摘要
Hard alloy is a composite material composed of infusible metal carbide and bonded metal. The infusible metal carbide usually refers to the carbides composed of dements such as W, Ti, Ta, V, and Hf, these elements belong to the fourth to the sixth families in the periodic table. The hard alloys used most expensively are WC, TiC, and TaC, one or more than one kind of these carbides interacts with the bonded metal Co to constitute
