Method for creating porous structures by particle expansion

Patent metadata

Field	Value
Publication number	US-10648064-B2
Application number	US-201916405265-A
Country	US
Kind code	B2
Filing date	May 7, 2019
Priority date	Jul 28, 2014
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A process for producing a metal foam includes mechanically working a metallic powder such that oxide particles are finely dispersed within a metallic matrix and annealing the mechanically worked metallic powder in a vacuum the annealed metallic powder such that intraparticle porosity is formed by decomposition of the oxide particles at elevated temperature to reduce the oxide particles to metallic form and liberate the oxygen atoms in gaseous form, thereby creating porosity.

First claim

The invention claimed is:

1. A process for producing a metal foam comprising:
mechanically working a metallic powder such that oxide particles and/or dissolved oxygen are finely dispersed within a metallic matrix;
annealing the mechanically worked metallic powder in a vacuum; and
forming the metal foam of the annealed metallic powder having intraparticle porosity formed by decomposition of the oxide particles at an elevated temperature to reduce the oxide particles to metallic form and liberate the oxygen atoms in gaseous form, thereby creating porosity.

2. The process of claim 1 , wherein the metallic powder is a silver containing metallic powder.

3. The process of claim 1 , wherein the mechanical working ball milling the metallic powder.

4. The process of claim 1 , wherein the metallic powder is a copper containing metallic powder.

5. The process of claim 3 , wherein the ball milling is cryogenic ball milling.

6. The process of claim 3 , wherein the ball milling is room temperature ball milling.

7. The process of claim 1 , wherein the annealing occurs at a temperature less than or equal to 800° C.

8. The process of claim 1 , wherein the annealing occurs at a temperature less than or equal to 400° C.

Assignees

• Millersville Univ Of Pennsylvania
• Us Army

Inventors

• Atwater Mark Andrew
• Darling Kris Allen
• Tschopp Jr Mark Allen

Classifications

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F2009/043

  by ball milling · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• B22F3/1143

  involving an oxidation, reduction or reaction step · CPC title

• C22C1/08 Primary

  Alloys with open or closed pores · CPC title