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<p>In this study, ZrB<sub>2</sub>-ZrC ceramics were successfully fabricated with Zr and B<sub>4</sub>C powders as raw materials through in-situ reactive Spark Plasma Sintering (SPS). The effect of sintering temperature on the properties of the ZrB<sub>2</sub>-ZrC ceramics was investigated. The results showed that the borothermic reaction released a significant amount of heat during the sintering process, effectively lowering the sintering temperature and promoting densification. At 1600&#xa0;°C, nearly full-density ZrB<sub>2</sub>-ZrC ceramics with an average grain size of less than 4&#xa0;μm were achieved. The hardness and flexural strength of the samples sintered at 1600&#xa0;°C reached 18.48 GPa and 417.46&#xa0;MPa, respectively, exhibiting optimal mechanical properties. Further increasing the sintering temperature led to grain coarsening, resulting in a decrease in hardness and flexural strength. The sample sintered at 1800&#xa0;°C exhibited the best oxidation resistance, with a dense oxidation layer on the surface and no visible pores or cracks. Increasing the sintering temperature further led to grain growth and a reduction in the number of grain boundaries, which lowered the oxygen diffusion rate and enhanced oxidation resistance. Overall, sintering temperature had a significant impact on the properties of ZrB<sub>2</sub>-ZrC ceramics. Sintering at 1600&#xa0;°C yielded the best combination of mechanical properties and oxidation resistance. This study provides valuable insights into the preparation and performance optimization of ZrB<sub>2</sub>-ZrC ceramics.</p>

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Effects of Sintering Temperature on the Performance of ZrB2-ZrC Ceramics Prepared by In-Situ Reactive Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Rong Yan,
  • Longfei Li,
  • Huiping He

摘要

In this study, ZrB2-ZrC ceramics were successfully fabricated with Zr and B4C powders as raw materials through in-situ reactive Spark Plasma Sintering (SPS). The effect of sintering temperature on the properties of the ZrB2-ZrC ceramics was investigated. The results showed that the borothermic reaction released a significant amount of heat during the sintering process, effectively lowering the sintering temperature and promoting densification. At 1600 °C, nearly full-density ZrB2-ZrC ceramics with an average grain size of less than 4 μm were achieved. The hardness and flexural strength of the samples sintered at 1600 °C reached 18.48 GPa and 417.46 MPa, respectively, exhibiting optimal mechanical properties. Further increasing the sintering temperature led to grain coarsening, resulting in a decrease in hardness and flexural strength. The sample sintered at 1800 °C exhibited the best oxidation resistance, with a dense oxidation layer on the surface and no visible pores or cracks. Increasing the sintering temperature further led to grain growth and a reduction in the number of grain boundaries, which lowered the oxygen diffusion rate and enhanced oxidation resistance. Overall, sintering temperature had a significant impact on the properties of ZrB2-ZrC ceramics. Sintering at 1600 °C yielded the best combination of mechanical properties and oxidation resistance. This study provides valuable insights into the preparation and performance optimization of ZrB2-ZrC ceramics.