POLYCRYSTALLINE DIAMOND BODY, CUTTING TOOL, WEAR-RESISTANT TOOL, GRINDING TOOL AND METHOD FOR PRODUCING POLYCRYSTALLINE DIAMOND BODY

摘要

A polycrystalline diamond body (10) contains diamond particles, the diamond particles have a mean particle size of 50 nm or less, and a crack initiation load is 10 N or more as measured in a fracture strength test by pressing a diamond indenter D with a tip radius Dr of 50 µm against a surface (10s) of the polycrystalline diamond body (10) at a load rate F of 100 N/min. Accordingly, a polycrystalline diamond body that is tough and has a small diamond particle size, a cutting tool, a wear-resistant tool, a grinding tool, and a method for producing the polycrystalline diamond body are provided.