Preparation method of high temperature-resisting mullite fiber porous heat insulation tile

Abstract

The invention relates to a preparation method of high temperature-resisting mullite fiber porous heat insulation tile. The preparation method comprises the following steps of shearing ceramic fiber by utilizing a fiber pulverizer, thus obtaining chopped fiber; mixing acrylamide, tert butyl alcohol and methylene bisacrylamide, thus obtaining a premixed solution; adding silicon powder, thus obtaining premixed slurry; putting the premixed slurry in a ball mill for carrying out ball milling, thus obtaining uniformly dispersed ceramic slurry; adding mullite fiber in the ceramic slurry, and stirring by using an electromagnetic stirrer, thus obtaining fiber slurry; adding a catalyst and an initiator in the fiber slurry, and pouring the fiber slurry in a mold for curing; drying the mold and a rough body, demolding, thus obtaining a dried rough body; putting the dried rough body in a high-temperature furnace for debonding and sintering, thus obtaining a ceramic fiber porous heat insulation tile. According to the preparation method of the high temperature-resisting mullite fiber porous heat insulation tile, disclosed by the invention, the technical problems that the temperature resistance of a binder of a mullite fiber heat insulation tile is not high enough, and fiber cannot be well coated are solved; the prepared mullite fiber heat insulation tile can bear 1500 DEG C of high temperature and can be used for hypersonic speed aerospace crafts.

Description

technical field [0001] The invention relates to a preparation method of a heat-resistant mullite fiber porous heat-insulating tile. Background technique [0002] In the field of aerospace, aerospace aircraft with high Mach number, long endurance, and the ability to repeatedly travel to and from the atmosphere have become the focus of military competition among various countries, and the resulting problem of high temperature and heat insulation of aircraft has become one of the main problems restricting its development . Mullite fiber rigid porous material has the advantages of light weight, heat insulation, high temperature resistance, oxidation resistance and corrosion resistance, and plays a vital role in the heat insulation layer of various aerospace vehicles. [0003] At present, traditional ablative thermal protection materials are difficult to meet the requirements of reusability, and the temperature resistance of oxidation-resistant silica fiber porous materials (up ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems that the existing mullite fiber thermal insulation tile binder has insufficient temperature resistance and cannot coat the fibers well, and provides a preparation of high temperature resistant mullite fiber porous thermal insulation tile Method, polycrystalline mullite fiber was selected as the matrix, silicon powder was used as the binder, and a three-dimensional homogeneous mullite fiber thermal insulation material with excellent spatial structure was prepared by using the gel injection molding process and in-situ solidification.

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