Some Physical Properties of Regeneration Cemented Carbide Using Recycling WC Fine Powder by Tin Impregnation Method

In this experiment, the development of recycling method at cemented carbide scraps was researched. First, brittle alloy was obtained by tin impregnation method and then WC fine powder was procured after the physical crushing. Thereafter, the sample followed by the processes of reduction treatment, molding and sintering works. Some properties of recycled cemented carbides were investigated. The results summarized as follows; Recycled WC fine powder suffered the surface oxidation. Therefore it was necessary to be done by reduction treatment at 1073 K-3.6 ks under hydrogen atmosphere. When sintering condition at 1673 K-3.6 ks was treated under vacuum condition, it gained the deflective strength of about 90%, and gained hardness and sintering density about same value compared with commercial alloys. As a result, it was able to recycle only by 7 processes, that is to say, tin impregnation, physical milling, stirring HCl cleaning, reduction, mixing, molding and sintering works.