Preparation method of high-temperature wave-transparent composite material toughened by hybrid-woven fibers

Abstract

The invention provides a preparation method of a high-temperature wave-transparent composite material toughened by hybrid-woven fibers. The preparation method comprises the following steps: (1), weaving boron nitride fibers, high silica fibers and quartz fibers into prefab forms in a hybrid manner by virtue of a weaving method or a knitting method, wherein the prefab types are 2.5-dimensional or 3-dimensional forms; (2), mixing phosphoric acid in a certain mass fraction with aluminum hydroxide, adding deionized water and sufficiently stirring until mixing uniformly, and standing for 2 hours-4 hours to prepare aluminum phosphate sol; (3), placing fiber prefabs in the prepared aluminum phosphate sol, and sufficiently impregnating; (4), placing the fiber prefabs impregnated by the aluminum phosphate sol into an oven for carrying out a thermal-treatment drying process; (5), placing a dried composite material at 700 DEG C-900 DEG C for sintering and treating for 1 hour-2 hours; and (6), repeating the processes in step (3) to step (5) for 5-7 times to prepare the compact composite material. According to the invention, the technical process is relatively simple, easy to operate and low in cost; and the prepared composite material has very good high temperature resistance and wave-transparent performance.

Description

technical field [0001] The invention relates to a method for preparing a wave-transmitting composite material, in particular to a method for preparing a high-temperature wave-transmitting composite material reinforced by mixed braided fibers. Background technique [0002] High-temperature wave-transparent material is a dielectric material with both high-temperature resistance and wave-transparency properties. It is the basis for high-speed precision navigation spacecraft and one of the indispensable key technologies for the development of hypersonic surface-to-air missiles, anti-radiation missiles and cruise missiles. , which directly restricts the development of advanced spacecraft. Aerodynamic friction heating during high-speed flight can cause enormous thermal stress on the aircraft, especially the aircraft radome material. In order to withstand various loads, the strength of the aircraft radome material must be relatively high, and the material must have good fracture t...

AI Technical Summary

Problems solved by technology

The dielectric constant of quartz ceramics is very stable to frequency and temperature, and has good thermal shock resistance. However, due to its high porosity, it is easy to absorb moisture and has poor rain erosion resistance.