Tool coating technology in China after years of development, is currently in a critical period, that is, the original technology has been unable to meet the increasing requirements of cutting, domestic major tool factory coating equipment to be replacement period. Therefore, the tool coating technology at home and abroad to fully understand the present situation and development trend of advanced coating technology aiming at the international level, according to plans and steps to develop tool coating technology (especially the PVD technology), for improving the cutting tools and manufacturing standards in China have significance.

CVD technology development in China

China from the early seventies the twentieth century, began to study CVD coating technology, due to the technology-specific nature of a strong domestic research units are not many. The mid-eighties, China's development of CVD tool coating technology to achieve practical level, technology level and international level was equivalent, but in the next 10-odd years to develop a more slowly (and foreign research situation is similar); the late nineties period, China began to MT-CVD technology, R & D, MT-CVD process and equipment research and development is expected to be basically completed in 2001, according to research objectives, process technology and equipment will reach the international advanced level; PCVD technology research in China started in the early nineties, PCVD process technology is mainly used for mold coatings, cutting tools currently in the field of application is also very limited. Overall, the domestic level of the overall development of CVD technology, the gap between the international level is not until the MT-CVD technology is successfully developed, our tool CVD coating in the overall level of the field with the international advanced level will be essential to keep pace.

PVD technology development in China

China PVD coating technology research and development work began in the early eighties to the mid-eighties the successful development of small and medium sized hollow cathode ion plating machine, and the development of high-speed steel cutting tools TiN coating process technology. During this period, owing to the prospect of cutting tool coating market, the domestic total of seven major tool factory introduced from abroad a large-scale PVD coating equipment (TiN coating process are mainly high-speed steel). The introduction of technology and equipment to mobilize domestic PVD technology development boom, and many research institutes and large vacuum equipment factory have launched a large-scale ion plating machine development work, and in the early nineties to develop a variety of PVD coating equipment. However, much of the equipment performance is not high, can not guarantee the quality of tool coating, while the expected market benefits not realized, so most companies are not pairs of PVD tool coating technology for further in-depth study, resulting in nearly a decade of domestic PVD tool coating technology development standstill. Despite the late nineties has successfully developed China Carbide TiN-TiCN-TiN multi-composite coating process technology and achieve practical level, CNx coating technology R & D is also a major breakthrough, but compared to the level of international development, China's knives PVD coating technology is still behind about a decade. At present foreign Tool PVD coating technology has been developed to the fourth generation is still in the second-generation domestic level, and the single-layer TiN coating is still dominated.

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