Method for manufacturing needle-punched carbon fiber pseudo-three-dimensional preform

Abstract

The invention relates to a method for manufacturing a needle-punched carbon fiber pseudo-three-dimensional preform, which comprises the following steps: adopting alternating laminations of continuous carbon fibers and short carbon fiber mesh carcasses, wherein the laminations of the continuous carbon fibers are paved alternately with included angles between 0 and 30 degrees; and introducing longitudinal fortifying fibers through a needle-punching process in the axial direction of the short carbon fiber mesh carcasses and the continuous carbon fiber laminations, and controlling the needling density to between 36 to 44 needles/cm so as to manufacture a full carbon fiber pseudo-three-dimensional structural preform with the volume density of between 0.55 and 0.82g/cm. The preform manufactured by the method has the most important characteristics of high volume content of the carbon fibers, evener continuous carbon fiber laminations, high needling density, high mechanical property of a manufactured carbon/carbon composite material and good wear resistance, and is applicable to manufacturing aircraft carbon brake disc materials with high torque characteristics.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon brake disc prefabricated body materials for military aircraft and civil aircraft, and in particular relates to a method for manufacturing a quasi-three-way prefabricated body of needle-punched carbon fiber. Background technique [0002] Needled polyacrylonitrile preoxidized fiber preform or needled carbon fiber preform is a well-known material for making aircraft carbon brake disc preforms, but due to the differences in details, the performance of carbon brake disc materials varies greatly. s difference. [0003] Chinese invention patent ZL02138191.7 discloses a needle-punched non-woven fabric and a quasi-three-dimensional prefabricated body, which has been used in the prefabricated body of domestic B757-200 aircraft carbon brake disc material. However, there are two shortcomings in the process of use: one is that the layers of continuous carbon fiber non-weft cloth are laminated at...

AI Technical Summary

Problems solved by technology

However, there are two shortcomings in the process of use: one is that the layers of continuous carbon fiber non-weft cloth are laminated at an angle of 0° / 90°, and the angle of the layer is too large, resulting in low wear resistance of the carbon brake disc material. ; Second, the actual acupuncture density is low, the carbon fiber content in the longitudinal direction of the prefabricated body is relatively small, and the carbon brake disc material is delaminated due to low interlayer shear strength during high temperature treatment, resulting in product scrapping

[0004] National Defense Invention Patent 200710081372.1 relates to a preparation method of a high-density needle-needle low-density preform for aircraft carbon brake discs, which improves the needle punching density of the preform, but its disadvantages are that the volume density of the preform is low and the volume content of carbon fiber Insufficient, resulting in low mechanical properties of carbon brake disc materials