Diamond-coated member and process for the preparation thereof

Details Diamond-coated member and process for the preparation thereof Diamond-coated member and process for the preparation thereof

C - Chemistry, Metallurgy

23

C

117/157, 117/74,

C23C 16/00 (2006.01) C23C 14/06 (2006.01) C23C 14/58 (2006.01) C23C 16/02 (2006.01) C23C 16/26 (2006.01) C23C 16/27 (2006.01) C23C 16/30 (2006.01) C23C 16/56 (2006.01) C30B 25/02 (2006.01)

Patent

CA 2029873

ABSTRACT The present invention relates to a diamond-coated member characterized by superposing an acicular diamond layer, an intermediate layer formed by a metal belonging to either of the group IIIb, IVa, Va or VIa of the periodic table or by a compound containing the said metal, Si or B, and a non-acicular diamond layer on the surface of a base material and to a process for the preparation of a diamond-coated member characterized in that a diamond layer is formed on the surface of a base material by vapor phase synthesis method; the resulting diamond layer is converted into acicular diamond by exposing the resulting diamond layer to a gas obtainable by exciting an oxygen-containing etching gas; an intermediate layer comprising a metal belonging to either of the group IIIb, IVa, Va or VIa of the periodic table or by a compound containing the said metal, Si or B is formed on the resulting acicular diamond; and the resulting intermediate layer is exposed to a gas obtainable by exciting a raw material gas containing a carbon source gas. The diamond-coated member according to the present invention is useful as cutting tools and abrasion resistant members.

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