# US 10,245,643 B2 · Sintered body

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- Number: US 10,245,643 B2
- Document ID: US10245643B2
- Status: Granted
- Kind: B2
- Application number: 15/520,948
- Filed: 2015-10-14
- Published: 2017-11-30
- Granted: 2019-04-02
- Earliest claimed: 2014-10-23
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Kentaro Chihara; Hironari Moroguchi; Takashi Harada; Satoru Kukino
- Web page: https://patentgrep.com/patent/US10245643B2

## CPC

- B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material
- C01B 21/082: Compounds containing nitrogen and non-metals {and optionally metals}(C01B21/06, C01B21/08 take precedence)
- C04B 35/5831: based on cubic boron nitrides {or Wurtzitic boron nitrides, including crystal structure transformation of powder}
- C04B 35/597: based on silicon oxynitride, {e.g. SIALONS}
- C04B 35/626: Preparing or treating the powders individually or as batches {(pigments for ceramics C09C1/0009); preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B}
- C04B 35/62836: {Nitrides}
- C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F})
- C04B 35/645: Pressure sintering
- C04B 2235/386: Boron nitrides
- C04B 2235/3873: Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A sintered body includes a first hard particle, a second hard particle, and a binder. The first hard particle is an M sialon particle having a coating layer. The M sialon particle is represented by MxSi(6−x−z)AlzOzN(8−z) (in the formula, M is a metal containing at least one selected from the group consisting of calcium, strontium, barium, scandium, yttrium, lanthanoid, manganese, iron, cobalt, nickel, copper, and group IV, group V, and group VI elements of the periodic table, and relationships of 0.01≤x≤2, 0.01≤z≤4.2, and 1.79≤(6−x−z)≤5.98 are satisfied). The second hard particle is a cubic boron nitride particle.

## Claims

### Claim 1

A sintered body comprising a first hard particle; a second hard particle; and a binder,
wherein the first hard particle is an M sialon particle having a coating layer, the M sialon particle is represented by MxSi(6−x−z)AlzOzN(8−z) (in the formula, M is a metal containing at least one selected from the group consisting of calcium, strontium, barium, scandium, yttrium, lanthanoid, manganese, iron, cobalt, nickel, copper, and group IV, group V, and group VI elements of the periodic table, and relationships of 0.01≤x≤2, 0.01≤z≤4.2, and 1.79≤(6−x−z)≤5.98 are satisfied), and
the second hard particle is a cubic boron nitride particle.

### Claim 2 (depends on 1)

The sintered body according to claim 1, having a thermal conductivity of 5 W/m·K or more and 60 W/m·K or less.

### Claim 3 (depends on 1)

The sintered body according to claim 1 , wherein the M sialon particle contains at least cubic M sialon.

### Claim 4 (depends on 1)

The sintered body according to claim 1, wherein the coating layer contains at least one of nitrides and carbonitrides of at least one element selected from the group consisting of Ti, Zr, Cr, and Al.

### Claim 5 (depends on 1)

The sintered body according to claim 1, wherein the coating layer has a thickness of 0.01 μm or more and 2 μm or less.

### Claim 6 (depends on 1)

The sintered body according to claim 1, wherein a ratio of a volume of the second hard particle to a volume of the first hard particle is 0.5 or more and 7 or less.

### Claim 7 (depends on 1)

The sintered body according to claim 1, wherein a ratio of an intensity of a main peak of X-ray diffraction of SiO2 to a total of intensities of main peaks of X-ray diffraction of α-M sialon, β-M sialon, cubic M sialon, and SiO2 that are contained in the sintered body is 0.3 or less.

### Claim 8 (depends on 1)

The sintered body according to claim 1, wherein a ratio of an intensity of a main peak of X-ray diffraction of cubic M sialon to a total of intensities of main peaks of X-ray diffraction of α-M sialon, β-M sialon, and cubic M sialon that are contained in the M sialon particle is 0.2 or more.

### Claim 9 (depends on 1)

The sintered body according to claim 1, wherein the binder contains at least one element selected from the group consisting of Ti, Zr, Al, Ni, and Co and/or at least one of nitrides, carbides, oxides, and carbonitrides of the elements, and solid solutions thereof.

### Claim 10 (depends on 1)

The sintered body according to claim 1, wherein a total content of the first hard particle and the second hard particle in the sintered body is 60% by volume or more and 90% by volume or less.

### Claim 11 (depends on 1)

The sintered body according to claim 1, having a Vickers hardness of 22 GPa or more.

### Claim 12 (depends on 1)

A cutting tool comprising the sintered body according to claim 1.