Abstract: In this paper, the properties of different low-density heat-resistant coating prescriptions were compared, and a heat-resistant coating with a density of 0.65 g/cm3, a tensile strength of 2.04 MPa, and a thermal conductivity of 0.126 W/(m·K) was obtained. The thermal performance of the coating was characterized by an oxygen-acetylene ablation test, a hot radiation test using a quartz lamp and in an arc-heated wind tunnel test. The results indicated that the low-density heat-resistant coating prescription has advantages of high temperature resistance, erosion resistance, ablative resistance and excellent heat resistance, which can satisfy the heat resistance requirements of new-generation launch vehicle fairings.
The successful application of this heat-resistant coating technology resolved the problems of low efficiency and poor adhesive performance of the traditional hand-pasted cork process, and realized the rapid spray application of the thermal protection layer, effectively improved the manufacturing efficiency and production quality of the heat-resistant layer of new-generation launch vehicle fairings.

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