The invention discloses
brazing filler metal for
brazing a W-Cu composite and Fe-based
alloy, a method and a
brazing technique. The brazing
filler metal is in a foil piece strip shape. The thickness of the brazing
filler metal ranges from 50 micrometers to 100 micrometers. The brazing filler
metal comprises, by weight, 6.0%-9.0% of Mn, 3.5%-5% of Co, 0.3%-1.7% of Ni, 2.0%-5.0% of Zr, 1.2%-2.8% of Ti, and the balance Cu. The brazing temperature of the brazing filler
metal ranges from 1000 DEG C to 1050 DEG C, the
melting temperature of the brazing filler
metal is moderate, and the brazing filler metal is uniformly melted;
diffusion and the interface reaction of
alloy elements in the brazed connection process can be promoted through a brazing filler
metal foil piece, and the
wetting and spreading capacity of the brazing filler metal on the surfaces of the W-Cu composite and the Fe-based
sintered alloy is improved;
crystal particles are refined,
residual stress is reduced, and the mechanical performance of joints is improved; the brazing technique for connecting the W-Cu composite and the Fe-based
sintered alloy through the brazing filler metal is stable and reliable, vacuum brazed connection is used, a component is in a
vacuum state in the heating process, the whole component does not deform, the defects such as microscopic cracks, air holes and inclusions are avoided, and the
wetting and spreading capacity of the surface of the brazing filler metal is good.