Patent ID: 11958782
Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 1:
2. The cubic boron nitride sintered material according to claim 1, wherein
the binder phase is composed of 10% by volume or more and 98% by volume or less of the aluminum oxide grains and 2% by volume or more and 90% by volume or less of first binder phase grains,
the first binder phase grains include one of or both
at least one selected from a second group consisting of a material made of a single element selected from a first group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum, silicon, iron, cobalt and nickel, and an alloy and an intermetallic compound each composed of two or more elements selected from the first group, and
at least one selected from a fourth group consisting of a first compound composed of at least one element selected from the first group and at least one element selected from a third group consisting of nitrogen, carbon, boron and oxygen, and a solid solution of the first compound, and

the first compound is free of aluminum oxide grains.