B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 3/10 (2006.01) B22F 1/00 (2006.01) B22F 7/06 (2006.01)
Patent
CA 2350655
The invention concerns a method using powder metallurgy for making components capable of being assembled by self-brazing to receiving metal parts, comprising the following steps: a) preparing a molten or liquid mixture of a basic metal powder, with a brazing metal powder and a binding agent. The brazing powder is an alloy comprising at least a melting element in its solidus temperature; b) injecting said mixture in a mould of the component to be produced, the mould being maintained in temperature and time conditions such that the binding agent gains consistency; c) removing the moulded blank; d) eliminating the binding agent from the blank; e) sintering the blank from which the binding agent has been removed at a temperature higher than that of the brazing powder liquidus temperature but less than self-brazing temperature. The manufacturing method can be applied to a process for repairing components of aeronautical or land gas turbines in superalloy based on Ni, Co or Fe.
Le procédé de fabrication par métallurgie des poudres de pièces de forme susceptibles d'être assemblées par autobrasage à des pièces métalliques réceptrices comporte les étapes suivantes: a) préparation d'un mélange fondu ou liquide entre une poudre métallique de base, une poudre métallique de brasage et un liant. La poudre de brasage est un alliage comprenant au moins un élément fondant de sa température de solidus, b) injection du mélange dans un moule de la pièce de forme à réaliser, le moule étant maintenu dans des conditions de températures et de temps telles que s'y réalise la prise de consistance du liant, c) extraction de l'ébauche moulée, d) élimination du liant de l'ébauche, e) frittage de l'ébauche déliantée à une température supérieure à celle de liquidus de la poudre de brasage mais inférieure à celle d'autobrasage. Application du procédé de fabrication à un procédé de réparation de composants de turbines à gaz aéronautique ou terrestre en superallige à base de Ni, de Co ou de Fe.
David Francois
Huchin Jean-Pierre
Leroy Yves
Malie Andre
Metals Process Systems
Robic
Snecma Services
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