A relatively soft tool substrate coated with one or mor […]
A relatively soft tool substrate coated with one or more layers of hard and wear-resistant metal or nonmetallic compounds (such as TiAlN, TiC, TiN, Al2O3, etc.) and the formation of coating tools, cutting tools A revolution in development. Compared with uncoated tools, coated tools have obvious advantages: significantly reduce the friction coefficient, improve the tribological properties and chip removal ability of the tool surface; significantly improve the wear resistance and impact toughness, and improve the cutting of the tool Improve machining efficiency and tool life; improve the oxidation resistance of the tool surface, so that the tool can withstand higher cutting heat, help to improve the cutting speed and processing efficiency, and expand the scope of dry cutting applications. In the advanced manufacturing industry, more than 80% of carbide tools and high-speed high-speed steel tools are used surface coating technology, and more than 90% of cutting tools used on CNC machine tools are coated tools.
Since the advent of tool coating technology, tool technology improvements and processing technology has played an increasingly important role, has become the symbol of modern tools. Coated tools are obtained by coating a thin layer of refractory metal compounds with high wear resistance on hard carbide or high speed steel substrates, resulting in dramatic changes in tool performance. Commonly used coating materials are TiC, TiN, Al2O3, TiC hardness than TiN high, better wear resistance. Carbide, the general use of chemical vapor deposition (CVD), the lamination temperature of 1000 ℃; and high-speed steel cutting tools, the general use of physical vapor deposition (PVD), the lamination temperature of about 500 ℃. As the coating process matures and continues to evolve, a single coating from the beginning has entered a new phase of development of multiple, multi-layer, gradient, and nano-coatings.