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

B - Operations, Transporting

22

F

B22F 1/00 (2006.01) B22F 3/12 (2006.01) B22F 9/00 (2006.01) C22C 33/02 (2006.01)

Patent

CA 2581860

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 hydroge 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.

La présente invention concerne un procédé permettant de réduire la teneur en oxygène d'une poudre. On prépare une boîte filtrante pourvue d'un piège à eau, on la remplit de la poudre à densifier, on y fait le vide, et on la ferme. On expose ensuite la boîte à une atmosphère d'hydrogène à température élevée. L'hydrogène se diffuse alors à l'intérieur de la boîte filtrante au travers de ses parois, et en réagissant avec l'oxygène de la poudre, forme de l'eau qui réagit à son tour avec le piège. En plaçant la boîte sous atmosphère inerte ou sous vide, l'hydrogène repasse à l'extérieur de la boîte. On obtient alors un corps dense à teneur en oxygène contrôlée se prêtant alors au traitement conventionnel de métallurgie des poudres.

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