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Silicon Carbide
Silicon Carbide - Image 2
Silicon Carbide - Image 3

They are used more for operation with wear at low temperature than for high temperature behavior. SiC applications are such as sandblasting injectors, automotive water pump seals, bearings, pump components, and extrusion dies that use high hardness, abrasion resistance, and corrosion resistance of carbide of silicon.High-temperature structural uses extend from the rocket injector grooves to the furnace rollers and the combination of high thermal conductivity, hardness and high temperature stability makes the components of the exchanger tubes of silicon carbide heat.

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Silicon carbides for structural use can be classified as: Sintered, bonded by reaction, liquid phase, and sintered solid state. SiC4 bonded by reaction is a compound of a continuous matrix of SiC having silicon from 5 to 20%, and metal that fills the remaining volume. To form this material, a powder preform containing coal is added as a powder or as the decomposition product of a resin from the carbon source, is infiltrated with silicon around 1500 ° C with direct contact or using silicon vapor.
The silicon reacts with the carbon preform to form a structure that bridges the SiC. The remaining silica excess fills the residual pore space and gives a completely dense product that has structural integrity up to 1370 ° C. The silicon melts at 1410 ° C. The preform can be manufactured by any of the traditional ceramic processes. On the other hand, the low temperatures (1500 ºC) used during the linking by reaction, combined with the flexibility of size and purity of the powder, provide a good quality product with a reasonable cost.