Polycrystalline diamond (collectively referred to as diamond polycrystalline) is produced by sintering a number of high quality diamond fine powders under conditions of high temperature and pressure and with or without additives. The artificial polycrystalline diamond shows its strong vitality due to the following characteristics: (1) The crystals are arranged in a disordered state, so the hardness is uniform and non-directional; (2) It has high strength, especially impact strength and wear resistance. (3) can be made into a specific shape; (4) can design or predict the performance of the product, giving the product the necessary characteristics to suit its specific use. De Beer's Dr. Dell is also very concerned about the future development of high technology. Once industrial diamonds can replace other products, they can obtain huge market benefits. One of the new development areas is polycrystalline diamond. Previously, in oil well drilling, only 2% used cutting heads, and the rest were possessed by tungsten carbide cutters and roller bits. Pope J of Synthetic Diamonds of the United States made an estimate of the sale of polycrystalline diamonds in the Western market, arguing that sales of polycrystalline diamonds in the Western market in 1985 were $48 million, equivalent to 12% of total sales of superhard materials. After five years, sales soared 806 times to $413 million. In a large company, sales of polycrystalline diamond accounted for about 25% of the total sales of superhard materials. To this end, De Beer has recently developed a production line to produce polycrystalline diamonds with hard alloy substrates such as Syndrill and Syndite. Table Forecast Polycrystalline Diamond Market Capacity Table Unit: Million US dollars Now, in the mechanical processing industry, the commonly used materials for tools are high speed steel, hard alloy, ceramic. Tools made of these materials are difficult to effectively cut hard and wear-resistant materials that are difficult to machine. Practice has proved that the ideal tool for machining difficult-to-machine materials with high cutting efficiency should have the same hardness and wear resistance as diamond, and the thermal stability and chemical inertness of cubic boron nitride or ceramics is as high as that of hard alloys. Strength and impact resistance, but even in the future it is not possible to find a material with all of this desirable performance. From this point of view, the most promising way to develop better tool materials is to combine several known tool materials to form a complex superhard material that provides a variety of superior properties. Scientists at GECo in the United States began exploring and researching this composite material in the early 1970s. They developed the diamond composite sheet (Compax) and the cubic boron nitride composite sheet (Compact), which are used in machining tools. Applications will grow substantially, with the fastest growth. Drawing die - drawing non-ferrous metals, such as copper, galvanized, nickel-plated copper, aluminum, gold, etc., as well as hard wire such as tungsten, molybdenum, preferably pull copper wire. A wire drawing die can draw 7,000 tons of copper wire before grinding, which is equivalent to 300~1000 times of cemented carbide mold or 5~10 times of natural diamond mold. At present, the polycrystalline diamond wire drawing die has a wire diameter ranging from 8 to 0.1 um. Thanks to the development of precision perforation technology, it is possible to control various irregularly shaped wires. Due to the appearance of fine-grained and ultra-fine-grain products, polycrystals can be used as drawing molds and can also be used as finished molds. Petroleum Geological Drills - Beginning in 1973, there are three series of polycrystalline diamond oil and geological drill bits for mass production and application. GECo believes that the polycrystalline diamond of the special geological drill, Geoset, is a major development in the application of synthetic diamond. Twist Drills - After the 1980s, diamond drills were extended to general boreholes. One is a twist drill, which is equipped with a roof-forming or gable-shaped sandwich diamond composite sheet for punching holes in non-metallic materials or non-ferrous metals or alloys such as stone and concrete, and is popularized in the electronics industry. The technical development of polycrystalline diamond is summarized in the following aspects: (1) the emergence of large-scale polycrystalline wafers; (2) self-proclaimed series of thermal stability products; (3) continuous refinement of grains; (4) shape structure diversification.
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