Improved ablation resistance of C/SiC-ZrB2 composites via polymer precursor impregnation and pyrolysis
Source abstract
Abstract
Abstract Carbon fiber-reinforced silicon carbide (C/SiC) composites modified with ZrB2-SiC ceramics of different compositions were prepared via polymer impregnation and pyrolysis. The ablation behaviors of the composites were systematically studied using an oxy-acetylene torch. The oxidation/ablation mechanisms related to the evolution of the surface morphologies are also discussed on the basis of thermodynamics. The results indicate that the decomposition of the SiC matrix was mainly responsible for the failure of the C/SiC materials. For C/SiC-ZrB2, the gaseous reactants and products flowed through the micropores of the ZrO2 skeleton obeying the Knudsen diffusion law. This retarded the elimination process of SiC, resulting in the formation of a ZrO2-SiO2 protective layer, and finally the C/SiC-ZrB2 materials showed good ablation resistance.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Diamond and Carbon-based Materials Research
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