Method of controlling the oxygen content of a powder

Details Method of controlling the oxygen content of a powder Method of controlling the oxygen content of a powder

2011-04-26

2011-04-26

Kastler, Scott (Department: 1736)

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Special medium during sintering

C075S343000, C075S369000, C419S036000, C419S037000, C419S057000

Reexamination Certificate

active

07931855

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.

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