A Lightweight Pyrolytic Adaptive Dimensional Efficient Heat-Resistant Material

Abstract

The invention belongs to the field of aerospace thermal protection. Based on a light PICA heatproof composite material (a phenolic aldehyde impregnated carbon ablative material), the invention overcomes the contradiction of light weight and dimension of an existing heat protection material and discloses a light weight pyrolytic self-adaptive dimensional efficient heatproof material. Carbon fibersare coated with a ceramic, so that the carbon fibers are prevented from being in contact with oxygen. Residual carbon and ceramic filler are sintered to an antioxidant ceramic surface layer under theaction of aerodynamic heat, and the surface heat radiation rate is improved. The longer the aerodynamic heat action time is, the thicker the ceramic surface layer is and the higher the surface heat radiation rate is. The purpose of being self-adaptive to the environment is achieved. Based on pyrolytic heat absorption and a heat blocking effect of pyrolyzed gas, a heat leading heat-dissipating technique and a high radiation heat-dissipating technique of the ceramic surface layer of residual carbon, a synergistic effect of various heatproof mechanisms is achieved and the heatproof efficiency isimproved. The light weight pyrolytic self-adaptive dimensional efficient heatproof material can be applied to a heat protection system in medium and low heat flow heat environments of a hypersonic velocity near space aerocraft.

Description

technical field [0001] The invention discloses a light-weight pyrolysis self-adaptive shape-dimension high-efficiency heat-resistant material, which can be applied to a thermal protection system of a hypersonic approaching space vehicle in a medium-low heat flow heat environment, and belongs to the field of aerospace thermal protection. Background technique [0002] The thermal environment of a hypersonic approaching space vehicle is characterized by medium and low heat flow, long-duration aerobic, and kilosecond level. Lightweight PICA heat-resistant composite material (phenolic impregnated carbon ablative material) is one of the decisive factors for the advancement and reliability of aircraft. It has irreplaceable advantages on hypersonic near-space vehicles. Its heat-resistant mechanism involves a series of complicated physicochemical reaction process. As hypersonic speeds approach the heating of the surface of the spacecraft, the lightweight PICA heat-resistant composit...

AI Technical Summary

Problems solved by technology

On the surface of the carbonization layer, the residual carbon and carbon fiber undergo oxidation reaction with the oxygen in the air, causing the surface of the material to recede, changing the aerodynamic shape of the aircraft, and affecting the target accuracy; at the same time, the oxidation reaction increases the surface heat flow and increases the line ablation rate

At present, among the aircraft heat-resistant materials in service, it is impossible to meet the requirements of light weight and dimensionality at the same time

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