Although China's synthetic diamond production ranks first in the world, there is still a big gap between product quality and developed countries. The main performance is that the impact strength and high-temperature impact strength of the product are low, and there are many impurities and defects, which can be used to manufacture high strength of saw blades. Diamond only accounts for about 20% of the total product, while RVD and MBD products account for about 80%.
2. Cubic boron nitride
Cubic boron nitride (CBN) has excellent physical, chemical and mechanical properties such as high hardness, high wear resistance, high thermal conductivity and heat resistance, and low friction coefficient. It is especially suitable for processing of iron group metal materials. Excellent materials for productivity and processing quality have been widely used in industrialized countries. China's CBN products have been in existence for 32 years, but they have been slow to develop over the past 20 years from 1966 to 1989. After entering the 1990s, the rapid development of China's automobile and motorcycle industry has provided a powerful driving force for the development of CBN, and the output has increased significantly (see Figure 2).
Figure 2 Schematic diagram of China's CBN production growth
From 1990 to the present, the average annual growth rate of China's CBN production is 25%, which greatly exceeds the annual growth rate of CBN consumption in developed countries by 15%, but it is very different from the developed countries in the application field and application level. abrasive manufacturing processes and equipment for the imperfect, abrasive quality and performance of instability, special grinder and grinding work is not complete arts and so on.
3. Diamond film
The diamond film is a superhard film prepared on a non-diamond substrate by chemical vapor deposition (CVD) or other methods. It can be used not only for making all kinds of diamond tools, but also as a functional material for making acoustic sensors, speaker diaphragms, infrared windows, X-ray detection windows, etc., and it is widely used. Internationally, since the early 1970s, trial production of diamond films has been carried out and the research and development of diamond films has been rapidly set off. China began this research in the mid-1980s and has been included in the national “863 Programâ€, which can now be prepared. 
80mm, 2mm thick diamond film, and has achieved a lot of results in applied research, but currently it is still in the development stage, and has not yet reached the stage of industrial application. It is expected that diamond film will be the main material of the 21st century diamond industry, and scientists from all over the world are making unremitting efforts to industrialize diamond film.
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