Abstract: Flexible fiber felt blankets were often used in the past as a reusable thermal insulation material for thermal protection on the leeward side of hypersonic vehicles. In addition, owing to its superior flexibility and elasticity, this material has promising applications in the field of thermal sealing. In this study, based on the potential demand for thermal sealing of flexible fiber blankets, we conducted research on the temperature resistance level, elastic properties, and thermal insulation performance of flexible fiber blankets and their cotton cores to reveal the heat transfer mode and deformation characteristics of this type of flexible fiber insulation material. In this study, we proposed the application environment range of this material to provide the research foundation for the design, research and development of this fiber insulation material in the field of thermal barried sealing. The results show that the resilience rate of flexible cotton cores was greater than 80% when compressed by 30%. Furthermore, the resilience attenuated as the number of compression cycles increased, and the deformation caused by compression increased the thermal conductivity of the cores. When the temperature reached above 1 100 ℃, the quartz cotton cores underwent significant volume contraction. The flexible thermal insulation felt has excellent thermal insulation ability and it can maintain the back side temperature below 200 ℃ when its front side temperature is maintained at 1 000 ℃ for 60 min.
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2023, Vol. 37 
