# US 4,612,045 A · Method for making aluminum nitride powder

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- Number: US 4,612,045 A
- Document ID: US4612045A
- Status: Granted
- Kind: A
- Application number: 06/774,448
- Filed: 1985-09-10
- Granted: 1986-09-16
- Earliest claimed: 1984-09-10
- Assignees: Chugai Ro Co., Ltd.
- Inventors: Yasuyuki Shintaku
- Web page: https://patentgrep.com/patent/US4612045A

## CPC

- C01B 21/0722: {Preparation by direct nitridation of aluminium}
- B01J 10/002: {carried out in foam, aerosol or bubbles}
- B01J 10/005: {carried out at high temperatures in the presence of a molten material}
- B01J 19/26: Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
- B01J 2219/00087: with heat exchange elements outside the reactor
- B01J 2219/00096: Plates
- B01J 2219/00159: controlling multiple zones along the direction of flow, e.g. pre-heating and after-cooling
- B01J 2219/0871: Heating or cooling of the reactor
- B01J 2219/0879: Solid
- B01J 2219/0886: Gas-solid
- B01J 2219/0894: Processes carried out in the presence of a plasma
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

A method for making an aluminum nitride powder comprises atomizing a molten aluminum into a nitriding atmosphere of N.sub.2 gas of elevated temperature and solidifying the finely divided liquid particles of aluminum which have been nitrided.

## Claims

### Claim 1

A process for making aluminum nitride powder which comprises the step of:
(a) melting metallic aluminum;
(b) atomizing the molten aluminum by high temperature N.sub.2 gas into an N.sub.2 atmosphere of not lower than 800.degree. C., to thereby form atomized particles of aluminum nitride, and
(c) cooling the atomized particles of aluminum nitride to produce an aluminum nitride powder.

### Claim 2 (depends on 1)

The process according to claim 1 wherein the N.sub.2 gas atomizing the molten aluminum is compressed.

### Claim 3 (depends on 2)

The process according to claim 2 wherein the metallic aluminum is in the form of a wire which is melted by the use of a plasma arc or plasma jet and is simultaneously atomized with said compressed N.sub.2 gas.