Method for treating powder by dry mixing and powder treated thereby

Patent metadata

Field	Value
Publication number	US-9994716-B2
Application number	US-201514741479-A
Country	US
Kind code	B2
Filing date	Jun 17, 2015
Priority date	Jul 4, 2014
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

A method for treating a powder, includes: dry mixing the powder with an effective amount of a treating additive to distribute a layer of the treating additive on a surface of a particle of the powder, a primary particle size of the treating additive being smaller than an average particle size of the powder. An associated treated powder is also described.

First claim

The invention claimed is:

1. A method for treating a powder, comprising:
dry mixing the powder with an effective amount of a treating additive to distribute a layer of the treating additive on a surface of a particle of the powder, a primary particle size of the treating additive being smaller than an average particle size of the powder,
wherein the powder is a metallic alloy,
wherein the powder has an initial angle of repose of about 32 degrees, and
wherein a weight of the treating additive is in a range from 50-80 ppm of a total of the weight of the treating additive and a weight of the powder.

2. The method of claim 1 , wherein said dry mixing occurs for a duration of 1-30 minutes.

3. The method of claim 1 , wherein the dry mixing is by a tumbler mixer, a V blender, a ball mixer, or other instrument.

4. The method of claim 1 , wherein the average particle size of the powder is less than 100 micrometer.

5. The method of claim 1 , wherein the primary particle size of the treating additive is in a range of from 1 nanometer to 100 nanometers.

6. The method of claim 1 , wherein the treating additive is nano silica.

7. The method of claim 1 , wherein the treating additive decreases the angle of repose of the powder.

8. The method of claim 1 , wherein the treating additive is nano carbon.

9. A powder comprising a particle, the particle comprising a layer of a treating additive on a surface thereof, a primary particle size of the treating additive being smaller than an average particle size of the powder,
wherein the powder is metallic,
wherein the powder has an initial angle of repose of about 32 degrees,
wherein said treating additive increases a bulk density of said powder by an amount in a range of about 9.5%, and
wherein a weight of the treating additive is in a range from 50-80 ppm of a total of the weight of the treating additive and a weight of the powder.

10. The powder of claim 9 , wherein said resulting mixture has an angle of repose that is less than the initial angle of repose of the metallic powder.

11. The powder of claim 9 , wherein the average particle size of the powder is less than 100 micrometers.

12. The powder of claim 9 , wherein the primary particle size of the treating additive is in a range of from 1 nanometer to 100 nanometers.

13. The powder of claim 9 , wherein the treating additive is nano silica.

14. The powder of claim 9 , wherein the treating additive is nano carbon.

15. A method for treating a powder, comprising:
dry mixing the powder with an effective amount of a treating additive to distribute a layer of the treating additive on a surface of a particle of the powder, a primary particle size of the treating additive being smaller than an average particle size of the powder,
wherein the powder is metallic,
wherein the powder has an initial angle of repose of about 32 degrees,
wherein the treating additive decreases the angle of repose by 8%, and
wherein a weight of the treating additive is in a range from 50-80 ppm of a total of the weight of the treating additive and a weight of the powder.

Assignees

• Gen Electric

Inventors

• Peng Wenqing
• Wang Guoliang
• Gigliotti Jr Michael Francis Xavier
• Singh Prabhjot

Classifications

• B22F2304/10

  Micron size particles, i.e. above 1 micrometer up to 500 micrometer · CPC title

• C22C33/0278

  with at least one alloying element having a minimum content above 5% · CPC title

• B22F10/20

  Direct sintering or melting · CPC title

• C09C3/06 Primary

  Treatment with inorganic compounds {(C09C3/006, C09C3/048 take precedence)} · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title