Performance and molding method of composite core foam:
Fiber-reinforced materials are the most widely used and largest amount of composite core foam. Its characteristics are small specific gravity, large specific strength and specific modulus. For example, carbon fiber and epoxy resin composite materials have specific strength and specific modulus that are several times greater than steel and aluminum alloys. Creep, noise reduction, electrical insulation and other properties. Composite of graphite fiber and resin can obtain a material with an expansion coefficient 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 product.
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 is compounded with titanium, which not only improves the heat resistance of titanium, but also resists abrasion, and can be used as an engine fan blade. Silicon carbide fiber and ceramic composite, the use temperature can reach 1500 ℃, much higher than the use temperature of super alloy turbine blades (1100 ℃). Carbon fiber-reinforced carbon, graphite fiber-reinforced carbon, or graphite fiber-reinforced graphite constitute an ablation-resistant material and have been used in spacecraft, rocket missiles, and atomic energy reactors. Because of its low density, non-metal-based composite materials can be used in automobiles and airplanes to reduce weight, increase speed, and save energy. The composite core material foam plastic leaf spring made by mixing carbon fiber and glass fiber has a stiffness and load carrying capacity equivalent to that of a steel leaf spring that is more than five times heavier.
Molding method: It varies according to the base material. There are many molding methods for resin-based composite materials, including hand lay-up molding, injection molding, fiber winding molding, compression molding, pultrusion molding, autoclave molding, diaphragm molding, migration molding, reaction injection molding, soft film expansion molding, and stamping. Molding, etc. Metal matrix composite molding methods are divided into solid phase molding and liquid phase molding. The former is achieved by applying pressure at a temperature below the melting point of the substrate, 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, extrusion casting and spray casting, etc., ceramic matrix composite core foam molding methods, mainly solid Phase sintering, chemical vapor infiltration molding, chemical vapor deposition molding, etc.