Silicon-aluminium aerogel composite material and manufacturing method thereof

Abstract

The invention provides a silicon-aluminium aerogel composite material, comprising (1) silicon-aluminium compound aerogel and (2) inorganic fiber material. The invention further provides a method for manufacturing silicon-aluminium aerogel composite material with simple technology, comprising the steps of preparing silica sol, preparing aluminium sol, preparing silicon-aluminium compound sol, dipping sol, gelatinizing, ageing, overcritical drying, etc. With excellent high-temperature resistant performance, nice mechanical property and lower thermal conductivity at high temperature, the silicon-aluminium aerogel composite material can meet the high demand of thermal protection in respect of aviation, space flight and military affairs and can be applied to the civil heat insulation field.

Description

technical field

[0001] The invention belongs to the technical field of materials, and relates to an airgel composite material and a preparation method thereof. Background technique

[0002] As the flight speed of the aircraft is getting faster and the surface temperature is getting higher and higher, the thermal insulation effect and mechanical properties of conventional aluminum silicate or mullite fibers can no longer meet the thermal protection requirements of aerospace vehicles in the high temperature section. The use of nano-airgel thermal insulation composites has become the leading direction for efficient thermal insulation.

[0003] Airgel is currently the most ideal lightweight thermal insulation material. It is a lightweight, amorphous and porous solid material composed of nano colloidal particles or polymer molecules. It has extremely low density, high specific surface area and high porosity. . The pore size of airgel (<50nm) is smaller than the mean free pat...

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