Development of cutting tool coating technology at home and abroad (3)
The current development of coating technology in the world has the following trend: since a single coating material is difficult to meet the requirements of improving the comprehensive mechanical properties of the tool, the coating composition will tend to be diversified and composited; to meet different cutting processing requirements, the coating composition It will be more complicated and more targeted; in the composite coating, the thickness of each single-component coating will become thinner and thinner, and will gradually become nano-sized; the coating process temperature will be lower and lower, and the tool coating process It will develop in a more reasonable direction, and PVD and MT-CVD processes are expected to become mainstream technologies. (1) The impact of the introduction of the previous phase on the follow-up development of domestic PVD technology The introduction of foreign PVD technology and equipment in the mid-1980s has made China's development of this technology a high starting point, and also solved the coating problem of high-speed steel tools. However, since the manufacturers of imported equipment are the backbone enterprises of domestic tool production (the domestic market share of their tool products is very high), the introduction of these advanced coating equipment has been able to meet the production requirements of these enterprises for a long time. Therefore, the demand for domestic PVD technology and equipment is not strong, which affects the application and development of domestic PVD equipment in the field of tool manufacturing to a certain extent; on the other hand, PVD technology is still in the early stage of development in the mid-1980s, with the The continuous development of the technology, after the 1990s, new technologies emerge one after another, the technology introduced by these enterprises in the early stage needs to be updated, but the expensive price makes it difficult for enterprises to introduce new technologies and new equipment again, so the country has missed the development and improvement of PVD technology. The best period. Previous Next
CVD technology status and development trend of China's development tool coating technology in China <br> <br> China from the early 1970s began to study CVD coating technology, due to the special nature of the technology is strong, the country engaged in research There are not many units. In the mid-1980s, the development of China's CVD tool coating technology reached a practical level, and the level of process technology was comparable to the international level at that time, but it developed slowly in the following ten years (similar to foreign research); At the end of the year, China began the research and development of MT-CVD technology. The research and development of MT-CVD process and equipment is expected to be basically completed in 2001. According to the research objectives, the process technology and equipment will reach the current international advanced level; the research of PCVD technology in China begins. In the early 1990s, PCVD process technology was mainly used for mold coating, and its application in the field of cutting tools is still very limited. In general, the overall development level of domestic CVD technology is not much different from the international level. After the successful development of MT-CVD technology, China's overall level in the field of tool CVD coating will be basically synchronized with the international advanced level.
Development <br> <br> PVD coating technology in China PVD technology, our research and development work began in the early eighties, the successful development of eight mid-sized hollow cathode ion plating, and the development of high-speed steel cutting tools TiN coating Process technology. During this period, due to the promising market prospects for cutting tool coatings, seven large tool factories in China introduced large PVD coating equipment from abroad (both high-speed steel TiN coating technology). The introduction of technology and equipment mobilized the development of domestic PVD technology. Many research institutes and major vacuum equipment factories have started the development of large-scale ion coating machines, and developed a variety of PVD coating equipment in the early 1990s. However, due to the low performance index of most equipment, the quality of the tool coating cannot be guaranteed, and the expected market benefits are not realized. Therefore, most companies have not further studied PVD tool coating technology, resulting in the domestic PVD tool coating for nearly ten years. The development of technology has stalled. Despite the successful development of the hard alloy TiN-TiCN-TiN multi-component coating technology in the late 1990s and reaching a practical level, the development of CNx coating technology has also made a major breakthrough, but compared with the international development level, China's tool PVD Coating technology is still about a decade behind. At present, foreign tool PVD coating technology has been developed to the fourth generation, while the domestic is still in the second generation level, and still dominated by a single layer of TiN coating.
Tool PVD coating technology development issues in China and the Countermeasure Analysis <br> <br> compared with foreign countries, the tool PVD coating technology in China started research and development is not too late, but also in the early stages of development was the introduction of a large number of internationally The most advanced coating equipment, the domestic coating equipment in the late 1980s has also developed rapidly, but the technology is widely used in high-speed steel tools in the mid-1990s. So far, although domestic research on TiCN coatings for cemented carbide tools has made breakthroughs, the coating products in the domestic market are still dominated by TiN coatings. Analysis of the reasons can be summarized as follows: