Microstructural Regulation, Oxidation Resistance and Mechanical Properties of Cf/SiC/SiHfBOC Composites Prepared By Chemical Vapor Infiltration With Precursor Infiltration Pyrolysis

doi:10.21203/rs.3.rs-416204/v1

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Research Article

Microstructural Regulation, Oxidation Resistance and Mechanical Properties of Cf/SiC/SiHfBOC Composites Prepared By Chemical Vapor Infiltration With Precursor Infiltration Pyrolysis

https://doi.org/10.21203/rs.3.rs-416204/v1

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Journal Publication

published 27 Oct, 2021

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To further improve the oxidation resistance of PDC (Polymer Derived Ceramic) composites in harsh environments, C_f/SiC/SiHfBOC composites were prepared by CVI (Chemical Vapor Infiltration) and PIP (Precursor Impregnation Pyrolysis) methods. The weight retention change, mechanical properties, and microstructure of C_f/SiC/SiHfBOC before and after oxidation in air were studied in detail. Microscopic analysis showed that only the interface between the ceramic and fibers were oxidized to some extent and hafnium had been enriched on the composite surface, after oxidation at different oxidation environments. After C_f/SiC/SiHfBOC composites oxidized at 1500 ℃ for 60 min, it was mainly determined by the HfO₂ and HfSiO₄ phase. Moreover, the weight retention ratio and compressive strength of the C_f/SiC/SiHfBOC composites are 83.97 % and 23.88 ± 3.11 MPa, respectively. It indicates that the C_f/SiC/SiHfBOC composites can be used for a long time in the oxidation environment at 1500 ℃.

Ceramics

Cf/SiC/SiHfBOC composites

Precursor infiltration pyrolysis method

Mechanical properties

High-temperature oxidation resistance