PURPOSE: To obtain an electrical contact material having superior melt sticking resistance, hardly dissipative property and insulation resistance by adding the boride of a specified metal and graphite to an iron group metal and silver and dispersing the metallic boride in the iron group metal and silver.
CONSTITUTION: A powdered mixtue consisting of 5W70wt% powder of the boride of at least 1 kind of metal belonging to the IVa, Va or VIa group in the periodic table such as W, Mo, Ta, Nb, Ti, Cr, Zr or V, 1W11wt% graphite powder, 5W 60wt% powder of at least 1 kind of iron group metal such as Ni, Fe or Co, and the balance Ag powder is compacted, sintered in a hydrogen atmosphere, and compacted again to manufacture an alloy having porosity close to zero. The metallic boride is solubilized in the iron group metal with superior mechanical strength and bonding strength at high temp., and it is dispersed in the Ag, thereby obtaining an electrical contact material having superior characteristics such as melt sticking resistance.
AMANO YOSHINARI
OSADA MITSUO
KUROISHI ATSUSHI
