Rock wool fiber-reinforced silicon oxide-based high-strength thermal-insulation composite material and preparation method thereof

Abstract

The invention discloses a rock wool fiber-reinforced silicon oxide-based high-strength thermal-insulation composite material and a preparation method thereof. The objective of the invention is to enable the composite material to be high in strength and low in thermal conductivity. The material is composed of a silicon oxide matrix and a rock wool fiber prefabricated part, wherein pores of rock wool fibers are filled with the silicon oxide matrix, and the rock wool fibers are bonded into a whole; the rock wool fiber prefabricated part is formed by laying the rock wool fibers; and the silicon oxide matrix is formed by stacking small silicon oxide particles, and the small silicon oxide particles are obtained by carrying out gel aging, normal-pressure drying, repeated dipping and high-temperature sintering on water-based silica sol. The preparation method comprises the following steps: impregnating water-based silica sol with the rock wool fiber prefabricated part under vacuum to form a fiber prefabricated part/sol mixture, carrying out heating for a period of time to obtain a wet gel composite material, drying the wet gel composite material at normal pressure, carrying out repeated impregnation 2-6 times, and finally conducting sintering at high temperature to obtain the composite material. The material is high in mechanical property, low in heat conductivity and low in density; and the preparation method is low in cost, high in safety and simple and flexible in preparation process.

Description

technical field [0001] The invention relates to a high-strength heat-insulating composite material and a preparation method thereof, in particular to a silicon oxide (SiO 2 ) as a matrix and rock wool fiber as a reinforcement, and a rock wool fiber reinforced silica ceramic matrix high-strength thermal insulation composite material and a preparation method thereof. Background technique [0002] When a new type of high-speed aircraft flies in the atmosphere for a long time, it has the characteristics of high flight Mach number, high maneuverability and long flight time. The surface of the aircraft is subjected to severe aerodynamic heating, and the surface temperature of the body is very high. In order to ensure the normal operation of electronic and electrical equipment and prevent heat from entering the airframe, a large-area thermal protection system (Thermal Protection System, TPS) must be installed on the aircraft. TPS plays a pivotal role in the development and applicat...

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Problems solved by technology

[0009] In order to overcome the above-mentioned problems existing in the prior art, especially the problems of low strength and complex preparation process of heat insulation materials with low thermal conductivity, the present invention vacuum-impregnates rock wool fiber and silica sol, and after gel aging, normal A series of simple processes such as pressure drying, repeated impregnation, and high-temperature sintering obtain rock wool fiber-reinforced silica-based high-strength thermal insulation composite materials

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