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High temperature-resistant quartz fiber reinforced silica-based composite material, and preparation method and application thereof

A technology of quartz fiber and silica, applied in the field of composite materials, can solve the problems of decreased tensile strength, cracks on the fiber surface, poor tensile strength, etc., and achieve high temperature resistance, high temperature resistance and high stability Effect

Active Publication Date: 2018-11-30
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the maximum long-term service temperature of this material is only 1000-1100°C, and the tensile strength of the composite material is poor at 1200°C, generally around 10MPa. Above 1000°C, obvious crystallization begins, and as the treatment temperature increases, cracks gradually appear on the surface of the fiber, and above 1200°C, the fiber begins to pulverize; The interfacial bonding between the matrix is ​​enhanced, and the fracture mode of the composite material changes from fiber pullout to brittle fracture, resulting in a significant decrease in tensile strength

Method used

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  • High temperature-resistant quartz fiber reinforced silica-based composite material, and preparation method and application thereof
  • High temperature-resistant quartz fiber reinforced silica-based composite material, and preparation method and application thereof

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preparation example Construction

[0029] An embodiment of the present invention provides a method for preparing a high-temperature-resistant quartz fiber-reinforced silica-based composite material, comprising the following steps:

[0030] Step (1): Using quartz fiber with a coating on the surface of the monofilament to make a fabric preform, wherein the coating contains water and alumina and / or nano-alumina particles, and the fabricated fabric is prefabricated The body is heat-treated to obtain a fabric prefabricated body with a ceramic coating on the surface of the monofilament;

[0031] Specifically, in the embodiment of the present invention, the quartz fiber with a coating on the surface of the monofilament can be obtained by coating the surface of the quartz fiber monofilament with a coating containing water and alumina and / or nano-alumina particles, and the coating is preferably mainly Composition is Al 2 o 3 ·nH 2 O and epoxy resin; described quartz fiber monofilament is preferably the quartz fiber m...

Embodiment 1

[0047] see figure 1 , the present embodiment provides a quartz fiber reinforced silica composite material for a radome, comprising the following steps:

[0048] (1) Use quartz fibers with aluminum coating on the monofilament surface to weave a flat fabric preform with a size of 300×300×30mm, and then heat-treat the fabric preform at a temperature of 600°C and a holding time of 180min , to obtain a fabric prefabricated body with a ceramic coating on the surface of the monofilament, the appearance of which is as follows figure 2 As shown in a; subsequently, the whole fabric preform is immersed in the aluminum sol (diluted by commercially available aluminum sol) with a concentration of 10wt% in the dipping tank, and then the dipping tank is sealed and vacuumed to a vacuum of -0.06MPa , keep it for 120 minutes after reaching the target vacuum degree, return to normal pressure after holding the pressure, take out the fabric; control the drying of the taken out fabric, the drying ...

Embodiment 2

[0051] (1) Use quartz fibers with aluminum coating on the monofilament surface to weave a flat fabric preform with a size of 120×200×20mm, and then heat-treat the fabric preform at a temperature of 700°C and a holding time of 60 minutes ; Subsequently, the fabric prefabricated body is immersed in a concentration of 5wt% aluminum sol (diluted by commercially available aluminum sol) in the impregnation tank as a whole, then the impregnation tank is sealed and vacuumized to a vacuum degree of -0.08MPa to reach the target vacuum After holding the pressure for 100 minutes, return to normal pressure after holding the pressure, take out the fabric; control the drying of the taken out fabric, the drying temperature is 90 ° C, the humidity is controlled at 98% RH, and the drying time is 300 minutes; the dried fabric preform Carry out heat treatment, the heating temperature is 600 ° C, and the heating time is 180 min; through the observation of the scanning electron microscope, no obviou...

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Abstract

The invention relates to a high temperature-resistant quartz fiber reinforced silica-based composite material, and a preparation method and an application thereof. The method comprises the following steps: preparing a fabric preform from a quartz fiber having a coating layer on the surface of a monofilament, and carrying out heat treatment on the prepared fabric preform to obtain a fabric preformhaving a ceramized coating layer on the surface of the monofilament, wherein the coating layer contains water and alumina and / or nano-alumina particles; impregnating the fabric preform having the ceramized coating layer on the surface of the monofilament in an aluminum sol having a solid content of 5-10 wt%, and performing drying and heat treatment to obtain a fabric preform having the ceramized coating layer completely coating the monofilament fiber; and impregnating the obtained fabric perform in a silica sol, and then performing drying curing and heat treatment to obtain the high temperature-resistant quartz fiber reinforced silica-based composite material. The high temperature resistance of the quartz fiber reinforced silica composite material is greatly improved, the tensile strengthat 1200 DEG C is increased to 30 MPa or above from about 10 MPa, and the 1200 DEG C high temperature strength retention rate is increased to 80% or above from 50% or below.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature-resistant quartz fiber reinforced silica-based composite material, which belongs to the technical field of composite materials. Background technique [0002] Quartz fiber-reinforced silica-based radome composite material is a heat-transmitting material that integrates wave-transmitting, load-carrying, and heat-insulating functions. At present, the mature preparation process of this material is the cyclic impregnation process of high-purity silica sol. The high-purity quartz fiber fabric is impregnated with silica sol and dried, and this cycle is repeated several times. After heat treatment, quartz fiber reinforced silica is finally obtained. base composite material. [0003] At present, the maximum long-term service temperature of this material is only 1000-1100°C, and the tensile strength of the composite material is poor at 1200°C, generally around 10MPa. Above 1000°C, obvious crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/14C04B35/622H01Q1/42
CPCC04B35/803C04B35/14C04B35/622C04B2235/5228H01Q1/42
Inventor 张大海周军赖文恩张敬义
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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