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Composite materials‘ properties

Views: 6     Author: Site Editor     Publish Time: 2022-08-31      Origin: Site

Properties of composites materials

Fiber reinforced materials are the most widely used and used in composite materials. It is characterized by small specific gravity, large specific strength and specific modulus. For example, the composite material of carbon fiber and epoxy resin has several times higher specific strength and specific modulus than steel and aluminum alloy, and also has excellent chemical stability, friction reduction and wear resistance, self lubrication, heat resistance, fatigue resistance, creep resistance, noise elimination, electrical insulation and other properties. best activated carbon for air purification - Jiatecairfilter

The composite of graphite fiber and resin can obtain a material with thermal expansion coefficient almost equal to zero. Another characteristic of fiber reinforced materials is anisotropy, so the arrangement of fibers can be designed according to the strength requirements of different parts of the product. The aluminum matrix composites reinforced with carbon fiber and silicon carbide fiber can still maintain sufficient strength and modulus at 500 ℃. Silicon carbide fiber and titanium composite, not only improve the heat resistance of titanium, but also wear resistance, and can be used as engine fan blades. Silicon carbide fiber and ceramic composite, the service temperature can reach 1500 ℃, much higher than the service temperature of super alloy turbine blade (1100 ℃). Carbon fiber reinforced carbon, graphite fiber reinforced carbon or graphite fiber reinforced graphite constitute ablation resistant materials and have been used in spacecraft, rocket missiles and atomic energy reactors. Because of its low density, nonmetallic matrix composites can be used in automobiles and aircraft to reduce weight, improve speed and save energy. The stiffness and bearing capacity of composite leaf springs made of carbon fiber and glass fiber are equivalent to that of steel leaf springs with a weight of more than 5 times.

Forming method of composite materials

The forming methods of composite materials are different according to the matrix materials. There are many molding methods for resin matrix composite materials, including hand paste molding, spray molding, fiber winding molding, molding, pultrusion molding, RTM molding, hot pot molding, diaphragm molding, migration molding, reaction injection molding, soft film expansion molding, and stamping molding. The molding methods of metal matrix composites are divided into solid-phase molding method and liquid-phase molding method. The former is formed by applying pressure at a temperature lower than the melting point of the matrix, including diffusion welding, powder metallurgy, hot rolling, hot drawing, hot isostatic pressing and explosive welding. The latter is to melt the matrix and fill it into the reinforcement material, including traditional casting, vacuum suction casting, vacuum reverse pressure casting, squeeze casting and spray casting. 

The forming methods of ceramic matrix composites mainly include solid-phase sintering, chemical vapor infiltration molding and chemical vapor deposition molding.

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