DIAMOND SINTER AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: A diamond sinter is provided to have an excellent hardness for being used as a material for cutting tool with an inexpensive cost. CONSTITUTION: A diamond sinter is formed by:a cemented carbide substrate of the WC-Co system with irregularity; the diamond sinter being bonded to the one side of the substrate in a sinter process of a super high pressure and a super high temperature; a thickness of the plate for over 0.5 millimeter and under 5 millimeters; an outer circumference over 20 millimeters; over 0.05 millimeter and under 0.4 millimeter of the thickness of the sinter occupying more than 50% of the whole area; and the diamond sinter layer including the Co dissolved from the cemented carbide substrate as a combining agent. Herein, the fineness of the diamond particle is over 0.1 micrometer and under 60 micrometers and is formed by the diamond being combined by 85 ¯ 99 wt% of the diamond sinter.