The core material foam plastic is the most widely used and the largest amount of fiber reinforced materials. It is characterized by small specific gravity, large specific strength and specific modulus. For example, carbon fiber and epoxy resin composite materials have specific strength and specific modulus several times larger than steel and aluminum alloys. They also have excellent chemical stability, friction reduction, wear resistance, self-lubrication, heat resistance, fatigue resistance, and Creep, noise reduction, electrical insulation and other properties.
The composite of graphite fiber and resin can obtain a material whose expansion coefficient is almost equal to zero. Another feature of fiber reinforced materials is anisotropy, so the fiber arrangement can be designed according to the strength requirements of different parts of the part. The aluminum-based composite material reinforced with carbon fiber and silicon carbide fiber can still maintain sufficient strength and modulus at 500°C. 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.
The silicon carbide fiber is compounded with ceramics, and the service temperature can reach 1500℃, which is much higher than the service temperature of super alloy turbine blades (1100℃). Carbon fiber-reinforced carbon, graphite fiber-reinforced carbon or graphite fiber-reinforced graphite constitutes ablation-resistant material and has been used in spacecraft, rockets, missiles, and atomic energy reactors. Due to its low density, non-metal matrix composite materials can reduce weight, increase speed, and save energy when used in automobiles and airplanes.
The composite core foam plastic leaf spring made of a mixture of carbon fiber and glass fiber has the same stiffness and load-bearing capacity as a steel leaf spring that is more than 5 times heavier. Molding method: varies according to the base material. There are many molding methods for resin-based composite materials, including hand lay-up molding, injection molding, filament winding molding, compression molding, pultrusion molding, autoclave molding, diaphragm molding, migration molding, reaction injection molding, soft film expansion molding, and stamping Molding and so on.
The metal matrix composite material forming method is divided into solid phase forming method and liquid phase forming 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 back pressure casting, squeeze casting and injection casting, etc., ceramic matrix composite core foam molding methods, mainly solid Phase sintering, chemical vapor infiltration molding, chemical vapor deposition molding, etc.