PURPOSE: To provide an assembly which withstands use at a high temp. and has substantial joint strength by subjecting base metal composed of sintered hard alloys to liquid-phase diffusion joining with a filler metal consisting of specifically composed C, B, P, Si, W, Ti, Ta, Nb, Co, Ni, etc.
CONSTITUTION: Base metal consisting of sintered hard alloys divided to a plurality is heated and held at the temp. above the m.p. of a filler metal consisting of 3W13atom% C, 0W19% B, 0W10% P, 0W19% Si, 0W10% W, 0W10% Ti, 0W5% Ta, 0W5% Nb and the balance Co or Co and Ni (where 15W22% B+P+Si) and below the m.p. of the base metal and are assembled by liquid-phase diffusion joining by using said filler metal. The joint assembly of the sintered hard parts which withstands use at a high temp., has substantial joint strength, does not require pressurization at a high temp. and is applicable to intricately shaped parts is thus obtd.
YAMAZAKI TATSUO
SHIMOTORI KAZUMI
FUJIWARA TETSUO
