On May 22, 2019, the third-party professional scientific and technological achievements evaluation agency - Zhongke Hechuang (Beijing) Science and Technology Achievement Evaluation Center in Beijing according to the relevant provisions of the Ministry of Science and Technology "Scientific and Technical Evaluation Measures", in accordance with the standards and procedures for the evaluation of scientific and technological achievements In the principle of science, independence, objectivity and fairness, organize experts to focus on Tianbao Yuxiang Machinery Technology Co., Ltd., China University of Mining and Technology (Beijing), Jilin University, Zhengzhou Huajing Diamond Co., Ltd., Zhengzhou Zhongnan Jiete Superhard Materials The "60MN six-face top ultra-high pressure synthetic equipment, key technologies and series product development" project jointly completed by the company has carried out scientific and technological achievements evaluation.
It is reported that the experts of the evaluation meeting are Tian Yongjun, academician of the Chinese Academy of Sciences, Zhou Ji, academician of the Chinese Academy of Engineering, professor of the Beijing Iron and Steel Research Institute, and Bo Yibo, professor of the Beijing Institute of Artificial Crystals, Wang Zhian, professor of Beijing University of Science and Technology, and Ph.D. composition.
After expert review, it is considered that the project has carried out systematic research on the technology of six-face top ultra-high pressure equipment, synthetic gem-quality diamond large single crystal and large-diameter composite super-hard material with Chinese characteristics. The innovative achievements are as follows:
Invented a 60MN six-sided press machine with a drum hinge beam and a "convex concave" working cylinder and piston matching structure;
The double-acting reciprocating supercharging technology was adopted to develop a one-to-two hydraulic station;
The 60MN six-faced ultra-high pressure complete sets of equipment were developed using one of the four screen control technologies. The oil pressure control accuracy is ≤0.3MPa within 15 days, and the heating power control accuracy is ≤0.1%.
The ANSYS is used to optimize the design of the large top hammer structure, which overcomes the contradiction between the top hammer pressure transmission efficiency and the service life;
Through the study of physical and mechanical behaviors and rheological laws of pyrophyllite under high pressure and high temperature, the expansion phenomenon of pyrophyllite high pressure sintering after pressure relief cooling was discovered, and the understanding of the pressure, sealing and heat preservation mechanism of pyrophyllite was deepened, and the long-term trouble was solved. The industry's high-pressure "shooting" problem, the top hammer consumption is reduced by 50%;
The high-nitrogen dark green gemstone diamond and the hydrogen-nitrogen-hydrogen-boron synergistic doped diamond large single crystal were developed. The conductivity of the boron-hydrogen synergistic doped diamond is increased by an order of magnitude, which is expected to be applied to the industrialization of diamond semiconductors;
The 60MN six-face top ultra-high pressure complete equipment was used to develop a gem-quality diamond rapid high-quality growth process, realizing the industrialization of 5-7mm yellow Ib type and 4-5mmIIa gem grade diamond and Φ60-62mmPDC/PCBN tool material.
The project has obtained 10 invention patents and 18 utility model patents. It has made breakthroughs in the domestic industrialization of six-faceted synthetic equipment, processes and products, and promoted the technological progress of China's superhard materials industry and related fields.
The project results have independent intellectual property rights and strong innovation. The overall achievement has reached the international advanced level. Among them, the performance index of 60MN hinged six-faced ultra-high pressure synthetic equipment has reached the international leading level. After a comprehensive review by the expert group, the participating experts unanimously agreed that the “60MN six-faced ultra-high pressure synthetic equipment, key technologies and series product development†project passed the evaluation of scientific and technological achievements.
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