# US 9,751,769 B2 · Method for production of titanium carbide nanoparticles

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- Number: US 9,751,769 B2
- Document ID: US9751769B2
- Status: Granted
- Kind: B2
- Application number: 14/411,850
- Filed: 2013-06-03
- Published: 2015-06-25
- Granted: 2017-09-05
- Earliest claimed: 2012-06-28
- Assignees: Nisshin Engineering Inc.
- Applicants: Nisshin Engineering Inc.
- Inventors: Shu Watanabe; Keitaroh Nakamura
- Web page: https://patentgrep.com/patent/US9751769B2

## CPC

- C01B 32/921: Titanium carbide
- H05H 1/30: using applied electromagnetic fields, e.g. high frequency or microwave energy (H05H1/28 takes precedence)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- H05H: PLASMA TECHNIQUE (apparatus or processes specially adapted for producing X-rays H05G2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS

## Abstract

A method for production of titanium carbide nanoparticles, the method having: a step for supplying titanium powder or titanium oxide powder into a thermal plasma flame; and a step for producing titanium carbide nanoparticles by supplying a reactive gas as a cooling gas and as a source of carbon at the downstream end of the thermal plasma flame. By varying the supplied quantity of the reactive gas, the oxygen concentration of the produced titanium carbide nanoparticles is varied. Therefore, for example, titanium carbide nanoparticles having different volume resistivity values can be produced.

## Claims

### Claim 1

A titanium carbide nanoparticle production method comprising: a production step for producing titanium carbide nanoparticles using titanium powder or titanium oxide powder, a carbon source and a thermal plasma flame, wherein the production step comprises:
a step of dispersing the titanium powder or titanium oxide powder in a carbon-containing liquid substance as the carbon source to obtain a slurry; and
a step of converting the slurry into droplets to supply the droplets into the thermal plasma flame, and
wherein a feed rate of the slurry is controlled such that an oxygen concentration of the produced titanium carbide nanoparticles falls within a range of 1 to 10 mass %.

### Claim 2 (depends on 1)

The titanium carbide nanoparticle production method according to claim 1, wherein the carbon-containing liquid substance is alcohol, ketone, kerosene, octane or gasoline.

### Claim 3 (depends on 2)

The titanium carbide nanoparticle production method according to claim 2, wherein the thermal plasma flame is derived from at least one gas of hydrogen, helium and argon.

### Claim 4 (depends on 1)

The titanium carbide nanoparticle production method according to claim 1, wherein the thermal plasma flame is derived from at least one gas of hydrogen, helium and argon.

### Claim 5

A titanium carbide nanoparticle production method comprising: a production step for producing titanium carbide nanoparticles using titanium powder or titanium oxide powder, a carbon source and a thermal plasma flame, wherein the production step comprises:
a step of dispersing titanium powder or titanium oxide powder in a carbon-containing liquid substance as the carbon source to obtain a slurry; and
a step of converting the slurry into droplets to supply the droplets into the thermal plasma flame by using a carrier gas,
wherein, while a feed rate of the slurry is maintained to be constant, a flow rate of the carrier gas for charging the slurry is controlled such that an oxygen concentration of the produced titanium carbide nanoparticles falls within a range of 3 to 9 mass %.

### Claim 6 (depends on 5)

The titanium carbide nanoparticle production method according to claim 5, wherein the carbon-containing liquid substance is alcohol, ketone, kerosene, octane or gasoline.

### Claim 7 (depends on 6)

The titanium carbide nanoparticle production method according to claim 6, wherein the thermal plasma flame is derived from at least one gas of hydrogen, helium and argon.

### Claim 8 (depends on 5)

The titanium carbide nanoparticle production method according to claim 5, wherein the thermal plasma flame is derived from at least one gas of hydrogen, helium and argon.

### Claim 9 (depends on 5)

The titanium carbide nanoparticle production method according to claim 5, wherein the carrier gas is an inert gas.

### Claim 10 (depends on 5)

The titanium carbide nanoparticle production method according to claim 5, wherein the flow rate of the carrier gas is 65 to 540 wt % with respect to an amount of charged slurry in terms of powder.