Coating is one of the most important ways to improve the performance of the tool. The cutting performance of the tool has made a major breakthrough with the advent of tool coating. Apart from cutting performance, the machining efficiency, accuracy, service life can also be increased by tool coating. Since the 1970s, tool coating technology has developed rapidly and the coating process has become more mature. The proportion of coated inserts among indexable inserts in Western industrialized countries has increased from 26% in 1978 to 50-60% in 1985. About 80% of the cutting tools used in the new CNC machine tools are coated. The proportion of coated cemented carbide inserts on CNC machine tools in the United States is 80%, and coated blades for turning in Sweden and Germany account for more than 70%. Tool coating ha become an important symbol of modern tools and will be one of the most important tool types in the field of CNC machining in the future. As a new coating material, TiAlN coating has excellent properties such as high hardness, high oxidation temperature, good thermosetting, strong adhesion, low friction coefficient and low thermal conductivity. It is especially suitable for high-speed cutting of high alloy steel, stainless steel, nickel alloy and other materials. In the case which requires high wear resistance, TiAlN is expected to partially or completely replace TiN due to the defects of TiN coating in high temperature environment. Therefore, TiAlN coated tools have extremely broad application prospects. Since Knotek et al. first published research results on TiAlN coatings in 1985, people have expressed great interest about their excellent resistance to high temperature oxidation and good performance. TiAlN films have been successfully prepared by various physical vapor deposition (PVD) methods, including evaporation, sputtering and ion plating.
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