The great Chinese diamond industry – China’s synthetic diamond production accounts for 90% of the world

By | 13/06/2019

Science Network July 18 news, superhard materials and products represented by diamonds are known as “the hardest and sharpest industrial teeth.” Aerospace, defense and military, as well as a variety of difficult materials processing problems in the field of photovoltaic and electronic information, in front of it.

In the eyes of scientists, single crystal diamond is not only “industrial teeth” but also “the ultimate semiconductor.” At the China Superhard Materials Industry Development Symposium held on July 17, some experts even said that “there is no information industry without diamonds.”

As a new material, superhard materials lead the development of high-end manufacturing in China.

By the end of 2017, China’s synthetic diamond production has accounted for more than 90% of the world’s total output, and cubic boron nitride production has accounted for more than 70% of the world’s total. China has become a veritable superhard material manufacturing and manufacturing country.

However, in the application of some high-end industries, there are still some shortcomings in China. “Products that are small in quantity and variety, companies don’t want to do it, but short boards are often in these places.” Tian Yongjun, an academician of the Chinese Academy of Sciences, said bluntly.

It is expected to trigger a new generation of semiconductor technology revolution

According to Gan Yong, director of the National New Materials Industry Development Expert Advisory Committee and former vice president of the Chinese Academy of Engineering, superhard materials are an important and unique sector in the field of new materials and have been widely used in national economic construction.

“Industrial teeth” is well-deserved. Taking a diamond turning tool as an example, the radius of the cutting edge of the cutting edge can be sharpened to a scanning electron microscope and cannot be detected. It can be directly obtained by mirror cutting.

“Using the super-hard mechanical properties of diamond, it can process all the known materials in the world.” Li Zhihong, senior consultant of the Superhard Materials Branch of China Machine Tool Industry Association, told the Journal of Chinese Journal of Science and Technology, “Using its unparalleled thermo-acoustic performance. It can be used for astronaut cosmic ray protection, stealth and anti-corrosion of cutting-edge weapons and equipment, improving missile flight speed and strike accuracy, high-power laser detection, and can be used as a cutting-edge field for large-scale integrated circuits and LED new light source heat sinks.”

Some mobile phones are hot in a dozen, and the temperature does not work because the semiconductor components are not resistant to high temperatures. Single crystal diamonds that combine the excellent properties of electricity, optics, mechanics, acoustics and thermals will solve this problem.

Diamond electronic devices have the advantages of small size, high integration, and no need for refrigeration compared to other semiconductor devices. Zhang Tao, a professor at the School of Materials Science and Engineering at Beijing University of Aeronautics and Astronautics, believes that diamond will revolutionize the next generation of semiconductor technology.

By the end of 2017, China’s synthetic diamond production has accounted for more than 90% of the world’s total output, and cubic boron nitride production has accounted for more than 70% of the world’s total. China has become a veritable superhard material manufacturing and manufacturing country.

 

Although the product quality technology of China’s superhard materials has reached the world’s advanced level in general, Gan Yong said frankly, “there are short-boards in some high-end industries.”

For example, in the field of hard alloy bar grooved grinding wheels, the high-end market is basically monopolized by developed countries such as the United States, Japan and Germany. Although the domestic super-hard material grinding wheel preparation technology has been developing, the sharpness and shape retention of the grinding wheel Contradiction is still a major problem in slotted grinding wheels.

“Products that are small in quantity and variety, companies don’t want to do it, but short boards are often in these places.” Tian Yongjun, an academician of the Chinese Academy of Sciences, said bluntly.

This poses a challenge to the innovation and sustainability of the superhard materials industry. To this end, Tian Yongjun said that while the state attaches importance to scientific research, it should also lean toward related industries, and high-end frontiers cannot rely on imports.

Domestic equipment is the key

According to Dr. Chang Song, a department of materials processing engineering at Tsinghua University, in November last year, Netease News “Great China Made” introduced that the cost of synthetic diamonds is about half that of naturally mined diamonds. China’s 2016 synthetic diamond production is approaching 20 billion carats.

China’s synthetic diamonds have an absolute advantage in the world and are inseparable from the industrialization of large-scale synthetic presses, high-quality hard alloy top hammers, powder catalysts and indirect heating processes (collectively referred to as powder processes).

The large-scale synthetic press is the core equipment for synthetic diamond. It needs to create a high-temperature (>1400°C), high-pressure (>5GPa) synthesis chamber. According to the carbon element equilibrium phase diagram, the carbon atoms are stabilized in this cavity. Diamond crystals.

Commonly used in foreign countries are uniaxial presses, commonly known as two-sided presses, while in China, they use a 90-degree three-axis press. This six-sided press presses the three-axis pressure by a hinged structure.

 

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