| 摘要 |
An improved diamond compact of the present invention comprises 20 to 85% by volume of diamond grains with a grain size of at least 3 mu m and the balance of a binder consisting of 20 to 95% by volume of ultra-fine diamond grains with a grain size of at most 1 mu m, at least one member with a grain size of at most 1 mu m, selected from the group consisting of carbides, carbonitrides, nitrides, borides of Group 4a, 5a and 6a elements of Periodic Table, solid solutions thereof and mixed crystals thereof and at least one member selected from the group consisting of iron group metals. |
