Carbon fiber enhanced structure and knitting method used for composite material

Abstract

The invention discloses a carbon fiber enhanced structure and a knitting method used for composite material. The composite material is formed by following material comprising, by weight, from 55% to 55% of carbon fibers, from 18% to 25% of phenolic aldehyde and from 22.5% to 30% of chemigum. The composite material is 6 to 8mm thick. The carbon fibers are present in weft knitting structures. The knitting method comprises following steps: selecting specifications and models of carbon fibers according to thicknesses of knitted carbon fibers; choosing a computerized flat knitting machine to knit carbon fibers into weft knitting structures; spraying ethyl alcohol to carbon fibers during a knitting process; and controlling tension of fiber bundles from 2N to 36N. Due to the fact that the weft knitting structures are adopted by the carbon fibers, composite material helps to greatly improve the anti-ablative property of material and maintains elastomer characteristics required by thermal insulation material. After the composite material is used for a thermal insulation layer of an engine, the requirement for product quality is satisfied and quality fault of failure of the thermal insulation layer is completely solved; and applications to multiple products are achieved at present so that tests and examinations are passed.

Description

technical field [0001] The invention belongs to a method for preparing an engine heat insulating layer material, in particular to a carbon fiber reinforced structure and a knitting method for composite materials. Background technique [0002] In the preparation process of solid rocket motor insulation layer materials, in order to improve the anti-scour performance of the material, the usual practice is to add reinforcing materials to improve the anti-scour performance, such as asbestos, carbon fiber and aramid fiber, among which the effect of carbon fiber is most obvious. The currently widely used 5-Ⅵ material is chopped carbon fiber reinforced rubber-based composite material, and its ablation rate is less than 0.06mm / s, but problems such as material inhomogeneity, anisotropy, and poor surface stability are also applied. revealed in full. In order to solve these problems, carbon fiber can be woven into a continuous and uniform network structure to become a reinforcem...

AI Technical Summary

Problems solved by technology

At present, fiber weaving methods for reinforcing materials include plain weave, twill weave, satin weave carbon cloth, two-and-a-half-dimensional, three-dimensional braids, etc. These products do not have the elastomer properties required by the heat insulation layer forming process, and the elongation is relatively low. The elongation rate of the rubber airbag is all below 10%, and the pressure of the rubber airbag cannot be transmitted, resulting in bonding defects of the interlayer interface of the heat insulation layer and the interface of the heat insulation layer / shell

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