The 6th International Conference on Superhard Materials (1)

[China Superhard Materials News] On November 14, 2013, the 6th Zhengzhou International Superhard Materials and Products Seminar was held in the first conference room on the 4th floor of Zhengzhou Deyi Hotel. This seminar was organized by China Machine Tool Industry. The Association's Superhard Materials Branch is co-sponsored by a number of industry bodies including the United Nations Superhard Materials and Products Engineering Technology Research Center.

At the seminar, Li Zhihong, secretary-general of the Superhard Materials Branch of China Machine Tool Industry Association, made an industry development report of “a half century, 50 years of glory”. This report also became the first lecture of the seminar, which was officially opened. The prelude to the Superhard Materials Technology Forum.



As a metal bond, drill powder is widely used in diamond tools, especially on gang saw cutting marble. In this article, the impact of diamond holding power is evaluated by analyzing and comparing different drilling powder properties, which in turn affects the cutting performance of diamond tools made with these drill powders. We focus on the different properties of the drill powder from the aspects of mechanical properties, hardness and tensile strength. The results show that Eurotungstene's drill powder has outstanding stable internal structure by detecting the hardness and microstructure of the drilled carbide at different sintering temperatures. Also, at high sintering temperatures, there is no diamond carbonization. It is precisely because of these outstanding performance after the drilling of the powder that the tungsten powder of the European tungsten company has a very good grip on the diamond. When the gang saw cuts the marble, the cutter head reciprocates back and forth in a straight line, which requires a high diamond holding force. The European tungsten company's drill powder is very successful in the application of gang saw cutting marble by virtue of its good diamond holding power.



In 1948, the Japan Diamond Industry Association was established to seek the sound and progressive development of the Japanese diamond industry, thereby contributing to the development of the national economy. At home, the Japan Diamond Association assisted in the discharge of chemical substances and materials, the Management Promotion Law, the Labor Safety and Health Law, Legislation on water pollution prevention and control laws, air pollution prevention and control laws and other relevant laws and regulations. The contents of the association's activities mainly include the development of technology and equipment in the diamond industry, suggestions to government agencies, defenses, and the release of information to other relevant teams, other undertakings for the purpose, and the organization of subcommittees (technical committees, patent committees, General Committee).

The report introduces the Japanese diamond powder import volume, importing country, import amount, diamond\CBN tool production amount, use evolution, diamond powder sales evolution, and PCB\PCBN sales evolution. The report also gives the third visit to China by the representatives of the Japan Diamond Industry Association, exchange of views on JIMTOF and the opening of the membership meeting in Japan, which will introduce the details of the China Diamond Association.



The report is divided into three parts, which respectively introduce the high-pressure equipment for manufacturing sawing and its improvement; the catalytic mechanism of sawing growth and the sawing of the six-faced growth array. The report shows the production level of sawing and high-pressure equipment in the decade from 2000 to 2010, as well as the production cost and sales price trend. It also lists the domestic domestic and foreign experts in the manufacture of sawing equipment and industry.



The report introduces the production of modern wire saw group saws, gives the extreme application of single wire saws and group saw wire saws, the production method of group saw wire saws, the market of group saw wire saws, and the efficient production of group saw wire saws. Recommended steps. Wire saws are used for cutting marble, granite, etc.; as well as injection molding or rubber vulcanization. Introduced the current standard wire saw parameters and existing problems. Wire saw saws can be produced by various methods such as hot isostatic pressing, injection molding, hot pressing, and pressureless infiltration.



The report focuses on the use of water jet laser technology for single crystal diamond cutting, CVD diamond and other superhard materials. The required water must be pure water, which has the advantages of low water consumption and low pressure requirements, and the particle size is less than 0.2 μm. Water jet laser can minimize damage to the surface of the workpiece, save costs and improve processing precision. At the same time, water is both a laser cutting tool and a cooling and cooling effect.



The report describes the development of PCBN grades for low-content cubic boron nitride from Element Six, the world's leading supplier of industrial diamond raw materials. Element Six has a number of multinational companies in Germany, Ireland, the United Kingdom, the Netherlands, China and other places, more than 3,000 employees worldwide, sales of about 500 million US dollars. The company's divisions are divided into abrasives (oil and gas, advanced materials, hard alloys) and technology; the report details the types and uses of each sector's products.



This report mainly introduces the mechanical structure, pressure calibration, heating assembly design, temperature calibration and diamond composite material of the secondary 6-8 large cavity static high pressure device constructed by the author's laboratory based on the domestic six-face press. The secondary top hammer produces some exploratory work for ultra high pressure. The pressure calibration results show that the 14/8 (pressure transmission medium side length / second stage top hammer surface length in mm) and the maximum chamber pressure achievable in 12/6 assembly are about 18 GPa, 10/4. The maximum chamber pressure for assembly is approximately 20 GPa; temperature calibration results indicate that all three assemblies can operate stably at 2300 K. In terms of loading tonnage, the pressure generation efficiency of the two-stage supercharging device based on the six-face press is about 2.5 times that of the 2-6-8 type supercharging device based on the two-face press. In order to achieve higher pressure, the laboratory carried out the experimental exploration of using the diamond composite secondary top hammer to generate ultra-high pressure on the basis of designing three kinds of hard alloy secondary assembly. The in-situ resistance measurement was used to observe Zr under high pressure. The phase change (α-ω, 7.96 Gpa; ω-β, 34.5 GPa) method calibrates the cavity pressure of a 5.5/1.5 assembly constructed from a polycrystalline diamond-hard alloy composite final anvil. Experiments show that the self-developed polycrystalline diamond-hard alloy composite final anvil can increase the upper limit of pressure generation of the secondary pressurization system based on the domestic six-face pressing mechanism frame from about 20 GPa to over 35 GPa, expanding the domestic market. The pressure generation range of the cavity static high pressure technology. Applying this technology, we hope to further optimize the design of the final anvil material and the pressure chamber to generate a high pressure exceeding SOGPa in the pressure chamber of the secondary 6-8 large cavity static high pressure device based on the domestic six-face press. .

In order to improve the drilling efficiency of the impregnated diamond drill bit in the hard and dense weak abrasive formation, the theory of weakening of the carcass was introduced into the design of the drill bit, and the application test of the weakened fetal diamond bit was carried out. The results show that the mechanical drilling speed is increased by 68% compared with the ordinary impregnated diamond drill bit; the weakened particles are easily detached from the surface of the carcass during the drilling process, and the surface is formed with regenerative pits. The non-smooth shape weakens the wear resistance of the carcass, reduces the contact area between the labial surface of the bit and the rock face at the bottom of the hole, and increases the pressure per unit area of ​​the bit facing the rock; the weakened particles that fall off participate in the bottom of the hole. The wear bit body of the drill bit improves the grinding ability of the rock powder at the bottom of the hole and promotes the cutting edge of the new granular diamond in the carcass.



In order to reduce the wear of the PDC bit when drilling the rock layer and improve the drilling performance, based on the theoretical analysis, the cutting test is used to simulate the PDC bit to cut the rock, the cutting angle, the exposure amount and the line speed of the PDC bit. And the effect of pressing hardness on the wear law of the composite sheet was studied. The test sets five different cutting angles, the amount of exposure, the line speed and the indentation hardness, respectively, to ensure that the volume wear of the composite sheet is measured separately under the condition of constant pressure and friction path. The results show that under the same force, with the reduction of the cutting angle, the stress at the same position of the cutting teeth of the composite sheet increases, and the wear of the composite sheet increases, the service life of the drill bit is shortened; the cutting teeth of different cutting angles There is a corresponding optimal exposure amount. For example, when the cutting angle is 15°, the optimal exposure amount is 2mm; the volume wear of the composite sheet is proportional to the linear velocity during drilling, and can be obtained by the linear velocity v. It is obtained that the volume wear of the composite cutting teeth is inversely proportional to the rock indentation hardness.


Silica-aluminum hybrid polymer was prepared by sol-gel method using aluminum nitrate, aluminum isopropoxide and ethyl silicate as raw materials, and applied to the research of abrasive bond and diamond coating. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (SET-IR), X-ray diffractometer (XRD), differential scanning calorimetry-thermogravimetric analyzer (DSC-TG), etc. The structure and properties of diamond were characterized. The effects of different sintering regimes on the hardness and flexural strength of the grinding wheel specimens prepared by the binder were also studied. The results show that the silica-alumina prepared by the sol-gel method The powder form of the hybrid polymer binder is irregular in shape, uniform in particle size, and good in heat resistance. The synthesized silicon-aluminum hybrid polymer binder is heat treated at 400 ° C, and then sintered at 500 ° C to prepare a grinding wheel. With specimens, the tested grinding wheel has a hardness of up to 76HRB and a flexural strength of 67.83MPa. The coating of the silicon-aluminum compound coating with diamond improves the chemical structure and thermal properties of the diamond surface, and the apparent weight loss rate occurs. There was almost no thermal weight loss before the acceleration, especially the diamond's antioxidant temperature, and the thermal weight loss rate increased the mutation temperature by 75 °C.


Glass-ceramic is a new type of inorganic non-metallic material formed by uniform distribution of glass phase and microcrystalline phase. It has high mechanical strength, good thermal shock resistance, wear resistance and corrosion resistance. It has a wide range of applications. prospect. The continuous development of new preparation processes for glass-ceramic binders is of great significance for improving the quality of grinding wheels. A detailed systematic review of the types and preparation methods of glass-ceramic binders was reported.


The report developed a new environmentally friendly process and equipment for purifying synthetic diamonds, using physical methods to remove impurities from synthetic diamond surfaces. In the process of production operation, impurities such as graphite, metal and pyrophyllite attached to the surface of the synthetic diamond can be directly removed without using any acid or alkali. The technology not only has simple operation, short production cycle, greatly reduces production cost, but also avoids problems such as high energy consumption and high pollution by chemical separation methods such as acid-base and high-temperature oxidation. The technology has small investment, small land occupation, simple process, low transformation and maintenance cost, and is very suitable for the technical upgrading of large, medium and small artificial diamond enterprises.

For details of the report, please pay attention to the "Proceedings of the 6th Zhengzhou International Superhard Materials and Products Symposium".

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