Patent ID: 6391252
Filing Date: 2002-05-21
Classification: B22F,B23K

Abstract:
A powder metallurgy method for manufacturing a molded part which is to be assembled by self-brazing at a specific temperature to a receiving metal part, the method comprising:preparing a homogeneous mixture of basic powder, brazing powder and binding agent, wherein the basic powder is made of an alloy making it possible to obtain desired metallurgical characteristics and has substantially no melting element, the brazing power is made of an alloy including at least one melting element at a content such that the liquidus temperature of the alloy of the brazing powder is below the solidus temperature of the alloy of the basic powder, the basic powder and brazing powder being selected such that the liquidus temperature of the brazing powder is below the self-brazing temperature and the solidus temperature of the basic powder is higher than the self-brazing temperature; injection molding the mixture into a mold at a sufficient temperature, pressure and time such that the binding agent gains consistency and forms a molded blank; extracting the molded blank from the mold; removing the binding agent from the molded blank; and sintering the molded blank at a temperature higher than the liquidus temperature of the brazing powder but below the temperature of the subsequent self-brazing treatment so as to obtain a molded part suitable for self-brazing and having a relative density of at least 95%.