金刚石和立方晶型氮化硼是具有相同结晶结构的物质,它们的原子间都是共价键。这些物质硬度大,烧结困难,合成要在1000℃以上,几万大气压的条件下进行。但由于它们的硬度和热的传导率,比传统的工具材料(如碳化钨、氧化铝等)高得多,是制造超硬工具材料的理想物质。1957年,美国通用电器公司研制成功用高压法合成金刚石,与此同时,这几年,在合成金 Diamond and cubic boron nitride are substances that have the same crystalline structure and all of their atoms are covalent bonds. These materials hardness, sintering difficulties, the synthesis should be at 1000 ℃, tens of thousands of atmospheric conditions. However, due to their hardness and thermal conductivity, which are much higher than traditional tool materials such as tungsten carbide, alumina and the like, they are ideal for the manufacture of super-hard tooling materials. In 1957, the United States General Electric Company successfully developed high-pressure synthesis of diamond, at the same time, these years, synthetic gold