# US 11,027,454 B2 · Method for producing ceramic sintered body, and method and device for producing ceramic molded body

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- Number: US 11,027,454 B2
- Document ID: US11027454B2
- Status: Granted
- Kind: B2
- Application number: 16/074,683
- Filed: 2017-02-02
- Published: 2019-02-21
- Granted: 2021-06-08
- Earliest claimed: 2016-02-05
- Assignees: Japan Fine Ceramics Center; Noritake Co., Limited; Toto Ltd.; NGK Insulators, Ltd.; Ngk Spark Plug Co., Ltd.
- Applicants: Japan Fine Ceramics Center; Noritake Co., Limited; Toto Ltd.; Ngk Insulators, Ltd.; Ngk Spark Plug Co., Ltd.
- Inventors: Teiichi Kimura; Satoshi Suehiro
- Web page: https://patentgrep.com/patent/US11027454B2

## CPC

- B28B 1/001: {Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material (selective deposition modelling of metallic powder B22F10/00; rapid manufacturing of 3D objects in general and in particular of plastics B29C64/00)}
- C04B 35/638: Removal thereof
- B28B 1/32: by projecting, e.g. spraying (spraying in general B05B, B05D)
- C04B 35/10: based on aluminium oxide
- C04B 35/111: Fine ceramics
- C04B 35/58: based on borides, nitrides, {i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides} or silicides {(containing free binder metal C22C29/00)}
- C04B 35/62218: {obtaining ceramic films, e.g. by using temporary supports}
- C04B 35/62222: {obtaining ceramic coatings (coating of mortars, concrete, artificial or natural stone or ceramics C04B41/45; laminated ceramic products B32B18/00; coating of glass C03C17/00, applying ceramic coatings on silicon for semi-conductor purposes H10W; coating metallic materials C23)}
- C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F})
- C04B 41/0036: {Laser treatment (working by laser beam B23K26/00)}
- C04B 41/009: {characterised by the material treated}
- C04B 41/4578: {Coating or impregnating of green ceramics or unset concrete}
- C04B 41/5001: {with carbon or carbonisable materials}
- C04B 41/5031: {Alumina}
- C04B 41/87: Ceramics
- C23C 24/085: {Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides}
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- 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 2235/60: Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B 2235/6026: Computer aided shaping, e.g. rapid prototyping
- C04B 2235/656: characterised by specific heating conditions during heat treatment
- C04B 2235/665: Local sintering, e.g. laser sintering
- Y02P 10/25: Process efficiency
- B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B)
- 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
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention is a sintering method of a ceramic for sintering characterized by forming a layer containing a carbon powder on a surface of an article consisting of a ceramic for sintering, and then irradiating with laser a surface of the carbon powder-containing layer of a lamination obtained.

## Claims

### Claim 1

A method for producing a ceramic compact on a substrate, the method comprising:
heating the substrate at a temperature ranging from 150° C. to less than 400° C. to prepare a heated substrate,
spraying a surface of the heated substrate with a slurry comprising a plurality of ceramic particles, a liquid dispersion medium, and a dispersant;
and volatilizing the liquid dispersion medium;
wherein a concentration of the ceramic particle in the slurry is from 20% to 40% by volume, and
wherein a content of the dispersant in the slurry is from 0.1 to 10 parts by volume based on 100 parts by volume of the ceramic particles.

### Claim 2 (depends on 1)

The method according to claim 1,
wherein the dispersion medium comprises a water or an alcohol.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the substrate is made of at least one material selected from the group consisting of a metal and a ceramic.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the ceramic particles have an average diameter of a range from 100 nm to 10 μm.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the slurry does not contain a polymer binder.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the resulting ceramic compact has a ceramic particle filling density of 85% or more based on bulk density.