Ti(CN) cermet cutters have successfully replaced WC in many processing applications due to their better red hardness, lower corrosivity, thermal conductivity and friction coefficient, and better anti-sticking ability than WC-based cemented carbide tools. Carbide tools. As early as the 1960s, the process of obtaining ultra-fine WC-based hard alloys with high strength, high hardness and high wear resistance by refining the grains was popularized and applied, and the prepared ultra-fine WC-based hard alloys were widely used. The micro drills, printing needles and various cutting tools used in the manufacture and processing of printed circuit boards have greatly improved the life of the tools. It can be said that the design principle, preparation process and production equipment of ultra-fine cemented carbide are relatively mature.
Japan is a world leader in the development of cermet cutting tools, and its cermet tools account for 30% of all tool production. Japan's Mitsubishi Corporation reported on the development of ultra-fine cermets and introduced the brand name NX2525 and NX1010 ultra-fine cermet. A typical feature of these two ultrafine cermets is that the hard phase has an average grain size of less than 1 micron and is excellent in overall performance. According to analysis, the preparation method of Mitsubishi NX2525 and NX1010 ultra-fine cermet is: high-quality ultra-fine Ti (CN) powder or TiC + TiN powder + Ni, Co, Mo2C, TaC, NbL, WC fine powder → wet grinding → grain selection → Pressing → atmosphere sintering → hot isostatic pressing → finished product.
Xiong Weijun of Huazhong University of Science and Technology discussed the influence of particle size refinement on the properties of cermets in the literature. It is believed that the hardness and strength of cermets made with finer materials are significantly improved. The main preparation methods of ultrafine cermet proposed by Xiong Weijun's literature are: ultrafine TiC, TiN, WC powder + ordinary Mo, Ni powder → ball milling → pressing → vacuum sintering → finished product.
Xu Yudong of Hefei University of Technology recently used nano-scale TiN as an additive to modify the cermet and obtained a cermet material with significantly improved wear resistance. The preparation method is: nano TiN + ordinary TiC, Mo, Ni, C powder → wet grinding → granulation → pressing → vacuum sintering → finished product.
It can be seen from the above reports that Mitsubishi Corporation of Japan has adopted atmospheric sintering and hot isostatic pressing technology in the preparation process of ultrafine cermet, but it has not been used in domestic related research. The atmosphere sintering technology can effectively inhibit the N 2 decomposition of TiCN or TiN, and significantly reduce the possibility of pore formation in the alloy; the hot isostatic pressing technology can improve the sintering performance of the alloy, eliminate the pores, and improve the bonding strength of each phase, thereby Improve the performance of the alloy.
Compared with ordinary cermets, the main advantage of ultra-fine cermets is to improve the yield strength and toughness of the materials.
Japan is a world leader in the development of cermet cutting tools, and its cermet tools account for 30% of all tool production. Japan's Mitsubishi Corporation reported on the development of ultra-fine cermets and introduced the brand name NX2525 and NX1010 ultra-fine cermet. A typical feature of these two ultrafine cermets is that the hard phase has an average grain size of less than 1 micron and is excellent in overall performance. According to analysis, the preparation method of Mitsubishi NX2525 and NX1010 ultra-fine cermet is: high-quality ultra-fine Ti (CN) powder or TiC + TiN powder + Ni, Co, Mo2C, TaC, NbL, WC fine powder → wet grinding → grain selection → Pressing → atmosphere sintering → hot isostatic pressing → finished product.
Xiong Weijun of Huazhong University of Science and Technology discussed the influence of particle size refinement on the properties of cermets in the literature. It is believed that the hardness and strength of cermets made with finer materials are significantly improved. The main preparation methods of ultrafine cermet proposed by Xiong Weijun's literature are: ultrafine TiC, TiN, WC powder + ordinary Mo, Ni powder → ball milling → pressing → vacuum sintering → finished product.
Xu Yudong of Hefei University of Technology recently used nano-scale TiN as an additive to modify the cermet and obtained a cermet material with significantly improved wear resistance. The preparation method is: nano TiN + ordinary TiC, Mo, Ni, C powder → wet grinding → granulation → pressing → vacuum sintering → finished product.
It can be seen from the above reports that Mitsubishi Corporation of Japan has adopted atmospheric sintering and hot isostatic pressing technology in the preparation process of ultrafine cermet, but it has not been used in domestic related research. The atmosphere sintering technology can effectively inhibit the N 2 decomposition of TiCN or TiN, and significantly reduce the possibility of pore formation in the alloy; the hot isostatic pressing technology can improve the sintering performance of the alloy, eliminate the pores, and improve the bonding strength of each phase, thereby Improve the performance of the alloy.
Compared with ordinary cermets, the main advantage of ultra-fine cermets is to improve the yield strength and toughness of the materials.
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