DIAMOND SINTERED COMPACT AND ITS PRODUCTION

摘要

PURPOSE: To produce a diamond sintered compact having heat, chipping and wear resistances under conditions capable of industrial production. CONSTITUTION: This diamond sintered compact consists of 0.1-30vol.% material made of a compd. contg. an alkali metal or an alkaline earth metal and phosphorus and the balance diamond. Phosphate hydrate, hydrogenphosphate or hydrogenphosphate hydrate of the alkali metal or alkaline earth metal is used as a sintering aid, powder of the sintering aid is mixed with diamond powder, non-diamond carbon powder or a mixture of them and the resultant mixture is sintered by holding under conditions of pressure and temp. in a region in which diamond is thermodynamically stable.