IP Library › Granted Patent US 12,311,447
Granted Patent B2
US 12,311,447 · App. 17/929,586 · Granted May 27, 2025

Process for producing spheroidized powder from feedstock materials

Inventors: John Barnes (Sewickley, PA); Aaron Bent (Andover, MA); Kamal Hadidi (Somerville, MA); Makhlouf Redjdal (Melrose, MA); Scott Turchetti (Peterborough, NH); Saurabh Ullal (Hollis, NH); Ning Duanmu (Nashua, NH); Michael C. Kozlowski (Melrose, MA)
Assignee: 6K Inc.
B22F9/14B22F1/065B22F1/142B22F9/04B33Y70/00B22F2301/205B22F2304/10
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Quick Facts
Patent No.
US 12,311,447
App. No.
17/929,586
Granted
May 27, 2025
Kind
B2
Abstract

Disclosed herein are embodiments of methods, devices, and assemblies for processing feedstock materials using microwave plasma processing. Specifically, the feedstock materials disclosed herein pertains to scrap materials, dehydrogenated or non-hydrogenated feed material, and recycled used powder. Microwave plasma processing can be used to spheroidize and remove contaminants. Advantageously, microwave plasma processed feedstock can be used in various applications such as additive manufacturing or powdered metallurgy (PM) applications that require high powder flowability.

Claims (23)

1. A method for manufacturing a spheroidized powder, the method comprising:

providing a feedstock comprising a material selected from the group consisting of copper and copper alloys; and

inserting the feedstock into a microwave plasma to form a spheroidized powder,

wherein the spheroidized powder comprises particles with a median sphericity of at least 0.75, and

wherein the spheroidized powder comprises at least two regions, each region having a different microstructure.

2. The method of claim 1 , wherein the feedstock comprises particles having a particle size distribution of between 15 and 63 microns.

3. The method of claim 1 , wherein inserting the feedstock into a microwave plasma comprises introducing the copper or copper alloy particles into an exhaust of a microwave plasma torch or into a plume of the microwave plasma torch.

4. The method claim 1 , wherein the spheroidized powder has a particle size distribution of between 5 and 45 microns at a low end of the particle size distribution range and between 15 and 105 microns at a high end of the particle size distribution range.

5. The method of claim 1 , wherein the at least two regions include a core portion and a skin portion, the skin portion having a microstructure that is different from a microstructure of the feedstock.

6. The method of claim 1 , wherein the spheroidized powder comprises particles with a median sphericity of at least 0.90.

7. The method of claim 1 , wherein the spheroidized powder comprises particles with a median sphericity of at least 0.99.

8. The method of claim 1 , wherein the feedstock has a particle size of no less than 1.0 microns and no more than 300 microns.

9. A method for manufacturing a spheroidized powder having a desired particle size distribution between about x and about y, wherein x represents a low end of the particle size distribution and having a value of 5 microns and y represents a high end of the particle size distribution and having a value of 45 microns, the method comprising:

introducing copper or copper alloy particles into a microwave plasma torch; and

melting and spheroidizing the copper or copper alloy particles within the microwave plasma torch to form spheroidized powder having the desired particle size distribution of about x to about y;

wherein the spheroidized powder comprises particles with a median sphericity of at least 0.75, and

wherein the collective average or median aspect ratio of the copper or copper alloy particles is between 5:1 to 100:1.

10. The method of claim 9 , wherein the collective average or median aspect ratio of the copper or copper alloy particles is between 5:1 to 20:1.

11. The method of claim 9 , wherein the collective average or median aspect ratio of the copper or copper alloy particles is between 10:1 to 100:1.

12. The method of claim 9 , wherein the introducing copper or copper alloy particles into the microwave plasma torch comprises introducing the copper or copper alloy particles into an exhaust of the microwave plasma torch or into a plume of the microwave plasma torch.

13. The method of claim 9 , wherein the copper or copper alloy particles comprise a particle size distribution of between 15 and 63 microns.

14. The method of claim 9 , wherein the spheroidized powder has a particle size distribution of between 5 and 45 microns at a low end of the particle size distribution range and between 15 and 105 microns at a high end of the particle size distribution range.

15. The method of claim 9 , wherein the copper or copper alloy particles have a particle size of no less than 1.0 microns and no more than 300 microns.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 24, 2025
From: BARNES, JOHN; BENT, AARON; HADIDI, KAMAL; REDJDAL, MAKHLOUF; TURCHETTI, SCOTT; ULLAL, SAURABH; DUANMU, NING; KOZLOWSKI, MICHAEL C.
To: AMASTAN TECHNOLOGIES INC.
Reel/Frame 070939/0496 →
CHANGE OF NAME Recorded Apr 24, 2025
From: AMASTAN TECHNOLOGIES INC.
To: 6K INC.
Reel/Frame 071036/0364 →
Continuity (7)
Continuation 17102244 · Nov 23, 2020
Continuation 16827322 · Mar 23, 2020
Continuation 16446445 · Jun 19, 2019
Provisional Application 62687079 · Jun 19, 2018
Provisional Application 62687094 · Jun 19, 2018
Provisional Application 62687109 · Jun 19, 2018
Related Publication 20230330747A1 · Oct 19, 2023
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