Sintered material and method of producing same
AssigneeSumitomo Electric Industries, Ltd.
InventorsAkito ISHII, Katsumi OKAMURA
Life of this patent
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Abstract
A sintered material includes a first phase and a second phase, wherein the first phase is composed of cubic boron nitride particles, and the following relational expressions are satisfied when more than or equal to two cubic boron nitride particles adjacent to and in direct contact with each other among the cubic boron nitride particles are defined as a contact body, Di represents a length of an entire perimeter of the contact body, n represents the number of contact locations at which the cubic boron nitride particles are in direct contact with each other, dk represents a length of each of the contact locations, and Σdk (where k=1 to n) represents a total length of the contact locations: Dii=Di+(2×Σdk (where k=1 to n)); and [(Dii−Di)/Dii]×100≤50.
Claims8
A sintered material comprising a first phase and a second phase, wherein
- the first phase is composed of cubic boron nitride particles,
- the second phase is composed of a first material that is partially stabilized ZrO2 in which Al2O3 is dispersed in both or one of a crystal grain boundary and a crystal grain,
- the second phase is in contact with at least a portion of a surface of the first phase, and
- the following relational expressions (I) and (II) are satisfied when more than or equal to two cubic boron nitride particles adjacent to and in direct contact with each other among the cubic boron nitride particles are defined as a contact body, Di represents a length of an entire perimeter of the contact body, n represents the number of contact locations at which the cubic boron nitride particles are in direct contact with each other, dk represents a length of each of the contact locations, and Σdk represents a total length of the contact locations, where k=1 to n:
- Dii
- =
- Di
- +
- (
- 2
- ×
- ∑
- k
- =
- 1
- n
-
- d
- k
- )
- (
- I
- )
- [
- (
- Dii
- -
- Di
- )
- /
- Dii
- ]
- ×
- 100
- ≤
- 50
- (
- II
- )
A method of producing a sintered material including a first phase composed of cubic boron nitride particles and a second phase composed of a first material, the method comprising:
- a first step of obtaining a sintering precursor by coating the cubic boron nitride particles with the first material;
- and
- a second step of obtaining the sintered material by sintering the sintering precursor at a pressure of more than 1 GPa and less than or equal to 20 GPa, wherein
- the first material is partially stabilized ZrO2 in which Al2O3 is dispersed in both or one of a crystal grain boundary and a crystal grain.
Dependencies are inferred from the claim text.