Brazing material for joining ferrous sintered members and joining method of ferrous sintered members

摘要

PPROBLEM TO BE SOLVED: To solve such a problem that traditional brazing filler metal consisting of Cu-Ni-Mn series alloy powder is susceptible to oxidation and sulphurization, so that a fluctuation of conditions such as atmosphere can give a large influence on a joining state resulting in an unstable product quality. PSOLUTION: The brazing material used for joining iron-based sintered members contains 35-48 mass% Cu, 12-20 mass% Mn and the balance being Ni with inevitable impurities whose oxygen amount is not more than 0.1 mass%. When viscosity and melting temperatures are necessary to be adjusted according to quality, density of members to be joined and atmosphere in a furnace, Fe not more than 15 mass% can be added to the component of the brazing filler metal. Furthermore, it is desirable to adjust a specific surface area of the brazing filler metal for the iron-based sintered member to not more than 500 cmSP2/SP/g. PCOPYRIGHT: (C)2010,JPO&INPIT