Abstract: Ti, Mo, Cu and TiN were coated on diamond by the technology of magnetron sputtering. The compression strength of the diamond was measured. After diamond was taken heat treatment under vacuum condition, the surface structure of diamond was analyzed by XPS. The bonding states between cobalt-matrix and coated diamond havebeen studied using transverse rupture strength (TRS) testing, SEM and EDAX. Thecompression strength of the diamond could be increased by coatings. Only part of coated metal and diamond could be compound carbide and come into chemical bonding under hot-pressing condition of 830~840 ℃, which, however, have not greater effect to improve the binding strength. Mo-coated diamond could be rather impregnated by cobalt-matrix, and the binding strength between them has a greater increase.
Effect of coatings on binding capability between diamond and matrix
Abstract:
Ti, Mo, Cu and TiN were coated on diamond by the technology of magnetron sputtering. The compression strength of the diamond was measured. After diamond was taken heat treatment under vacuum condition, the surface structure of diamond was analyzed by XPS. The bonding states between cobalt matrix and coated diamond have been studied using transverse rupture strength (TRS) testing, SEM and EDAX. The compression strength of the diamond could be increased by coatings. Only part of coated metal and diamond could be compound carbide and come into chemical bonding under hot pressing condition of 830~840?℃, which, however, have not greater effect to improve the binding strength. Mo coated diamond could be rather impregnated by cobalt matrix, and the binding strength between them has a greater increase.[
Fig.2 Fracture morphologies of cobalt-matrix samples
(a) —Status of diamond surface in no-coated diamond samples; (b) —Binding status between matrix and Ti-coated diamond; (c) —Phenomenon of diamond rupture in Mo-coated diamond samples