Composite materials to fiber reinforced materials used the most widely, the largest amount. It is characterized by a small proportion, greater than the strength and modulus. For example, carbon fiber and epoxy resin composite material, its specific strength and specific modulus than steel and aluminum alloy several times, but also has excellent chemical stability, friction and wear resistance, self-lubricating, heat resistance, fatigue resistance Creep, muffler, electrical insulation and other properties. Graphite fiber and resin Composite Materials can be obtained with a coefficient of thermal expansion of almost zero material. Another feature of the fiber-reinforced material is anisotropy, so the arrangement of the fibers can be designed according to the strength requirements of the different parts of the article. Carbon fiber and silicon carbide fiber reinforced aluminum matrix Composite Materials, at 500 ℃ can still maintain sufficient strength and modulus.
Silicon carbide fiber and titanium Composite Materials, not only the titanium heat resistance, and wear resistance, can be used as the engine fan blades. Silicon carbide fiber and ceramic Composite Materials, the use of temperature up to 1500 ℃, than the use of super-alloy turbine blade temperature (1100 ℃) is much higher. Carbon fiber reinforced carbon, graphite fiber reinforced carbon or graphite fiber reinforced graphite, constitute an ablative material, has been used in spacecraft, rocket missiles and atomic energy reactors. Non-metallic matrix Composite Materials due to the small density, for cars and aircraft can reduce weight, improve speed, save energy. Composite Materials made of carbon fiber and glass fiber are the same, and their stiffness and load capacity are equivalent to 5 times more weight than steel leaf springs.
The molding method of the composite material varies according to the matrix material. The molding method of the resin-based composite material is more, such as hand-paste molding, jet molding, fiber winding molding, molding, pultrusion, RTM molding, hot-press forming, diaphragm molding, migration molding, reaction injection molding, Forming, stamping and so on. Metal matrix Composite Materials molding method is divided into solid phase forming method and liquid phase molding method. The former is below the melting point of the substrate temperature, through the application of pressure to achieve molding, including diffusion welding, powder metallurgy, hot rolling, hot drawing, hot and other static pressure and explosive welding. The latter is the matrix melting, filling into the reinforcement material, including the traditional casting, vacuum suction, vacuum back pressure casting, extrusion casting and casting, ceramic matrix Composite Materials molding methods are solid-phase sintering, chemical Vapor phase impregnation, chemical vapor deposition and so on.