Abstract
Abstract By introducing functional fillers into the ethylene propylene diene monomer matrix, the anti-ablation, thermal insulation, and adhesive layer were prepared, respectively. We have studied the mechanical properties, ablation properties, thermal insulation properties, and bonding properties of different composite structures after design and analyzed the ceramic mechanism. The results showed that the content of ceramic fillers improved the thermal stability and ablation properties of anti-ablation layer composites. The formation of liquid structure can fill the hole defects and ablation pit. The foaming agent improved thermal insulation properties of the thermal insulation layer, and the strength of the bonding layer has been greatly improved. The design of the composite structure can not only reduce the density but also have an excellent thermal insulation effect. And as the thickness of the heat insulation layer increases, the heat blocking effect becomes more excellent.
Highlights
As a key part of the thermal protection system, thermal protection materials protect the internal structure from damage in extreme environments [1,2]
The results show that the increase in temperature enables the pyrolysis products to be effectively bonded to form a continuous dense ceramic structure, and the formation of the barrier layer significantly improves the fire resistance
Fumed silica with a Brunauer–Emmett–Teller surface area of 200 m2/g, zirconium dioxide (ZrO2), silicon carbide (SiC) with a particle size of 1–5 μm, kaolin with a particle size of 11 μm, zinc borate (ZB) with a particle size of 2–5 μm, and aluminum hydroxide were supplied by Shanghai Aladdin Reagent Co., Ltd. (Shanghai, China)
Summary
As a key part of the thermal protection system, thermal protection materials protect the internal structure from damage in extreme environments [1,2]. The results show that the increase in temperature enables the pyrolysis products to be effectively bonded to form a continuous dense ceramic structure, and the formation of the barrier layer significantly improves the fire resistance. Yang et al [16] prepared silicone rubber composites with different ZrC and ZrO2 contents, in which ZrO2 or ZrC forms a ceramic layer structure containing ZrO2, SiO2, and SiC on the ablated surface of the composite material, which can act as an effective oxygen and thermal barrier, while reducing internal corrosion. The density of composites with ceramic fillers will increase significantly, which will increase the overall weight and limit the application of composite materials in thermal protection systems [18,19]. The ablation material of the composite structure was prepared by the method of integrated solidification and molding, and the relevant performance test of each functional layer was carried out
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