Carbon-fiber needled preformed body with gradiently-changed body density

Abstract

The invention discloses a carbon-fiber needled preformed body with gradiently-changed body density. The preformed body is formed by continuously needling three layers of carbon-fiber needled preformed bodies in a multi-angle and layer-by-layer crossed manner, wherein the density of the preformed body at a middle layer is larger than the densities of the preformed bodies at an upper layer and a lower layer, and each preformed body is formed by compositing a layer of weftless carbon cloth paved in a 0-degree / 90-degree angle with a layer of mesh tire and continuously needling in the layer-by-layer manner. The preformed body has the advantages of short preparation cycle and low production cost in carbon / carbon sedimentation technological process, and a carbon / carbon composite material produced from the preformed body has excellent performances of wear resistance, high temperature resistance, low expansion coefficient, high heat conductivity, good heat shock resistance, light weight and the like. The high-performance carbon-fiber needled preformed body is a novel functional composite structure product and has wide application prospects in the fields of aviation, space flight, civil construction, military and the like due to the specific structure and advanced production process.

Description

Technical field [0001] The invention relates to a method for preparing a felt body, in particular to a carbon fiber needle-punched prefabricated body with a gradient change in bulk density. Background technique [0002] High-performance carbon fiber needle-punched prefabricated body, after high-tech carbon / carbon deposition process, has properties such as friction resistance, high temperature resistance, and light weight. New materials widely used in human and other fields. [0003] The original structure of the carbon fiber prefabricated body is a prefabricated body with constant density made of carbon fiber non-weft cloth and carbon fiber net tire through multi-layer needle punching. The process steps mainly include: 1. Carding the short fibers produced at 50-60mm to a thickness of 1-2mm and an area density of 40-600g / m 2 Mesh tire: 2. Composite the mesh tire and carbon fiber, and continuously needling to form a three-dimensional prefabricated body. [0004] The above-m...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned technical deficiencies, the present invention provides a carbon fiber needle-punched preform whose inner layer density is higher than that of the outer layer. The carbon fiber needle-punched preform facilitates the reaction gas from inside to outside in the preform in the subsequent deposition process. Deposition can effectively solve the problem that the pores on the surface of the preform are easily closed, which not only ensures the high density and uniformity of the product, but also greatly shortens the preparation cycle, thereby greatly reducing the production cost

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