# US 10,118,302 B2 · Ceramic cutting tool

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- Number: US 10,118,302 B2
- Document ID: US10118302B2
- Status: Granted
- Kind: B2
- Application number: 15/556,629
- Filed: 2016-05-25
- Published: 2018-03-01
- Granted: 2018-11-06
- Earliest claimed: 2015-05-25
- Assignees: KYOCERA Corporation
- Applicants: Kyocera Corporation
- Inventors: Takanori Nishihara
- Web page: https://patentgrep.com/patent/US10118302B2

## CPC

- B26B 9/02: characterised by the shape of the cutting edge, e.g. wavy
- B26B 9/00: Blades for hand knives
- C04B 35/119: with zirconium oxide
- C04B 35/486: Fine ceramics
- C04B 35/488: Composites
- C04B 35/4885: {with aluminium oxide}
- C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F})
- C04B 35/6455: {Hot isostatic pressing}
- C04B 41/0036: {Laser treatment (working by laser beam B23K26/00)}
- 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 2235/3826: Silicon carbides
- C04B 2235/3873: Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
- 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 2235/96: Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- B26B: HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR (for harvesting A01D; for horticulture, for forestry A01G; for butchering or meat treatment A22; for manufactering or repairing footwear A43D; nail clippers or cutters A45D29/02; kitchen equipment A47J; {vegetable slicers, julienne cutters and similar devices and holders therefor, B26D3/28}; for surgical purposes A61B; for metal B23D; cutting by abrasive fluid jets B24C5/02; plier-like tools with cutting edges B25B7/22; pincers B25C11/02; handles for hand implements, in general B25G; guillotine-type cutters B26D; {perforating by non-mechanical means, e.g. by fluid jet, B26F1/26}; for erasing B43L19/00; for textile materials D06H)
- 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

Provided is a ceramic cutting tool including a blade body containing zirconium oxide as a primary component, the blade body containing particles containing any one of aluminum oxide, silicon carbide, or silicon nitride as a primary component.

## Claims

### Claim 1

A ceramic cutting tool comprising a blade body containing zirconium oxide as a primary component of the blade body, wherein the blade body contains particles containing any one of aluminum oxide, silicon carbide, or silicon nitride as a primary component of the particles, and wherein the blade body includes a blade part, and a plurality of the particles are exposed on a top part of the blade part, and a width of the top part is not less than 1 μm and not greater than 10 μm.

### Claim 2 (depends on 1)

The ceramic cutting tool according to claim 1, wherein the particles contain aluminum oxide as the primary component of the particles.

### Claim 3 (depends on 1)

The ceramic cutting tool according to claim 1, wherein an average particle size of the particles is not less than 10 nm and not greater than 400 nm.

### Claim 4 (depends on 1)

The ceramic cutting tool according to claim 1, wherein the blade body contains the particles in an amount of not less than 5 vol. % and less than 50 vol. %.

### Claim 5 (depends on 1)

The ceramic cutting tool according to claim 1, wherein the blade body further comprises markings on a surface thereof, and the markings have a lower light reflectance than other portions of the blade body.