Cubic boron nitride sintered material

Patent metadata

Field	Value
Publication number	US-11352298-B2
Application number	US-201917255550-A
Country	US
Kind code	B2
Filing date	Dec 16, 2019
Priority date	Dec 16, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

A cubic boron nitride sintered material includes: more than 80 volume % and less than 100 volume % of cubic boron nitride grains; and more than 0 volume % and less than 20 volume % of a binder phase. The binder phase includes: at least one selected from a group consisting of a simple substance, an alloy, and an intermetallic compound selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, aluminum, silicon, cobalt, and nickel. A dislocation density of the cubic boron nitride grains is more than or equal to 1×1015/m2 and less than or equal to 1×1017/m2.

First claim

The invention claimed is:

1. A cubic boron nitride sintered material comprising:
more than 80 volume % and less than 100 volume % of cubic boron nitride grains; and
more than 0 volume % and less than 20 volume % of a binder phase, wherein
the binder phase includes
at least one selected from a first group consisting of a material made of a single element, an alloy made of at least one element, and an intermetallic compound made of at least one element, the element being selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, aluminum, silicon, cobalt, and nickel, or
at least one selected from a second group consisting of (i) a compound composed of at least one element selected from the group consisting of the group 4 element, the group 5 element, the group 6 element in the periodic table, aluminum, silicon, cobalt, and nickel, and at least one element selected from a group consisting of nitrogen, carbon, boron, and oxygen, and (ii) a solid solution made of the compound, or
the at least one selected from the first group and the at least one selected from the second group, and

a dislocation density of the cubic boron nitride grains is more than or equal to 1×10 15 /m 2 and less than or equal to 1×10 17 /m 2 .

2. The cubic boron nitride sintered material according to claim 1 , wherein the dislocation density of the cubic boron nitride grains is more than or equal to 2×10 15 /m 2 and less than or equal to 6×10 16 /m 2 .

3. The cubic boron nitride sintered material according to claim 1 , wherein the dislocation density of the cubic boron nitride grains is more than or equal to 3×10 15 /m 2 and less than or equal to 1×10 16 /m 2 .

4. The cubic boron nitride sintered material according to claim 1 , wherein each of the cubic boron nitride grains contains more than or equal to 0.02 mass % and less than or equal to 0.2 mass % of calcium.

5. The cubic boron nitride sintered material according to claim 1 , wherein each of the cubic boron nitride grains contains more than or equal to 0.05 mass % and less than or equal to 0.17 mass % of calcium.

6. The cubic boron nitride sintered material according to claim 1 , wherein each of the cubic boron nitride grains contains more than or equal to 0.07 mass % and less than or equal to 0.15 mass % of calcium.

Assignees

• Sumitomo Electric Industries
• Sumitomo Electric Hardmetal Corp

Inventors

• Ishii Akito
• Okamura Katsumi
• Moroguchi Hironari
• Kukino Satoru

Classifications

• C22C2026/003

  Cubic boron nitrides only · CPC title

• C22C26/00

  Alloys containing diamond {or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes} · CPC title

• B22F2005/001

  Cutting tools, earth boring or grinding tool other than table ware · CPC title

• C22C2026/008

  with additional metal compounds other than carbides, borides or nitrides · CPC title

• B22F7/062

  involving the connection or repairing of preformed parts · CPC title