目前在各种工具材料中,用粉末冶金法制成的材料占有重要的地位。在这类材料中,硬质合金占主导地位,但是最近切削陶瓷、粉末冶金高速钢(用于制造丝锥和圆柱铣刀)、聚晶金刚石和立方氮化硼的使用正日益增多。目前在车、铣加工中硬质合金刀具切下的切屑占总量的80%以上。涂层硬质合金刀具在保持与普通硬质合金刀具寿命相同的情况下,切削速度可提高50～150%。1984年为生产硬质合金而消耗的钨为14000～15000吨,这相当于世 Currently in a variety of tool materials, powder metallurgy made of materials occupy an important position. Carbide is the dominant material among these materials, but the use of cutting ceramics, powder metallurgy high-speed steels (for making taps and cylindrical mills), polycrystalline diamond and cubic boron nitride is increasing recently. Currently in the car, milling carbide cutting tools cut the total amount of chips accounted for more than 80%. Coated carbide tools to maintain the same life with ordinary carbide cutting tools, the cutting speed can be increased by 50 to 150%. Tungsten consumption of 14,000 to 15,000 tons for the production of cemented carbide in 1984 was equivalent to that of the world