# US 11,111,182 B2 · Ceramic sintered body

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- Number: US 11,111,182 B2
- Document ID: US11111182B2
- Status: Granted
- Kind: B2
- Application number: 16/060,367
- Filed: 2016-11-25
- Published: 2018-12-20
- Granted: 2021-09-07
- Earliest claimed: 2015-12-07
- Assignees: Tungaloy Corporation
- Applicants: Tungaloy Corporation
- Inventors: Takashi Watanabe
- Web page: https://patentgrep.com/patent/US11111182B2

## CPC

- C04B 35/1115: {Minute sintered entities, e.g. sintered abrasive grains or shaped particles such as platelets (abrasives C09K3/14)}
- B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material
- C04B 35/119: with zirconium oxide
- C04B 35/48: based on zirconium or hafnium oxides, zirconates, {zircon} or hafnates
- C04B 35/4885: {with aluminium oxide}
- C04B 35/5626: {based on tungsten carbides}
- C04B 35/6261: {Milling}
- C04B 35/62625: {Wet mixtures}
- C04B 35/6455: {Hot isostatic pressing}
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3225: Yttrium oxide or oxide-forming salts thereof
- C04B 2235/3244: Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
- C04B 2235/3246: Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia
- C04B 2235/3847: Tungsten carbides
- C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron
- C04B 2235/5445: submicron sized, i.e. from 0,1 to 1 micron
- C04B 2235/5454: nanometer sized, i.e. below 100 nm
- C04B 2235/604: Pressing at temperatures other than sintering temperatures
- C04B 2235/6567: Treatment time
- C04B 2235/658: Atmosphere during thermal treatment
- C04B 2235/661: Multi-step sintering
- C04B 2235/762: Cubic symmetry, e.g. beta-SiC
- C04B 2235/765: Tetragonal symmetry
- C04B 2235/785: Submicron sized grains, i.e. from 0,1 to 1 micron
- C04B 2235/786: Micrometer sized grains, i.e. from 1 to 100 micron
- C04B 2235/80: Phases present in the sintered or melt-cast ceramic products other than the main phase
- 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
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)

## Abstract

A ceramic sintered body containing aluminum oxide, tungsten carbide and zirconium oxide, wherein: the zirconium oxide contains ZrO and ZrO2; the ZrO2 has a crystal structure or structures of one or two kinds selected from the group consisting of a tetragonal crystal structure and a cubic crystal structure; and when, in X-ray diffraction, regarding a peak intensity for a (111) plane of the ZrO as being denoted by I1, regarding a peak intensity for a (101) plane of ZrO2 having a tetragonal crystal structure as being denoted by I2t, and also regarding a peak intensity for a (111) plane of ZrO2 having a cubic crystal structure as being denoted by I2c, a ratio of I1 based on a total of I1, I2t and I2c [I1/(I1+I2t+I2c)] is from 0.05 or more to 0.90 or less.

## Claims

### Claim 1

A ceramic sintered body containing aluminum oxide, tungsten carbide and zirconium oxide, wherein:
the zirconium oxide contains ZrO and ZrO2;
the ZrO2 has a crystal structure or structures of one or two kinds selected from the group consisting of a tetragonal crystal structure and a cubic crystal structure;
based on a total content of the ceramic sintered body:
a content of the aluminum oxide is from 30 volume % or more to 74 volume % or less;
a content of the tungsten carbide is from 25 volume % or more to 69 volume % or less; and
a content of the zirconium oxide is from 1 volume % or more to 20 volume % or less; and
when, in X-ray diffraction, regarding a peak intensity for a (111) plane of the ZrO as being denoted by I1, regarding a peak intensity for a (101) plane of ZrO2 having a tetragonal crystal structure as being denoted by I2t, and also regarding a peak intensity for a (111) plane of ZrO2 having a cubic crystal structure as being denoted by I2c, a ratio of I1 based on a total of I1, I2t and I2c [I1/(I1+I2t+I2c)] is from 0.05 or more to 0.90 or less.

### Claim 2 (depends on 1)

The ceramic sintered body according to claim 1, wherein the ratio of I1 based on a total of I1, I2t and I2c [I1/(I1+I2t+I2c)] is from 0.20 or more to 0.80 or less.

### Claim 3 (depends on 1)

The ceramic sintered body according to claim 1, wherein:
the aluminum oxide is α-type aluminum oxide; and
when, in X-ray diffraction, regarding a peak intensity for a (110) plane of the α-type aluminum oxide as being denoted by I3, a ratio of a total of I2t and I2c based on I3 [(I2t+I2c)/I3] is from 0.30 or more to 4.00 or less.

### Claim 4 (depends on 1)

The ceramic sintered body according to claim 1, wherein an average particle size of the aluminum oxide is from 0.20 μm or more to 2.00 μm or less.

### Claim 5 (depends on 1)

The ceramic sintered body according to claim 1, wherein an average particle size of the tungsten carbide is from 0.10 μm or more to 1.50 μm or less.

### Claim 6 (depends on 2)

The ceramic sintered body according to claim 2, wherein:
the aluminum oxide is α-type aluminum oxide; and
when, in X-ray diffraction, regarding a peak intensity for a (110) plane of the α-type aluminum oxide as being denoted by I3, a ratio of a total of I2t and I2c based on I3 [(I2t+I2c)/I3] is from 0.30 or more to 4.00 or less.

### Claim 7 (depends on 6)

The ceramic sintered body according to claim 6, wherein an average particle size of the aluminum oxide is from 0.20 μm or more to 2.00 μm or less.

### Claim 8 (depends on 2)

The ceramic sintered body according to claim 2, wherein an average particle size of the aluminum oxide is from 0.20 μm or more to 2.00 μm or less.

### Claim 9 (depends on 3)

The ceramic sintered body according to claim 3, wherein an average particle size of the aluminum oxide is from 0.20 μm or more to 2.00 μm or less.

### Claim 10 (depends on 2)

The ceramic sintered body according to claim 2, wherein an average particle size of the tungsten carbide is from 0.10 μm or more to 1.50 μm or less.

### Claim 11 (depends on 3)

The ceramic sintered body according to claim 3, wherein an average particle size of the tungsten carbide is from 0.10 μm or more to 1.50 μm or less.

### Claim 12 (depends on 4)

The ceramic sintered body according to claim 4, wherein an average particle size of the tungsten carbide is from 0.10 μm or more to 1.50 μm or less.