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Carbon carbon composite material has a series of advantages under the high thermal condition,and it’s widely used in the aerospace field,however,the material will be oxidized rapidly in the aerobic conditions when the tempterature above 400 centigrade,and it will limit the using as the structure parts,protection material etc. And the coating technology is the good method to solve this problem. SiC,ZrC material,as they have high melting point and good stable property under high tempterature, so they become the ideal material of protecting coating of carbon carbon composite material. It can use the low pressure chemical vapor deposition(LPCVD) method to make the SiC coating and ZrC coating on the surface of carbon fiber and the inside C/C composite material. The different methods…
Graphite cut gasket is from pure graphite plate punching or cutting into the, it has good corrosion resistance, resistant high / low temperature, good compression elasticity and high strength, a variety of circular complex geometric gasket is widely used in pipes, valves, pumps, pressure vessels, heat exchanger, condenser and generator, air compressor, exhaust pipe, a refrigerating machine. raw material . expandable graphite (flexible graphite) produced by chemical treatment and 1000 DEG C high temperature treatment of pure natural graphite, this material provides excellent heat resistance and chemical resistance, good pad with high elasticity and low ductility characteristics. Second, characteristics: 1, in the extremely low temperature to 400 DEG C temperature range of sealing performance remained almost unchanged 2, almost of…
Tubular graphite heat exchangers have various tube plate material, the graphite tube plate, stainless tube plate and titanium tube plate and carbon steel tube plate (needing anti-corrosion treatment) ,these several tube plate material have the advantages and disadvantages in the application of the soda ash, let’s explore it in the following several aspects . The Comparison of corrosion resistance. Corrosion in soda production is still quite strong, especially in the ammonium chloride section containing NH4 +, Cl -, CO32 -, Na + corrosive mediumthe of united alkali production , the corrosion resistance requirements for equipment is more higher. Graphite is widely used in chemical production because of its excellent corrosion resistance, especially the corrosion resistance for CL-. Stainless steel also…
