Mechanical properties and oxidation resistance of ZrB2-SiC composites prepared with nano-sized particles by spark plasma sintering

Reference Presenter Authors
14-075 Xiaochao Jin Jin, X.(Xi'an Jiaotong University); Li, P.(North University of China); Wang, X.(Xi'an Jiaotong University); Fan, X.(Xi'an Jiaotong University); Wang, T.(Xi'an Jiaotong University); Ultra-high temperature ceramic (UHTC) is one of the most promising materials used in thermal protection system for hypersonic flight vehicle, due to their high melting points, high thermal conductivity, good oxidation and ablation resistance, and retained strength at high temperature. In this work, ZrB2-vol. 20% SiC composites were prepared with nano-sized ZrB2 (500 nm) and SiC (40 nm) particles by spark plasma sintering at 1400 °C. The relative density of the ZrB2-SiC composites reached 99.5%. The average grain size is less than 5 µm. The mechanical properties were tested from room to 1600 °C. Results showed that the ZrB2-SiC composites prepared in this work has excellent mechanical strengths at different temperatures. In addition, the oxidation behavior of ZrB2-SiC were investigated from 1000 to 1600 °C. Based on the microstructures of the ZrB2-SiC composites, an oxidation kinetics model was built. Comparison results show that the model can relatively accurately predict the oxidation behavior of ZrB2-SiC composites at different temperatures.
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