The 6th International Conference on Superhard Materials (2)

[China Superhard Materials News] On November 15th, 2013, the 6th Zhengzhou International Superhard Materials and Products Seminar was held in Dahe Hall, 5th Floor, Zhengzhou International Convention and Exhibition Center Conference Center. This seminar was organized by China Machine Tool Industry Association. The Superhard Materials Branch is co-sponsored by a number of industry organizations such as the United Nations Superhard Materials and Products Engineering Technology Research Center. In the past 50 years, China's superhard materials have grown from scratch to small. China's super-hard materials products follow the development trend of the industry and seize the development opportunities. After years of research and practice, we have developed a wide variety of tools for grinding, drilling, sawing and cutting of super-hard materials, which are widely used in machinery manufacturing. Geological drilling, building materials processing, construction engineering, semiconductor materials, aerospace, special ceramic materials, large metal parts cutting and other industrial fields, showing great ability to replace traditional tools, from weak to strong in several application fields Global market position. This paper intends to analyze the development of China's superhard material products technology, pointing out the opportunities and challenges of China's superhard material products technology development under the current development environment, and looking forward to the future development prospects of the industry.

The diamond wire saw is a "flexible" cutting tool that represents a higher level of sawing tools and has achieved rapid development in recent years. Diamond wire saw is a small branch of super-hard material tools. To continue to maintain rapid development, it is necessary to continuously expand the application field and target the world as a target market, and solve the problem of diamond wire saws and main raw materials such as beading and wire rope consolidation. The performance characterization, through the realization of production automation, improve production efficiency and quality stability; solve the problems of wire rope quality and bead structure design in wire saws.

The report designed and produced a new structure of ultra-fine diamond wire saw with an outer diameter of only 2.0 mm. The sawing parameters were determined by sawing marble test and analyzed. The results show that the sawing speed is equivalent to the diamond wire saw with the outer diameter of 8.8mm, and the cutting power consumption is small, the waste residue discharge is less, and the stone cutting yield rate is increased by more than 30%.
Type IIa diamond is a diamond with minimal nitrogen content. It has the highest thermal conductivity, the highest optical transmittance and the widest optical transmission band. It can maximize the thermal, optical and mechanical properties of diamond. The defense and industrial fields with extremely high material performance requirements have broad application prospects. This report studies the synthesis technology of high quality large size IIa diamond under high temperature and high pressure conditions. The stability, the quality, integrity, symmetry and growth rate of the diamond crystal are improved by optimizing the alloy catalyst composition, adjusting the temperature field distribution of the synthesis chamber, and the like.

This report investigates the feasibility of C-nano onion without binder high pressure sintering PCD. It was found that the C-nano onion containing the core of diamond structure can be sintered into a bulk at a pressure of 5.5 GPa, a temperature of 1200 ° C and a holding time of 15 min. The average hardness is about 32 GPa, and the obtained nanocrystalline diamond contains A certain amount of twins; the same C-nano onion is added to 10wt%~50wt% micron diamond, under the same process conditions, can be sintered into PCD, the highest hardness reaches 71 GPa. The main reason is that the addition of micron diamond changes the pressure transfer state of the powder in the high pressure process to some extent. Another important reason is that the added micron diamond surface plays an active role in the conversion of C-nano onion into diamond.

Hardened steel (45~68HRC) has a wide range of applications and can be used in power transmission mechanical components, bearings and gears. Polycrystalline cubic boron nitride (PCBN) has been rapidly developed in the field of hardened steel processing for several years due to its extremely high hardness, good heat resistance and high thermal conductivity. This report introduces a new line of PCBN grades focused on the turning of hardened steel parts. The research focuses on extending tool life and increasing productivity, thus reducing the cost of parts in hardened steel turning applications. Whether in continuous or intermittent turning applications, new PCBN grades exhibit improved resistance to crater wear and blade toughness.

The report ball-milled Ti3SiC2 and sub-micron diamond mixed powders, reducing the average particle size of Ti3SiC from 5 μm to about 20 nm, and uniformly distributing nano-sized Ti3SiC2 particles on the surface of submicron-sized diamond particles. The high pressure sintering behavior of the initial material was studied under pressure (strong) 5.5 GPa and temperature 600~1650 °C. X-ray diffraction and transmission electron microscopy analysis showed that Ti3SiC2 can be decomposed into nano-sized TiC and glass-phase Ti-Si at 600-700 °C. The diamond reacts with Ti-Si to form a Ti-Si-C solid solution. By simultaneously controlling the temperature-pressure conditions, we obtained a nanostructured diamond-TiC/Ti-Si-C composite superhard material. Under the condition of loading 10kg (98N), the highest hardness HV and fracture toughness KIC of the sample measured by the dimensional indentation method reached 45.SGPa and 14Mpa•m1/2, respectively.

The study aimed to develop "cytoscopic microchips". Firstly, the biaxial ultra-fine CNC machine tool was designed and developed, and the line discharge grinding technology was built on the machine tool to process the concentric and thin-blade boron-containing polycrystalline diamond wheel cutter. Then use this wheel cutter to perform array micro groove processing on NAK80 die steel with "online high speed and shallow shallow grinding technology". Experiments have confirmed that a boron-containing polycrystalline diamond wheel cutter with a blade width of 5 μm can be produced by wire-cut discharge molding, and an array micro-groove having a width of 8 μm can be successfully developed for NAK80 die steel. Since the wheel cutter is formed in-line, the machining can be performed with the original precision of the spindle, and the grinding performance of extremely high stability is obtained, which greatly eliminates complicated correction time. In this study, a vertical polishing shaft was also constructed on the machine tool developed so that the surface of the mold can be polished on the surface and the micro-grooves of the array can be removed; the surface roughness can reach 0.045 μm. In addition, due to the nano-depth grinding, the depth of removal is very small, so the diamond wheel cutter can be processed at room temperature, effectively reducing the affinity of carbon atoms and iron atoms in the diamond. The material removal mechanism still allows the wheel cutter to The diamond structure performs differential shearing on the iron atoms of the die steel.
Using the self-developed two-stage large-cavity static high-pressure device, the micro-crystalline diamond and CBN were used as the initial materials for the first time, and a large-body (about 3mm diameter) BCN super-hard block translucent sample was synthesized and tested under the loading force of 5kg. The Vickers hardness (about 74 GPa) of the obtained sample has been within the hardness range of the diamond single crystal (70 to 100 GPa). The synthesized samples were characterized by Raman scattering, scanning electron microscopy, and Vickers hardness testing. The above work lays the foundation for promoting the industrial application of BCN superhard alloy materials.

The report uses a muffle furnace, which uses different types of cubic boron nitride (CBN) crystals synthesized at high temperature and high pressure, and performs high-temperature calcination at a temperature of 1000 °C for 2 h. The morphological changes and impact toughness of CBN crystals before and after calcination were studied by scanning electron microscopy and impact toughness test. The results showed that the performance of CBN crystals before and after calcination was significantly different. Scanning electron microscopy showed that different varieties The surface of the CBN has different degrees of burns. The impact toughness test showed that the impact toughness TI value of CBN decreased by 9%-60%, and the thermal shock toughness TTI value decreased by 3%-39%.
Nanocrystalline diamond is regarded as a new generation of high-performance superhard material. It not only has excellent physical and chemical properties such as high hardness and high thermal stability of diamond single crystal, but also has higher toughness, isotropy and wear resistance. As well as processability, the application prospect is broad. This report introduces the use of the two-stage large-cavity static high-pressure device developed by the author's own laboratory to realize the direct conversion from stone and ink to diamond under ultra-high pressure and high temperature. The nano-polycrystalline diamond block was synthesized for the first time in China. material. The synthesis pressure of the sample was about 17 GPa and the temperature was about 2300 °C. The synthesized samples were characterized by micro-area X-ray diffraction, scanning electron microscopy analysis and Vickers hardness test, which made a pioneering attempt for the industrialization of nano-polycrystalline diamond in China.

According to the characteristics of high-temperature and high-pressure synthesis of six-face press, this report discusses four key technologies for synthesizing large-diameter PCD composite sheets with six-face press, namely: raw material selection, formulation and mixing and purification treatment, assembly structure design, High temperature and high pressure sintering process, and analyzed the impact of various key technologies on the synthesis of large diameter PCD composite sheets. Through the optimization and improvement of these four key technologies, the yield and product quality of synthetic large-diameter PCD composite sheets can be improved.


The effects of various factors on the color and bonding force of the coating were investigated by experiments. It was found that the influence of current magnitude, temperature, bias voltage, vacuum degree and nitrogen flow rate on the coating was obvious. Experiments have shown that when different materials are used as the matrix, the required conditional factors need to be appropriately changed. The metal matrix is ​​firmly bonded, and non-metal bonding is difficult. At normal temperature, when the bias voltage is 250V, the vacuum degree is 0.35Pa, and the total power is 1400W, the nitrogen flow rate is 5sccm, which is the optimum plating condition.

The report measures the content of internal impurity elements in abrasive-grade diamond particles produced by different manufacturers as a guide for selecting diamond micropowder raw materials, and produces special diamond micropowder. The TI value of the selected abrasive grade diamond was tested. It was found that the TI value of diamonds of different manufacturers had a trend corresponding to the content of some elements.

The report outlines the basic method of homogenization of high-temperature and high-pressure diamond single crystals, and introduces the influence of synthetic process design on the final product. The application characteristics of the standard powder of pressure-transfer medium in the homoepitaxial growth of large single crystal are the focus of this paper.

The report summarizes the theoretical basis and calculation method of first-principles calculation based on density functional theory, and focuses on the research status of material calculation in the field of super-hard materials. It classifies several typical and important super-hard materials. A system comprising a plurality of carbon allotropes, boron based compounds, nitrogen based compounds, and the like. A large number of calculation results show that the hardness index of many new materials has exceeded that of cubic boron nitride, which is very close to diamond, and has great potential to become a new type of superhard material. By introducing in detail the latest developments in the calculation of superhard materials in domestic and foreign materials, it is hoped that it will provide theoretical basis for further calculations in the future, especially for specific synthetic preparation experiments.
The report verified by the theoretical analysis and the standard according to the standard that the main problem of the JB/T 7990-1998 standard is that the two methods of measurement specified by the standard have different particle size composition data, and the prescribed microscopic detection method is troublesome. The main problem with the ANSI B74.20-2004 standard is that for a fine powder of 2 μm, it is wrong to specify DS equal to 0; the rule that long rod-shaped particles with an aspect ratio greater than 2 is not allowed to deviate from the actual situation, the current technology And the process is difficult to do; the upper boundary of the large particles is too large and unreasonable. Both standards have problems in that large particle sizes are not compatible with the width of the distribution.


The report uses four systems—a binder without a binder, a metal binder, a ceramic binder, and a metal + ceramic binder. Based on WC+Co, the PCBN is synthesized using high temperature and high pressure conditions. Through the observation of scanning electron microscopy and the comparison of wear ratio, microhardness and flexural strength, it is concluded that the comprehensive performance of PCBN synthesized by metal + ceramic binder is better. X-ray diffraction phase analysis shows that the added metal binder Al will chemically react with CBN under high temperature and high pressure to form stable AlB2.


The report summarizes the experience and lessons of the development of ultra-high pressure technology in the past 50 years. Starting from the basic properties of mineral materials, the flow of solid blocks of pyrophyllite in different sizes of ultra-high pressure chambers is carried out on various high-pressure equipment. The test was carried out to discuss the effect of the rheological behavior of pyrophyllite on pressure transmission and sealing.


The report reviews the achievements of China in the study of the functional properties of cubic boron nitride single crystals by the author's personal experience, and shows the outstanding achievements of the development of superhard materials in China from one aspect. Encourage young people to broaden their horizons and contribute to the overall development of superhard materials.

The research progress of the new superhard material AlMgB14 was reviewed. The research progress and summary of the crystal structure, mechanical properties, preparation methods and toughening strengthening of AlMgB14 materials were discussed.
The polymer network gel method is a method for preparing single-component, multi-component nano powders and binder powders. The super-fine-grained diamond grinding wheel with ceramic bond was prepared by polymer network gel method, and the grinding performance of single crystal silicon wafer was tested. The results show that under the condition of experimental grinding process, the grinding wheel prepared by polymer network gel method can achieve the grinding of silicon wafer, and the surface quality of silicon wafer is obviously better than that of ultrafine grain diamond grinding wheel prepared by traditional methods.

According to the development and changes of wind turbine blades in recent years, the report briefly describes the types, processing methods and processes of superhard tools required for processing, and expounds the main functions, defects and improvement methods of superhard tools in blade processing. As the country continues to pay attention to green and clean energy, it is expected that the application of superhard tools in the wind power industry will be more extensive.

Ethanol Fireplace

Ethanol Fireplace,Ethanol Burner Fireplace,Ethanol Fireplace Burner,Stainless Steel Ethanol Fireplace

JINAN LODOR CNC EQUIPMENT CO.,LTD , https://www.zgfireplace.com