Development of superhard materials in China and its application in machining
Development and Applications in Machining Industry Li Zhihong et al Abstract: The development and applications in machining industry of superhard materials in China are introduced. The excellent properties and application fields of the synthetic diamond and cubic boron nitride (CBN) are indicated, and some practical examples in machining are also described. The importance of further researching,developing and extending the applying fields of superhard materials is pointed out. I. Overview Synthetic diamond and cubic boron nitride (CBN) are collectively referred to as superhard materials. 1963 Zhengzhou Institute of abrasive grinding abrasive in collaboration brothers institutes, successfully developed China's first man-made diamond, the middle of 1966 to complete the test and put into mass production, when the production of synthetic diamond 10,000 kt. In the same year, the institute successfully developed China's first cubic boron nitride (CBN). Since then, China has the ability to mass produce superhard materials. Next page The round head Bolt has only one head shape with a slot, and the semicircular Screw head is exposed to the installed surface after installation. Round Head Bolt,Round Head Allen Bolt,Round Head Bolt And Nut,Round Head Square Neck Bolt Jiangsu Jiajie Special Screw Co., Ltd , https://www.tzbolts.com
Of Superhard Materials in China
Keywords: superhard material synthetic diamond CBN cutting tool abrasive grinding
From the birth of China's superhard materials to the end of the 1980s, the output increased slowly, and it experienced a stage of perfecting the production process and gradually improving the product quality from scratch. At the end of the 1980s, with the rapid growth of demand for China's stone processing industry, super-hard materials entered a stage of rapid development. In 1997, the annual output reached 500 million carats, ranking first among the world's largest producers of super-hard materials.
Diamond is the hardest material known in the world, and has many excellent properties such as high thermal conductivity, high insulation, high chemical stability, high temperature semiconductor characteristics, etc. It can be used for high-quality processing of non-ferrous metals such as aluminum and copper, especially suitable for Processing hard and brittle non-metallic materials. Cubic boron nitride is a superhard material with hardness second only to diamond. It has excellent properties such as high hardness, high thermal stability and high chemical stability. It is especially suitable for processing hard, tough and difficult to process metal materials. Diamond and cubic boron nitride also have good infrared transmittance and wide forbidden band width. In recent years, they have been used as functional materials to make high-tech products such as transparent windows and high-temperature semiconductors, and are widely used in advanced industries such as electronics and aerospace.
Except for a small part of superhard materials used directly for grinding, polishing, coating and other processes, most of them are made into various tools for different industrial fields (see Table 1).