Abstract: Provided is a heat sink which has excellent processability and is economical, even though it employs diamond, as well as, a process for producing the same. The heat sink is molded using a composition obtained by adding a diamond powder of 0.1 to 100 .mu.m high-purity diamond particles to cemented carbide primarily of WC and a balance of at least one metal selected from Co, Ni and Fe along with impurities. The proportion of the diamond powder admixed relative to the cemented carbide is preferably 5 to 90%, and the diamond heat sink is produced by sintering the particulate mixture of diamond, WC, Co, etc. at a temperature of 1200.degree. to 1500.degree. C. under a pressure of 3 to 6 GPa.

Abstract: This invention relates to a method of producing a corrosion-, heat- and wear-resistant member which comprises packing an atomized powder of a high-carbon high-chromium steel into a capsule, heating the capsule packed with the powder, then extruding the capsule packed with the powder to obtain a stock not containing carbide grains greater than 3 .mu.m, working the stock, polishing a surface of the stock, and evaporating a film of TiC and/or TiN onto the polished surface, and further a corrosion-, heat- and wear-resistant member produced by the method. The corrosion-, heat- and wear-resistant member according to this invention is suitable for being members for tools used under extremely severe conditions, such as various tools for can manufacturing, molding tools for reinforced plastics, etc.

Abstract: If cemented carbide products such as hot rolling-mill rolls, plugs and dies can be made of the powder reclaimed from scrapped cemented carbide products and the virgin powder of cemented carbide, it is possible to obtain cemented carbide products lower in price and capable of meeting the requirements of severe working conditions.