Microstructural regulation, oxidation resistance, and mechanical properties of Cf/SiC/SiHfBOC composites prepared by chemical vapor infiltration with precursor infiltration pyrolysis

Abstract To further improve the oxidation resistance of polymer derived ceramic (PDC) composites in harsh environments, C f /SiC/SiHfBOC were prepared by chemical vapor infiltration (CVI) and precursor impregnation pyrolysis (PIP) methods. The weight retention change, mechanical properties, microstructure before after air studied details. Microscopic analyses showed that only interface between ceramics fibers was oxidized to some extent, hafnium had been enriched on composite surface oxidizing at different temperature. main products HfO 2 HfSiO 4 1500 °C for 60 min. Moreover, ratio compressive strength are 83.97% 23.88±3.11 MPa, respectively. It indicates should be promising used a short time environment °C.