A clean refractory metal sponge fines product is made from refractory metal sponge fines free of refractory metal oxides, carbides, nitrides and binary iron alloys; silicon carbide, oils, greases and organic compounds; salt; dust; dirt; pieces of iron, iron alloy and tungsten carbide; and ...http://www.google.fr/patents/US5776225?utm_source=gb-gplus-shareBrevet US5776225 - Refractory metal sponge fines composition
