Titanium carbonitride powder and method for manufacturing titanium carbonitride powder

Patent metadata

Field	Value
Publication number	US-11225412-B2
Application number	US-201716324922-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Aug 22, 2016
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A titanium carbonitride powder for use as a starting material for a hard material satisfies a D50 of from 2.0 μm to 6.0 μm and a D10/D90 of from 0.20 to 0.50, wherein D50 is a particle size at a cumulative percentage of 50% of a particle size distribution by volume, D10 is a particle size at a cumulative percentage of 10% of the particle size distribution by volume, and D90 is a particle size at a cumulative percentage of 90% of the particle size distribution by volume.

First claim

The invention claimed is:

1. A titanium carbonitride powder for use as a starting material for a hard material, the titanium carbonitride powder satisfying:
a D50 of from 2.0 μm to 6.0 μm; and
a D10/D90 of from 0.20 to 0.50,
wherein D50 is a particle size at a cumulative percentage of 50% of a particle size distribution by volume, D10 is a particle size at a cumulative percentage of 10% of the particle size distribution by volume, and D90 is a particle size at a cumulative percentage of 90% of the particle size distribution by volume, and
wherein all X-ray diffraction peaks of (2,0,0), (2,2,0), and (2,2,2) planes as measured with Cu Kα X-rays have a full width at half maximum of from 0.03° to 0.20°.

2. The titanium carbonitride powder according to claim 1 , wherein the titanium carbonitride powder satisfies a D50 of from 2.5 μm to 3.5 μm.

3. The titanium carbonitride powder according to claim 1 , wherein each titanium carbonitride particle forming the titanium carbonitride powder contains two or fewer pores.

4. A method for manufacturing the titanium carbonitride powder according to claim 1 , comprising:
a providing step of providing starting powders including titanium oxide powder and carbon powder;
a mixing step of mixing the starting powders without pulverization to obtain a mixed powder; and
a heat treatment step of heating the mixed powder in a nitrogen-containing atmosphere at a temperature of from higher than 2,000° C. to 2,500° C. to obtain a titanium carbonitride powder.

5. The method for manufacturing a titanium carbonitride powder according to claim 4 , wherein
the method comprises, after the mixing step and before the heat treatment step, a granulation step of granulating and sizing the mixed powder to obtain a granulated powder,
in the heat treatment step, the granulated powder is heated to obtain a granulated powder of titanium carbonitride, and
the method further comprises a de-agglomeration step of disintegrating the granulated powder of titanium carbonitride.

Assignees

• Sumitomo Electric Industries

Inventors

• FUKAE Kosuke
• Michiuchi Masato
• Tsuda Keiichi

Classifications

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• C04B35/58 Primary

  based on borides, nitrides, {i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides} or silicides {(containing free binder metal C22C29/00)} · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01B21/0828 Primary

  Carbonitrides or oxycarbonitrides of metals, boron or silicon · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title