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

A fiber toughening, composite material technology, applied in the field of high temperature wave-transmitting composite material preparation, can solve the problems of poor rain erosion resistance, easy moisture absorption, high porosity, and achieve high temperature resistance and wave transmission performance, low cost , Easy to operate effect

Active Publication Date: 2014-03-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dielectric constant of quartz ceramics is very stable to frequency and temperature, and has good thermal sh...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Boron nitride fiber, high silica fiber and quartz fiber are mixed into a prefabricated form by weaving or braiding. The prefabricated part type can be 3D weaving, and the fiber volume fraction is controlled at 40%. After mixing In the prefabricated part, the boron nitride fiber is located in the outermost layer, the middle layer is high silica fiber, the innermost layer is quartz fiber, and the thickness ratio of the outer, middle and inner layers of fibers is 1:1:1;

[0020] (2) Mix a certain mass fraction of phosphoric acid and aluminum hydroxide, and add deionized water, fully stir until uniformly mixed, and after standing for 34 hours, aluminum phosphate sol is obtained, wherein the molar ratio of phosphoric acid and aluminum hydroxide is controlled to 1 ;

[0021] (3) Place the fiber preform in the prepared aluminum phosphate sol, fully impregnate, and the impregnation pressure is 4MPa;

[0022] (4) Place the fiber prefabricated parts impregnated with aluminum...

Embodiment 2

[0026] (1) Boron nitride fiber, high silica fiber and quartz fiber are mixed into a prefabricated form by weaving or weaving. The type of prefabricated part is 2.5-dimensional weaving, and the fiber volume fraction is controlled to 35%; after mixing In the prefabricated part, the boron nitride fiber is located in the outermost layer, the middle layer is high silica fiber, the innermost layer is quartz fiber, and the thickness ratio of the outer, middle and inner layers of fibers is 1:1:3;

[0027] (2) Mix a certain mass fraction of phosphoric acid and aluminum hydroxide, and add deionized water, stir until uniformly mixed, and after standing for 2 hours, aluminum phosphate sol is obtained, wherein the molar ratio of phosphoric acid and aluminum hydroxide is controlled to be 1.1 ;

[0028] (3) Place the fiber preform in the prepared aluminum phosphate sol, fully impregnate, and the impregnation pressure is 5MPa;

[0029] (4) Place the fiber prefabricated parts impregnated with...

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/447C04B35/624C04B35/64
Inventor 陈照峰刘勇朱建勋李斌斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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