Patent · US Expired

Method of controlling the oxygen content of a powder

US7931855B2 · kind B2 · utility

1Cited by

11References

11Claims

0Family size

Inventors

Roger Berglund · Visby, SE
Hans Eriksson · Västerås, SE
Johan Sundstrom · Lövstabruk, SE
Per-Ola Arvidsson · Kvicksund, SE

Key dates

Filing date	Oct 6, 2005
Grant date	Apr 26, 2011
Priority date	—
Expiry date	Apr 26, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/12014
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A method of reducing the oxygen content of a powder is provided. A canister is prepared with a getter, filled with the powder to be densified, sealed and evacuated. The canister is subjected to a hydrogen atmosphere at an elevated temperature whereby hydrogen diffuses into the canister through the walls thereof. The hydrogen forms moisture when reacted with the oxygen of the powder and the moisture in the reacted with the getter in order to remove oxygen from the powder to the getter. The atmosphere outside the canister is then altered to an inert atmosphere or vacuum, whereby hydrogen diffuses out of the canister. A dense body having a controlled amount of oxygen can thereafter be produced by conventional powder metallurgy techniques.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.