Wave-transmission and thermal-insulation material with high-temperature radiation resistance and preparation method of material

Abstract

The invention provides a wave-transmission and thermal-insulation material with high-temperature radiation resistance and a preparation method of the material. Specifically, the method comprises steps as follows: chromic salt is diluted and dissolved, an alkaline reagent is added, and a chromium salt complex solution is obtained; wave-transmission fiber reinforcement is soaked with the chromium salt complex solution, treated with sol-gel and dried, and a fiber preform is obtained; the fiber preform is sintered, and a chromium (III) oxide composited fiber reinforcement matrix is obtained; the fiber reinforcement matrix is soaked with silicon dioxide sol, treated with sol-gel, subjected to aging and solvent replacement and dried, and a fiber reinforced aerogel composite material is obtained; the fiber reinforced aerogel composite material is subjected to dampproof treatment, and the wave-transmission and thermal-insulation material with high-temperature radiation resistance is obtained. The invention further provides the wave-transmission and thermal-insulation material with high-temperature radiation resistance and an application of the material. According to the method, grain size and crystal form of chromium (III) oxide can be controlled, and excellent high-temperature radiation resistance and dielectric property of the material are guaranteed.

Description

technical field [0001] The invention relates to a high-temperature radiation-resistant wave-transparent heat insulation material and a preparation method thereof, belonging to the technical field of heat protection. Background technique [0002] Airgel material is a new type of low-density nanoporous material. It is the solid material with the best thermal insulation performance. Airgel is formed by the accumulation of nanoparticles and has a three-dimensional network nanoporous structure, which can significantly reduce the solid thermal conductivity of the material. , convective heat transfer and radiation heat transfer, while airgel is almost transparent to the near-infrared wavelength of 2-10 μm, and at high temperature, the effect of radiation heat transfer is very obvious. If no anti-infrared opacifying agent is added, the high temperature of airgel The heat insulation effect is reduced, and the ratio of each heat transfer path in the airgel can be changed after adding ...

AI Technical Summary

Problems solved by technology

However, these patents did not use high-purity chromium salt complexes, and did not go through high-temperature sintering steps, which could not remove small organic molecules and metal impurities in the raw materials; It is expected to form chromium trioxide grains in the appropriate particle size range, so the expected room temperature thermal conductivity, dielectric constant and loss tangent cannot be obtained, which makes the high temperature resistance, radiation wave penetration and heat insulation performance insufficient

Images