DIAMOND SINTERED COMPACT AND PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To obtain a diamond sintered compact having chipping-off property, heat resistance and acid resistance and also enabling to produce it under such conditions as capable of industrial production and its production method. SOLUTION: This diamond sintered compact contains 0.1-30 volume % substance consisting of alkaline earth metal and a compound containing silicon and oxygen and the balance diamond. Silicate of alkaline earth metal is used as a sintering auxiliary, and this powder is mixed with diamond powder or nondiamond carbon powder or mixed powder of diamond with nondiamond carbon, kept under the condition of pressure and temperature in the thermodynamically stable region and sintered to produce the diamond sintered compact.