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US 2021/0198772 A1Published application
Cubic boron nitride sintered material and method for manufacturing the same
AssigneeSumitomo Electric Hardmetal Corp.
InventorsMachiko ABE, Satoru KUKINO, Michiko MATSUKAWA
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Abstract
A cubic boron nitride sintered material includes 40% by volume or more and 96% by volume or less of cubic boron nitride grains and 4% by volume or more and 60% by volume or less of a binder phase, and the cubic boron nitride grains have a dislocation density of less than 1×105/m2.
Claims3
1:
- A cubic boron nitride sintered material comprising 40% by volume or more and 96% by volume or less of cubic boron nitride grains and 4% by volume or more and 60% by volume or less of a binder phase,
- the cubic boron nitride grains having a dislocation density of less than 1×105/m2.
2:
- The cubic boron nitride sintered material according to claim 1, wherein the binder phase includes:
- at least one selected from the group consisting of:
- a simple substance selected from the group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum, silicon, cobalt and nickel;
- an alloy thereof;
- and an intermetallic compound thereof;
- at least one selected from the group consisting of:
- a compound consisting of at least one element selected from the group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum, silicon, cobalt and nickel, and at least one element selected from the group consisting of nitrogen, carbon, boron and oxygen;
- and a solid solution derived from the compound;
- or
- at least one selected from the group consisting of a simple substance selected from the group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum, silicon, cobalt and nickel, an alloy thereof, and an intermetallic compound thereof;
- and at least one selected from the group consisting of a compound consisting of at least one element selected from the group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum, silicon, cobalt and nickel and at least one element selected from the group consisting of nitrogen, carbon, boron and oxygen, and a solid solution derived from the compound.
8 more elements
3:
- A method for manufacturing a cubic boron nitride sintered material according to claim 1, comprising:
- preparing hexagonal boron nitride powder and binder powder;
- and
- heating and pressurizing the hexagonal boron nitride powder and the binder powder to a temperature of 1900° C. or higher and 2400° C. or lower and a pressure of 8 GPa or larger through a temperature and a pressure in a stable region of wurtzite boron nitride,
- the stable region of wurtzite boron nitride simultaneously satisfying Formulae 1 and 2:
- P≥−0.0037T+11.301, and Formula 1:
- P≤−0.085T+117, Formula 2:
- where T represents temperature in ° C. and P represents pressure in GPa,
- the heating and pressurizing step being performed along a route entering the stable region of wurtzite boron nitride at a temperature of 600° C. or higher.
6 more elements