▎ 摘　　要

NOVELTY - Mixed fiber preform reinforced composite material comprises e.g. a fiber preform which is three-dimensional fabric woven by 2-5 kinds of fibers, a composite interface and a substrate, where the fiber volume fraction in the preform is 35-65 vol.%, volume fraction of the single fiber in the perform is 5-60 vol.%, layer number of the fiber cloth or felt in the preform is 2-5 layers, each having a thickness of 0.5-50 mm, and the three-dimensional overall structure is formed between the layers by needle stitching, resin binding, yarn feeding and shallow cross-linking, and the fibers are woven by loom temples during the weaving process. The outer layer of the wave-transmitting composite material is quartz fiber, and inner layer is high silica fiber or glass fiber; the outer layer of the absorbing composite material is oxide fiber, the middle layer is silicon carbide fiber, and the inner layer is carbon fiber. The outer layer of high temperature structural material is silicon carbide fiber. USE - The mixed fiber preform reinforced composite material is useful in three-dimensional mixed-woven polyimide reinforced polyformaldehyde composite material. ADVANTAGE - The mixed fiber preform reinforced composite material has high strength, high temperature resistance, heat insulation, and wave-absorbing function, and improved composition and structure. The composite material is light weight, high strength and multifunctional, and can be easily and economically manufactured with high productivity. DETAILED DESCRIPTION - Mixed fiber preform reinforced composite material comprises a fiber preform which is three-dimensional fabric woven by 2-5 kinds of fibers, a composite interface and a substrate, where the fiber volume fraction in the preform is 35-65 vol.%, the volume fraction of the single fiber in the perform is 5-60 vol.%, the layer number of the fiber cloth or felt in the preform is 2-5 layers, each having a thickness of 0.5-50 mm, and the three-dimensional overall structure is formed between the layers by needle stitching, resin binding, yarn feeding and shallow cross-linking, and the fibers are woven by loom temples during the weaving process. The outer layer of the wave-transmitting composite material is quartz fiber, and the inner layer is high silica fiber or glass fiber; the outer layer of the absorbing composite material is oxide fiber, the middle layer is silicon carbide fiber, and the inner layer is carbon fiber. The outer layer of high temperature structural material is silicon carbide fiber, and the inner layer is carbon fiber. The outer layer of the thermal insulation composite material below 1400 degrees C is silicon carbide fiber, the middle layer is carbon fiber and alumina fiber, and the inner layer is glass fiber. The outer layer of the heat-proof composite material above 1400 degrees C is carbon fiber, the middle layer is silicon carbide fiber, alumina fiber, and quartz fiber, and the inner layer is high silica fiber. The ceramic powder is silicon carbide, boron carbide, zirconium carbide, tantalum carbide, hafnium carbide, silicon nitride, boron nitride, silicon oxide, calcium oxide, yttrium oxide, zirconium oxide or aluminum oxide. The interface is fullerene, graphene, pyrolytic carbon, silicon carbide, boron nitride and oxide interface. The substrate is resin, light alloy, carbon and ceramic. An INDEPENDENT CLAIM is also included for preparing mixed fiber preform reinforced composite material.