Grinding and forming of diamond powder

Grinding and forming are the key links in the production of diamond powder. The previous production process was based on ball grinding, which was mainly based on grinding and had moderate low-speed mechanical impact. It has been replaced by air mill.

The working principle of air grinding: compressed air is injected into the grinding room at high speed through the nozzle, and the diamond raw materials repeatedly collide, friction, shear at the intersection of multiple high-pressure air streams, and then are crushed. The particles are crushed by high-speed collision, and the surface of the particles is crushed by friction shear and formed.

Diamond powder is a kind of superhard fine grinding and polishing material in the world today. In terms of its particle size, it belongs to micron, submicron and nano-powder. Compared with coarse-grained powder, its specific surface area and specific surface functional group are significantly increased, so the force between particles increases greatly during production. In addition, with the refinement of the particle size, the defects of the particles themselves are reduced, and the strength is bound to increase. It can be seen that the production process of diamond powder is quite difficult, which is not only the process of particle refinement, but also accompanied by changes in crystal structure and surface physical and chemical properties. Therefore, the production process of diamond powder is a multidisciplinary engineering and technical problem involving machinery, powder engineering, mechanics, physical chemistry, modern instruments and testing technology.

With the development of cutting-edge technology and high-end manufacturing needs, the surface finish of many precision devices are very high, such as computer disk head optical communication devices, optical crystals, semiconductor substrates and other devices, all need precision polishing processing, if the surface has any convex and concave beyond the permitted scope, scratches or attached foreign bodies, the accuracy and performance of the design will not be guaranteed. In short, with the efforts of China's industry personnel, the manufacturing level of China's diamond powder is improving year by year, the same materials and equipment conditions have the world's highest cost performance, but there is still a certain gap between the international high-end powder, diamond powder production there are many new problems need to be overcome by peers, which is also our future development goals and tasks.