Ceramic composite material of high temperature insulation sandwich structure and method for preparing ceramic composite material

Abstract

Disclosed are a ceramic composite material of a high temperature insulation sandwich structure and a method for preparing the ceramic composite material. A core layer of the composite material is an aerogel composite material layer reinforced by high temperature resistant inorganic fibers, oxide ceramic composite material surface plates reinforced by high temperature resistant inorganic fibers are compounded on the upper surface and the lower surface of the core layer, the thickness of the core layer is larger than or equal to 2mm, and the thicknesses of the upper surface plate and the lower surface plate respectively range from 0.1mm to 3.0mm. The method for preparing the ceramic composite material of the high temperature insulation sandwich structure includes the steps: (1) selecting aerogel composite materials reinforced by the high temperature resistant inorganic fibers as materials of the core layer with the thickness larger than or equal to 2mm; (2) tiling high temperature resistant inorganic fiber cloth or thin-layer fabrics on the upper surface and the lower surface of the core layer to perform needling, puncture or sewing; (3) sucking sol in a vacuum manner and gelating the sol at the temperature of 30-200 DEG C; and (4) performing heat treatment. The ceramic composite material of the high temperature insulation sandwich structure integrates the functions of heat insulation, bearing, wave penetration and the like.

Description

technical field [0001] The invention relates to a high-temperature-resistant and heat-insulating ceramic composite material and a preparation method thereof, in particular to a high-temperature-resistant and heat-insulating sandwich-structure ceramic composite material and a preparation method thereof. Background technique [0002] High-speed aircraft such as spaceships or returnable satellites fly in the atmosphere at high speed for a long time, and the temperature of a large area exceeds 600°C, and some parts reach 1400°C. The "large area" referred to here generally accounts for more than 80% of the outer layer area of ​​the aircraft. Ceramic insulation tiles have played an important role in the US space shuttle and seem to be mature, but they are inherently brittle (the toughness is generally 1-5MPa×m 1 / 2 ), low strength (bending strength is generally less than 5MPa), high thermal conductivity (generally greater than 0.06W / m×k), and small single-piece area (generally 200...

AI Technical Summary

Problems solved by technology

There are many unresolved problems in this structure in China. First, the high temperature resistant thermal bridge blocking connection structure has not been solved. Second, the thermal expansion of the panel will cause serious thermal stress and many problems arising therefrom are difficult to solve. Third, the ultra-thin It is difficult to accurately control the surface accuracy of the panel

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