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Preparation method for oxide fiber toughened silicon dioxide ceramic-based composite material gap interface

A composite material and silica technology, which is applied in the field of preparation of oxide fiber toughened silica ceramic matrix composite material gap type interface, can solve the problems affecting the mechanical properties of fibers, glass fiber and quartz fiber damage, etc., to achieve fiber Low degree of damage, low preparation temperature, and the effect of improving toughness

Active Publication Date: 2014-07-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantage: Difficult to obtain a uniform, bridging-free coating on bundled or braided fiber preforms
[0006] Whether it is LaPO 4 For C coating, the preparation temperature needs to be around 900°C, which will cause fatal damage to glass fibers and quartz fibers, and seriously affect the mechanical properties of fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) First, add an appropriate amount of C 60 Dissolve in toluene until reaching a saturated solution;

[0026] (2) The oxide fiber is selected as a three-dimensional braided quartz fiber prefabricated part. Put it into a saturated solution, fully impregnate it, let it stand for 5 minutes, then take out the fiber preform and place it in an air atmosphere at 30°C until the toluene is completely volatilized;

[0027] (3) Put the quartz fiber prefabricated part in the saturated solution again, after being completely impregnated, take it out after 1 minute, place it in an air atmosphere at 30°C until the toluene is completely volatilized, repeat this cycle 3 times, at this time, the quartz fiber prefabricated part The surface is covered with a large amount of C 60 ;

[0028] (4) Put the quartz fiber preform into silica sol with a concentration of 5% for impregnation, pump the air pressure in the impregnation tank to negative pressure, and use the negative pressure to suck...

Embodiment 2

[0032] (1) First, add an appropriate amount of C 60 Dissolve in 2L xylene until reaching a saturated solution;

[0033] (2) The oxide fiber is selected as a two-dimensional braided alumina fiber prefabricated part, which is placed in a saturated solution, fully impregnated, and left to stand for 8 minutes, then the fiber prefabricated part is taken out, and placed in an air atmosphere at 30 °C to wait Xylene is completely volatile;

[0034] (3) Place the alumina fiber prefabricated part in the xylene solution. After being completely immersed, take it out after 2 minutes, and place it in an air atmosphere at 35°C until the xylene is completely volatilized. Repeat this cycle 3 times. At this time, the alumina fiber The surface of the fiber preform is covered with a large amount of C 60 ;

[0035] (4) Put the alumina fiber preform into the silica sol with a concentration of 10% for impregnation, pump the air pressure in the impregnation tank to negative pressure, and use the n...

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PUM

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Abstract

The invention discloses a preparation method for an oxide fiber toughened silicon dioxide ceramic-based composite material gap interface. The preparation method is characterized by comprising the following steps of: preparing an interface layer of C60 on the surface of an oxide fiber or a fiber prefabricated part, wherein through repeated silica gel steeping thermal treatment process cycles, the interface layer of C60 is still kept between the fiber and a silicon dioxide substrate; performing a sintering process to oxidize the C60 to generate carbon dioxide for volatilizing; thus forming a gap between the fiber and the silicon dioxide substrate, wherein the gap is a weak bonding interface which contributes to crack deviation and fiber extraction. According to the method, the toughness of an oxide fiber toughened silicon dioxide ceramic-based composite material is enhanced.

Description

technical field [0001] The invention relates to a method for preparing a gap-type interface of a ceramic matrix composite material, in particular to a method for preparing a gap-type interface of an oxide fiber toughened silica ceramic matrix composite material. Background technique [0002] The oxide fiber toughened silica ceramic matrix composite material is a multifunctional wave-transparent radome material with excellent properties such as high temperature resistance, ablation resistance, load bearing, and wave transmission. In order to meet the requirements of modern aerospace technology for high Mach number and large-scale radome materials, the mechanical properties of oxide fiber toughened silica ceramic matrix composites must be improved, especially the toughness must be improved. The weakly bonded interface between the fiber and the matrix can generate energy dissipation mechanisms such as crack deflection and fiber pull-out, thereby enhancing the toughness of the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/82C04B35/622C04B35/14
Inventor 陈照峰刘勇朱建勋蒋云林龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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