... ,Bi,CoAppearance: Different particle size nano cobalt powder is black to the deep black, no other color mixed, sphere, no obvious agglomerate.Widely ... energy. As the cobalt powder metallurgy binder can ensure hard alloy certain toughness. Magnetic alloy is indispensable material for modern electronic and mechanical ... includes elements such as B,Al,Si,Cr,Mn,Fe,Co,Cu,Mo,W,P,C,S. We offer at your ...