Patent ID: 11920222
Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A composite sintered material comprising: a plurality of diamond grains having an average grain size of less than or equal to 10 μm; a plurality of cubic boron nitride grains having an average grain size of less than or equal to 2 μm; a plurality of aluminum oxide grains having an average grain size of less than or equal to 0.5 μm; and a remainder of a binder phase, wherein
at least parts of adjacent diamond grains are bound to one another,
the binder phase includes cobalt,
in the composite sintered material, a content of the diamond grains is more than or equal to 30 volume % and less than or equal to 92 volume %, a content of the cubic boron nitride grains is more than or equal to 3 volume % and less than or equal to 40 volume %, a content of the aluminum oxide grains is more than or equal to 2 volume % and less than or equal to 15 volume %, and a content of the cobalt is more than or equal to 3 volume % and less than or equal to 30 volume %.