COATED HARD MEMBER HAVING REGULATED SURFACE ROUGHNESS

摘要

PROBLEM TO BE SOLVED: To provide a diamond-coated hard member, excellent in abrasion, peeling and chipping resistances and having a regulated surface roughness practicable especially as a cutting tool. SOLUTION: This diamond-coated hard member is obtained by coating the top surface of a substrate with a coating film of diamond and/or diamondlike carbon. The average surface roughness of the substrate adjacent to the coating film is regulated to 0.1-2.5μm expressed in terms of Ra and the average surface roughness of the coating film is regulated to <=1.5μm expressed in terms of the Ra . The diamond-coated hard member has the relationship of Ra (c)<=Ra (s) when the average surface roughness of the coating film is expressed as Ra (c) and that of the substrate is expressed as Ra (s). The Ra is in conformity to the contents of the description in the Japanese Industrial Standards JIS B0601.