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Fiber-reinforced silicon dioxide heat-insulating ceramic material and preparation method and application thereof

A silica and fiber reinforced technology is applied in the field of thermal insulation ceramic materials, which can solve the problems of unsuitable weight reduction requirements for aircraft, reduced porosity of composite materials, poor thermal insulation effect, etc., and achieves good thermal insulation effect. The effect of sufficient bonding and high porosity

Active Publication Date: 2019-02-26
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the direction of the fiber-reinforced silica composite materials prepared at present is high-density and high-strength materials. Through continuous densification, higher compressive strength is achieved to meet the load-bearing requirements, but the porosity of the composite materials is reduced. , the heat insulation effect becomes worse, and the heat insulation performance of the material is sacrificed to a certain extent
Studies have shown that among the same type of ceramic materials, materials with lower density generally have better heat insulation effect, and at the same time, the compressive strength has a certain decrease
In addition, materials that are too dense have a relatively high weight under the same volume, and are not suitable for the aerospace industry's demand for aircraft weight reduction.

Method used

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  • Fiber-reinforced silicon dioxide heat-insulating ceramic material and preparation method and application thereof
  • Fiber-reinforced silicon dioxide heat-insulating ceramic material and preparation method and application thereof
  • Fiber-reinforced silicon dioxide heat-insulating ceramic material and preparation method and application thereof

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preparation example Construction

[0038] The invention provides a preparation method of a fiber-reinforced silica heat-insulating ceramic material, such as figure 1 Shown, described preparation method comprises:

[0039] (1) Preparation of preform

[0040] The preform (that is, the fiber preform) can be made by processing fibers (such as fiber yarn) through weaving or needle punching. In order to ensure the effect of impregnation, the processed preform can also be pretreated to remove the wetting agent, so as to obtain a preform for impregnation with good surface wettability. The pretreatment can be completed with an organic solvent, and the organic solvent can use existing products, such as acetone, ethanol, chloroform, etc., which are not listed in the present invention.

[0041] The present invention preferably adopts a preform with a fiber volume content of 20-40%, for example, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% , 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%. For the preform, the...

Embodiment 1

[0063] The quartz fiber is processed into a preform with a fiber volume content of 20% by mechanical needle punching, and the sizing agent is removed by an organic solvent (acetone is used in this example) to obtain a preform for impregnation with good surface wettability, which is used for Subsequent impregnation step.

[0064] The density is 1.28g / cm 3 The preform is impregnated with silica sol by vacuum / pressure impregnation method, the preform is filled with filler and densified, and then the sol-gel reaction is carried out, so that the cross-linking between the gel and the preform is gradually integrated, and the control of the first The secondary sol-gel reaction temperature is 70°C, the time is 36h, no gelling aid is added; the density is 1.16g / cm 3 The preform is impregnated with silica sol by vacuum / pressure impregnation method, and then sol-gel reaction is carried out, the temperature of the second sol-gel reaction is controlled at 90°C, the time is 36h, and the add...

Embodiment 2

[0068] The quartz fiber is processed into a preform with a fiber volume content of 20% by mechanical needle punching, and the sizing agent is removed by an organic solvent (acetone is used in this example) to obtain a preform for impregnation with good surface wettability, which is used for Subsequent impregnation step.

[0069] The density is 1.28g / cm 3 The preform is impregnated with silica sol by vacuum / pressure impregnation method, the preform is filled with filler and densified, and then the sol-gel reaction is carried out, so that the cross-linking between the gel and the preform is gradually integrated, and the control of the first The secondary sol-gel reaction temperature is 70°C, the time is 36h, no gelling aid is added; the density is 1.16g / cm 3 The preform is impregnated with silica sol by vacuum / pressure impregnation method, and then the sol-gel reaction is carried out. The temperature of the second sol-gel reaction is controlled at 90°C, the time is 36h, and 2wt...

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Abstract

The invention relates to a fiber-reinforced silicon dioxide heat-insulating ceramic material and a preparation method and application thereof. The preparation method comprises the following steps: (1), preparing a preform; (2), performing multiple sol-gelation treatment: impregnating the preform with silica sol, then gelating to complete once sol-gelation treatment, repeating the sol-gelation treatment for multiple times, and sequentially reducing the density of the silica sol for impregnation to form gradient impregnation; (3), drying a material treated in the step (2) to obtain a blank; (4),sintering the blank to obtain the fiber-reinforced silicon dioxide heat-insulating ceramic material. By the preparation method, the heat-insulating ceramic material with high compressive strength andlow heat conductivity can be prepared; the heat-insulating ceramic material can be applied to an aircraft heat insulating system.

Description

technical field [0001] The invention relates to the technical field of heat-insulating ceramic materials, in particular to a fiber-reinforced silica heat-insulating ceramic material and a preparation method and application thereof. Background technique [0002] Fiber (such as quartz fiber) reinforced silica composite material is a multifunctional composite material developed in recent years that can simultaneously meet the functions of heat insulation, wave transmission, and load bearing. It has good heat insulation performance and compressive strength. High, small thermal expansion coefficient, low density and other advantages, widely used in the aerospace field. At present, fiber-reinforced silica composites mainly focus on their application in the field of load bearing or wave transmission, and less research on their application in the field of heat insulation. Due to the certain rigidity of fiber-reinforced silica composite materials, compared with thermal insulation ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/622C04B35/624C04B35/80
CPCC04B35/14C04B35/622C04B35/624C04B2235/5256C04B2235/9607C04B2235/96C04B2235/77
Inventor 张冰清杨小波吴焘苗镇江王华栋孙志强崔凤丹张剑李淑琴于长清吕毅
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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