The 19th China Superhard Materials Technology Development Forum was held

[China Superhard Materials News] On November 13, 2015, the 19th China Superhard Materials Technology Development Forum was held in the Dahe Hall of Zhengzhou Convention and Exhibition Center. This forum was organized by the China Machine Tool Industry Association Superhard Materials Branch. The Hard Materials and Products Engineering Technology Research Center and the State Key Laboratory of Superhard Materials Abrasives are co-sponsored by many industry organizations. At 10:30 in the morning, Zhao Bo, secretary-general of the Superhard Materials Branch of China Machine Tool Industry Association, announced the official launch of the 19th China Superhard Materials Technology Development Forum 2015.

At the seminar, Professor-level senior engineer, Senior Consultant of Superhard Materials Branch of China Machine Tool & Tool Industry Association, Director of Mechanical Industry Occupational Skills Identification Abrasives Industry Center, Editor-in-Chief of Diamond and Abrasives Engineering, Superhard Material Technology Expert Li Zhihong, deputy director of the committee, made an industry development report on “Analysis of the economic operation of the super-hard materials industry in 2014”. This report also became the first lecture of the seminar, which officially kicked off the superhard material technology forum.
Report summary:
In this paper, the statistical data of the national macroeconomic data, main indicators of the economic operation of the industry, the quality of major products, and the import and export status of 2014 are given in 19 statistical tables. It shows that although GDP reached a record high of 63.65 trillion yuan in 2014, the growth rate was 7.4%, but in the fourth year of decline, the growth rate slowed down and the national macro economy entered a new normal. The super-hard materials industry has fierce competition in the market, the profit margin has generally declined, and the quality of major products has risen steadily. The sales revenue of 85 companies has reached 11.9 billion yuan, a slight increase of 1.5%; the diamond output has reached a record high of 16.8 billion carats, with a growth rate of 11.3. %. The nominal economic growth rate of major economic indicators is lower than GDP. The change of long-term strong development momentum has been subjected to unprecedented development pressure. However, the import and export market has increased more than the total import and export of the country, and it is more active than in 2013. In particular, the export growth rate is large, which provides a certain favorable space for the development of the industry.
Report summary:
Introduced the basic situation of the Japan Diamond Industry Association: the association is committed to the development of the Japanese diamond industry and promotes the development of the entire Japanese national economy. Introduced the membership of the association: diamond, CBN manufacturers, sellers; 49 member companies, 2 sponsors. At the same time, it also introduced the relevant laws and regulations for the development of the Japanese diamond industry. In China, it mainly deals with pollutant discharge and conversion (PRTR) regulations; industry safety standards and health regulations; water pollution prevention regulations and air pollution control regulations.
Report summary:
Carbon fiber reinforced plastic CFRP has been widely used in high-end applications such as aerospace and racing for many years. Due to changes in the market demand for the fuel economy and the emission reduction needs of the aerospace and commercial vehicle industries, everyone is paying more and more attention to the advantages of CFRP. The combination of high specific strength and high specific stiffness combined with low weight makes it a material for many applications in these and other industries. CFRP is known to be very difficult to machine because it is inherently anisotropic and the fibers are highly abrasive, which can lead to rapid wear of the tool. Defects on the surface of the workpiece have a significant impact on material processing. This article details the tooling situation for next-generation polycrystalline diamonds, but is not limited to CFRP. It introduces the CFRP milling and finishing process, investigates the current types of tools in the industry, and details the areas in which PCD tool materials can play an important role.
China has long been a major producer of saw diamonds, but it is still trapped in the use of six-sided tops, providing many new ideas, such as the use of four top hammers to synthesize split-type cylinders, and then using a pointed hammer to advance from both ends to increase the hot stroke to make the growth rod The length is doubled. In addition, the growth of the array increases the number of saw drills per unit volume. He also boldly proposed to use the constant temperature method to grow carat-class diamonds with large single crystal relays, including the beautiful gems of the blue-nuclear yellow meat white shells that have never been heard before.
Report summary:
The total reserves of diamonds on the planet are about 2.5 billion carats, of which about one-fifth is gem-quality, and now the annual mining volume is about 100 million carats, so natural diamonds will be exhausted after a few decades. The high-temperature high-pressure HPHT method and the chemical vapor deposition CVD method for the synthesis of diamonds are perfect, the popularization of identification technology, and the market access gradually mature, and will gradually fill the gap in the natural diamond market. In China, there are 7,000 six-face presses in use. After nearly 20 years of improvement, the growth effect of the six-face press has exceeded the pressure belt press used in Europe and America, and the separation ball (BARS) pressure from Russia. Machine and two-sided concave press. The existing six-sided top press for growing diamond abrasives can grow gem-quality colorless rough diamonds with a slight improvement, and the size can be from one millimeter to ten millimeters, and the finished diamonds for jewelry of half to ten carats are ground. The new diamond technology company in St. Petersburg, Russia, uses the six-sided top press imported from China to produce the color of the DEF, the clarity of the IF and VVS, and the weight of 1 carat to 10 carats.
Report summary:
Detonation nanodiamond has excellent mechanical properties, high thermal conductivity and instability, and has a wide application prospect in determining its special chemical, force, heat, light and electric lamp properties. Thermodynamic instability determines that it is easily converted to other carbon forms. Surface modification can achieve precise regulation of nanodiamond structure and surface state. High-resolution transmission electron microscopy was used to observe the evolution and combined growth process of detonated nanodiamond particles to nano-onion-like fullerenes. The friction and wear tester was used to test the anti-wear performance of the lubricant with modified nano-diamond particles, and the scratch wear morphology was observed by scanning electron microscopy. The experimental results show that the lubricating oil or grease with the surface of the modified detonation nano-diamond attached with graphene particles has a friction coefficient reduced by 30%-60%, and the wear amount is 2/3 before the addition, showing good performance. Reduce wear and anti-friction performance.
Report summary:
Introduced diamond band saw, inner and outer circular cutting piece, diamond wire saw, round grinding wheel, chamfering grinding wheel, thinning grinding wheel, grinding and polishing liquid, diamond dicing blade, diamond milling cutter and PCBN tool, etc. Applications in new energy industries such as power generation and LEDs, focusing on the specifications, models, sizes, diamond sizes, binders used in the processing of monocrystalline and polycrystalline silicon, LED sapphire chips and wind turbine blades. Conditions of use and performance.
Report summary:
This study compared the main mechanical properties of UMCD, BDMCD, UFGD and two new boron-doped composite diamonds. The results show that boron doping technology can effectively improve the adhesion of diamond films, so BDM-UMCD and BDM-UFGCD films have good adhesion properties. The BDM-UMCD film with the UMCD film on the surface has the advantage of extremely high surface hardness of the UMCD film, but the surface roughness is high and the surface can be polished. In addition, the composite film also has a higher surface hardness than the single-layer UFGD film due to the complementary effect of the extremely high hardness intermediate layer UMCD on the surface hardness.
Report summary:
In order to investigate the grain boundary bond and mechanism of polycrystalline cubic boron nitride in high pressure infiltration sintering process, we use high pressure infiltration method and mixing method respectively, the sintering pressure is 5.0-5.5GPa, temperature is 1300-1600 °C, heating time The sintering behavior of CBN was compared under the condition of 10-15 min. The X-ray diffraction phase analysis, scanning electron microscopy and hardness test were performed on the sintered samples.
Report summary:
The detonation nanodiamond was annealed at 1100 ° C and 0.1 Pa vacuum to obtain a round onion carbon containing a nanodiamond core. Different amounts of micron diamond were added to the round onion carbon, and the additive-free polycrystalline diamond was prepared by sintering at 1200 ° C + 5.5 GPa + 15 min. X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and hardness measurement showed that the hardness of PCD increased first and then decreased with the increase of micron diamond. When a mass fraction of 50% micron diamond is added, the PCD hardness is up to 44.67 GPa. When the amount of micro-diamond added is less than 50%, the higher the content of micro-diamond, the better the combination of micro-diamond and diamond matrix transformed by round onion carbon, no micro-diamond peeling phenomenon, the more the size of diamond particles converted by round onion carbon Large, more uniform, up to 20nm. Micron diamond mass fractions of 30%, 40%, 50% are more suitable. The addition of micron diamond enhances the internal pressure transfer of the sample, improves the carbon conversion rate of the onion and improves the performance of the PCD.
Report summary:
In this paper, the six-sided top press is implanted into the circuit, and the in-situ resistance is used to measure the phase transformation of Bi, Tl and Ba at high temperature. The six-sided top-stage pressure chamber is different in magnesia and pyrophyllite pressure transmitting medium. The pressure (strong) of the position is calculated by the pressure gradient of the pressure medium of magnesia and pyrophyllite. The relationship between the pressure gradient of the two pressure transmitting media along the axis of symmetry and the pressure of the cavity is established. The measurement results show that the pressure gradient of the two pressure-transfer media increases with the increase of pressure; when the cavity pressure is the same, the pressure gradient of magnesium oxide is about twice that of pyrophyllite. It can be seen that in order to obtain accurate experimental data of a large sample box with uniform performance, when high pressure experiments are carried out using pyrophyllite or magnesium oxide as a pressure transmitting medium, quasi-hydrostatic pressure treatment of the experimental assembly is required. Our experimental results not only apply to the six-face press, but also to the four-sided press and the secondary eight-face top device.

Note:
The spokesperson of the seminar has a representative, and there are certain discrepancies between the original author of the academic report and the photos of the site; the "The 19th China Superhard Materials Technology Development Forum Proceedings" edited by the Superhard Materials Branch of China Machine Tool Industry Association is the final standard.

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