Abstract
A novel type of silicon rubber composite with benzoxazine resins (BZs) and ZrO2 was prepared. The ablative response of the composites was investigated. The results showed that the composites with BZs had superior thermal stability and higher resides compared to the pristine composites. The linear ablation rate of the composites decreased significantly with the increase in ZrO2 content. The maximum back-face temperature of the burnt samples was no more than 100 °C for the obtained composites. Three major ablation processes were carried out simultaneously during the ablation processing. These mainly involved the carbonization of the composite, and the formation of ceramic compounds such as SiC and ZrC, as well as the shielding effect of the ablated layer, which subsequently enhanced the ablation resistance of the composites.
Highlights
With the development of hypersonic aerospace vehicles, high-energy propellants have found widespread applications
Samples benzoxazine resins (BZs)-0 and BZ-1 exhibit a total weight loss of 84.21 and 79.36%, respectively. This suggests that benzoxazine with high carbon content was likely to increase carbon residue and form an ablation layer at high temperature, which subsequently leads to the excellent thermal resistance of sample BZ-1
The obtained thermogravimetric analysis (TGA) results showed that the composite with BZs had superior thermal stability and higher resides than the pristine composite
Summary
With the development of hypersonic aerospace vehicles, high-energy propellants have found widespread applications. They concluded that with the increase in ZrO2 or ZrC content, the linear and mass ablation rates of the composites gradually decreased [6] This established that adding high-melting inorganic fillers makes the surface layer brittle, with a low carbon content and high density. Benzoxazine resins (BZs) are a type of highly cross-linked aromatic polymer with outstanding advantages, including excellent thermal resistance, good flame retardancy, and near-zero volumetric shrinkage upon curing and high carbon residue [13,14,15,16]. These extraordinary properties make BZs the ideal resin to be used in SR composites for ultra-high temperature applications.
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