PURPOSE: To provide an Ni-Cu alloy for brazing having high joint strength and excellent fluidity and corrosion resistance be incorporating a specific ratio of Cu, B and Si into Ni.
CONSTITUTION: An alloy for brazing consisting, by atomic %, of Ni; Bal, 3≤Cu ≤30, 0≤B≤15, 0≤Si≤20 and unavoidable impurities in addition thereto is prepd. The alloy is best suitable for joining of a sleeve consisting of a tool steel material and a shaft consisting of a cast iron material. The strength and corrosion resistance at a high temp. can be increased by substituting one or ≥2 kinds among ≤10% Cr, Mo, W, V, Nb, Zr and Ti by atomic % with Ni and if the brazing material is made finely crystalline or amorphous by cooling ultraquickly said material at a rate of ≥104°C/sec, the brazing material having toughness without having segregation is obtd.
ARAKAWA SHIYUNSUKE
HIRAO NORIYOSHI
