3 nano TiN modified TiC based cermet cutter Nano-coated tools recently developed by American scholars are a new tool that uses nanotechnology. This coating method uses different combinations of materials (such as metal/metal combinations, metal/ceramic combinations, ceramic/ceramic combinations, solid lubricants/metal combinations, etc.) to meet different functional and performance requirements. The TiC/TiN composite coating is a typical coating material, and its bending strength is further improved compared with the TiN-based cemented carbide in the TiC-based, and the hardness and toughness of the tool are significantly increased. Because of its excellent anti-friction and self-lubricating properties, it is very suitable for cutting. However, the coating of nano-coatings must use advanced processes, such as closed field unbalanced magnetic sputtering (CFUMS), which requires precise parameter control and advanced equipment, which inevitably leads to a significant increase in tool costs. At the same time, due to the influence of process and cutting conditions, the bond strength of the coating may be insufficient, and the coating may fall off easily during cutting. Cutting performance is rapidly reduced or failed. The composition of the nano cermet tool is: 53TiC-10TIN (laying)-18Mo-18Ni-1C, and the particle size of the TiN nanopowder is 30-50 nm. Experiments show that the peak values ​​of each mechanical property correspond to the amount of nano TiN added. According to the test of Hefei University of Technology, when the volume is 6% to 8%. Better overall physical and mechanical properties can be obtained. 4 Research ideas and prospects of ceramic tool materials According to the Hall-petch relationship, the smaller the grain size, the higher the hardness and strength of the ceramic material. When the grain size is as small as about 100 nm, there is a big breakthrough in strength and hardness. However, the activity of the nanopowder is very large, the activation energy of the interfacial reaction is low, and it is easy to grow up in the sintering process. Although the effect of adding the inhibitor is still not satisfactory, there is no report on the successful development of the nano-scale ceramic tool material. Nano-modification and nano-composite have successfully solved the problem of abnormal growth of crystal grains. The pinning of nano-sized particles or entering the dislocation region causes subgrain boundaries to form in the matrix grains, resulting in grain refinement of the matrix. The research and development of nano-modified, nano-composite and ultra-fine grain ceramic tool materials will be the main direction of tool material development in the future. Ceramic tool materials are one of the most promising high-speed cutting tool materials and have broad application prospects in production. At present, it has attracted the attention of all countries in the world. About 70% of the processing of castings in Germany is done with ceramic tools, and the annual consumption of Japanese ceramic tools accounts for 8% to 10% of the total tool. The development of ceramic knives in China is also very rapid, and the level of research and development is comparable to that of the international. The ceramic tool has a very high wear resistance, it has better chemical stability than the hard alloy, can be cut at high speed and lasts longer, and the average efficiency is 3-1 times higher than that of the carbide tool. . It realizes efficient "hard machining technology" and "dry cutting technology" by means of car grinding and milling, and improves the surface quality of parts. Achieving dry cutting has broad application prospects for controlling environmental pollution and reducing manufacturing costs. 5 Conclusion The new ceramic tool material has the advantage that other tool materials can't match, and its development space is very large. Through the study of ceramic tool material composition, preparation process and material design, it can greatly improve the toughness and impact resistance of tool materials while maintaining high hardness, high wear resistance and red hardness. Suitable materials required for technical use. It is expected that with the use of various new ceramic tool materials. It will promote the development of high-efficiency machine tools and high-speed cutting technology, and the promotion and application of high-efficiency machine tools and high-speed cutting technology will further promote the use of new ceramic tool materials. Previous page
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The rise of ceramic tool materials and analysis of its market development prospects (3)