C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 3/04 (2006.01) B22F 1/00 (2006.01) C22C 33/02 (2006.01) C22C 38/22 (2006.01)
Patent
CA 2318214
The invention concerns a low pressure process for the preparation of an iron- based, optionally alloyed powder comprising the steps of preparing a raw powder essentially consisting of iron and optionally at least one alloying element selected from the group consisting of chromium, manganese, copper, nickel, vanadium, niobium, boron, silicon, molybdenum and tungsten; charging a gas tight furnace with the powder in an essentially inert gas atmosphere and closing the furnace; increasing the furnace temperature; monitoring the increase of the formation of CO gas and evacuating gas from the furnace when a significant increase of the CO formation is observed and cooling the powder when the increase of the formation of CO gas diminishes.
L'invention concerne un procédé basse pression pour préparer une poudre à base de fer, éventuellement en alliage, qui consiste à préparer une poudre brute constituée pour l'essentiel de fer et éventuellement d'au moins un élément d'alliage choisi dans le groupé constitué de chrome, de manganèse, de cuivre, de nickel, de vanadium, de niobium, de bore, de silicium, de molybdène et de tungstène; à charger la poudre dans un four étanche aux gaz dans une atmosphère de gaz sensiblement inerte et à fermer le four; à augmenter la température dans le four; à surveiller l'augmentation de la formation de CO et à évacuer le gaz du four lorsqu'elle prend des proportions importantes et; à refroidir le four lorsque la formation de CO diminue.
Arvidsson Johan
Eriksson Ola
Fetherstonhaugh & Co.
Hoganas Ab
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