IMPROVEMENT ON ADHESION STRENGTH OF DIAMOND FILM ON CEMENTED CARBIDE BY HEATED INTERMEDIATE LAYER

Recently, we have obtained good adhesion strength between diamond film and an ISO K-type insert, which is the most common type of cutting in serts for Al and Al-Si alloys, by heating the intermediate layer which is affixed to the insert. The heat treatment caused the migration of some metal component of the intermediate layer to the surface region a nd improved the adhesion strength between the diamond and the substrat e. The cutting life and performance of a diamond-coated ISO K-type ins ert with heat treatment of intermediate layer were equal to those of a polycrystalline diamond insert.