The composite alloy contains {HEAD ~ 50 80 wt %}, particularly 55 65 wt %, of the refractory metal and 20 50 wt % of Cu, Ag or Au, and preferably it is prepared by melting and impregnating the highly electroconductive metal into a porous sinter of the refractory metal or the porous sinter containing a small amount, not larger than 10 wt %, of {TAIL ~ a highly electroconductive metal} 
The composite alloy contains { HEAD ~ 50 80 wt % } , particularly 55 65 wt % , of the refractory metal and 20 50 wt % of Cu , Ag or Au , and preferably it is prepared by melting and impregnating the highly electroconductive metal into a porous sinter of the refractory metal or the porous sinter containing a small amount , not larger than 10 wt % , of { TAIL ~ a highly electroconductive metal }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL