Traditional cutting tools are difficult to meet the needs of high-speed and high-efficiency cutting due to the shortcomings of serious friction and wear and short life. Therefore, depositing diamond coatings on cemented carbide substrates has become an effective method to improve or solve these problems. Diamond-coated carbide tools are ideal for high-efficiency and high-precision machining of non-ferrous metals and alloys, metal composite materials, and hard and brittle non-metallic materials such as ceramics, graphite, and reinforced plastics. Real-world applications have shown that diamond-coated cemented carbide greatly increases tool life compared to solid alloys. At the same time, due to the low cost and high performance of thin-film diamond-coated cutting tools, they have great potential in commercial applications.
Compared with polycrystalline diamond (PCD) tools, CVD nano-diamond tools have the advantages of simple preparation process and can be made into various complex geometric shapes, but are limited by the disadvantage of poor adhesion between the diamond film and the cemented carbide substrate. The large-scale industrial application of CVD nano-diamond coating tools.
In recent years, with the in-depth development of research, great progress has been made in the problem of adhesion between substrates and films, and the development of nano-diamond coating tools with flat surfaces and no need for sharpening has made people turn their attention to nano-diamond coating. A study of layer cutters.
CVD nano-diamond coated tools not only have the strength and toughness of cemented carbide, but also have the advantages of smooth and smooth surface of nano-diamond, low friction coefficient and easy grinding and polishing. However, from the perspective of development level, the research of nano-diamond coating at home and abroad is still in the basic research stage, and there are still many key problems to be solved, such as the low deposition efficiency of nano-diamond coating, low coating adhesion, thin film The quality has been further improved. The application research of nano-diamond coating has just started, and a mature product has not yet been formed, and there is still a long way to go for industrialization. However, with the development of the new nano-diamond composite coating technology, it can not only greatly improve the service life of molds and tools, effectively reduce costs and improve production efficiency, but also fundamentally improve the processing quality and product quality. application prospects.
Since the CVD nano-diamond coating enhances the flatness of the tool surface through secondary nucleation, it has a very broad application prospect in practical production. Although the CVD nano-diamond coating process is unstable and immature, with the continuous efforts of scientific researchers, it is believed that in the near future, the CVD nano-diamond coating will make great progress in technology, equipment and process. With the strengthening of energy saving awareness and the promotion of green economy, the application prospect of CVD nano-diamond coating will be very broad.
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