TiCl4+CH4+H2TiC+4HCl+H2
The TiC formed during the chemical reaction is deposited on the surface of the substrate. However, it has been found that in the process of chemical vapor deposition of TiC coating, the following reactions are carried out:
TiCl4+C+2H2TiC+4HCl
The result of the reaction will result in decarburization at the surface of the coating matrix, thereby forming a brittle η phase between the coating and the substrate, adversely affecting the coating tool material. In order to avoid the formation of brittle η phase between the coating and the substrate during the chemical vapor deposition of TiC, usually in the preparation of the gradient alloy matrix, a small amount of graphite phase is formed on the surface of the alloy matrix by a reasonable controlled preparation process. It is eliminated by reacting with TiCl4 and H2 in the subsequent chemical vapor deposition process. In this way, the cemented carbide tool material has neither graphite phase nor brittle η phase between the coating and the substrate after chemical vapor deposition, and the metallurgical bond between the coating and the substrate is enhanced, and the cemented carbide coating tool is improved. The performance of the material.
Conclusion In the 21st century, China will become the center of the world's manufacturing industry. Carbide tools, as an important tool for manufacturing, face enormous opportunities and challenges. The development of advanced manufacturing technology, the large-scale use of high-performance CNC machine tools, new workpiece materials continue to emerge, requiring tools with high efficiency, high precision, high reliability and specialization. Obviously, there is still a certain gap between the current status of cemented carbide tools in China and this requirement. This is the contradiction between China's rapidly developing manufacturing industry and the backward tool industry. We must conscientiously learn from the management experience and advanced technology of foreign tool companies, introduce the manufacturing technology of digesting and absorbing foreign tools, and continue to innovate and develop specialized, refined, special and new products with Chinese characteristics, so that Chinese tools can catch up as soon as possible. The world's advanced level.
The coating grade cemented carbide tool has excellent performance, and has a large application field and a broad prospect. In order to obtain a well-performing coating grade cemented carbide product, the preparation of a gradient alloy matrix is ​​a critical issue in addition to selecting the coating material and controlling the coating process. At present, researchers at home and abroad have carried out some useful research and exploration on the thermodynamics and gradient formation mechanism of the gradient cemented carbide coating matrix preparation process, but these studies are still preliminary, and there are still some limitations, which need further research.
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Heating Cooling Circulation Machine
Lab heating cooling machine also named heater and cooler which comebine heater and cooler into one machine then provide heating cooling source
lab heating cooling machine also is named heating cooling circulation bath for heating and cooling
Chemical heater and cooler or heating cooling machine is always used for jacketed glass reactors for heating and cooling circulation transfer in the jacket space
Lab heating cooling machine GDX Series lab equipments, it can provide high tempeature at 200c and minimum temperature as client request
Heating And Cooling, heater cooler lab ,heating cooling machine Manufacturer in China
Zhongyi Kori(Zhengzhou)Equipment Co.,Ltd , https://www.korireactor.com