A method for preparing quartz composite materials by electrophoretic deposition of silica sol

Abstract

The invention discloses a method for preparing a quartz composite material by the electrophoretic deposition of silica sol. The method comprises the following steps: (1) weaving quartz fibers to form an integral fabric of an appointed shape, and removing and drying impregnating compound on the surface of fabric fibers; (2) in an insulated container, putting quartz fiber fabrics between an anode and a cathode, and connecting with a direct-current power supply; (3) injecting the silica sol into the insulated container to enable the sol to completely submerge electrodes and fabrics; (4) turning on the direct-current power supply, regulating voltage, carrying out the deposition of silica sol on the fabrics, extracting clear liquid according to the size of a construction member, and filling the sol; (5) taking out the fabrics subjected to electrophoretic deposition, drying, sintering, and forming a quartz fiber enhanced quartz ceramic composite material. The method has the advantages of simple and reliable operation, short period and low cost, and the compactness and the evenness of the material can be improved.

Description

technical field [0001] The invention relates to a method for preparing a quartz composite material, in particular to a method for preparing a quartz composite material by electrophoretic deposition of silica sol. Background technique [0002] Quartz fiber-reinforced quartz composite materials have the characteristics of high temperature resistance, high strength, high toughness, low dielectric, low loss, and low thermal conductivity. They can be used for wave-transparent window materials such as spacecraft, or high-temperature wave-transparent window materials for industrial equipment. It can withstand high temperatures above 1000°C and has the characteristics of transmitting electromagnetic waves. [0003] The preparation method of this material is generally the impregnation sol-gelation-sintering method, that is, the silica sol is vacuum-impregnated into the quartz fiber fabric, and after the gel is dried, the impregnation gelation and sintering are repeated, and finally a...

AI Technical Summary

Problems solved by technology

[0004] Since the solid content of silica sol is generally about 25%, and the impregnation efficiency is relatively low, the traditional method of repeated impregnation and gel sintering often requires dozens or even dozens of impregnations. The number of times of drying and sintering makes the preparation cycle of the material long and the cost is high, which greatly limits its wide application

[0005] Electrophoretic deposition methods, such as Huang Jianfeng's "Method for preparing mullite outer coating of carbon / carbon composite materials by pulse hydrothermal electrophoretic deposition method" (CN101885623A), Wang Hong's "Preparation method of nano-polymer composite materials based on electrophoretic deposition" (CN102181912A) , Gao Junguo "A method for preparing ceramic composite coatings by electrophoresis-electrolysis composite electrodeposition" (CN102776549A), Huang Jianfeng "A method for preparing yttrium silicate coatings by cathode rotating hydrothermoelectrophoretic deposition" (CN101514473), Mei Hui " A preparation method of electrophoretic deposition of CNTs reinforced ceramic matrix composites" (CN104150939A), Guo Lingjun "Preparation method of electrophoretic deposition of nanowire toughened SiC anti-oxidation coating" (CN104591798A), Li Hejun "Preparation of a dielectrophoresis technology Method for carbon nanotube / carbon / carbon composite material" (CN103451708A), Cao Liyun "Method for preparing carbon / carbon composite material C-AlPO4 outer coating by microwave hydrothermoelectrophoresis arc discharge deposition" (CN102674885A), Dai Changsong "A method for improving calcium Phosphorus-Chitosan Electrophoretic Deposition Uniformity in Metal Foam" (CN102560604A), Yao Xuming "Acidification-Assisted Electrophoretic Deposition Initiated Graphene Oxide Deposition Modified Carbon Fiber Method" (CN105696312A), etc., but there is no relevant electrophoresis Preparation of Quartz Fiber Reinforced Quartz Ceramic Composites by Deposition Method