Effect of Si and Zr additions on oxidation resistance of hot-pressed ZrB2–SiC composites with polycarbosilane as a precursor at 1500 °C
Effect of Si and Zr additions on oxidation resistance of hot-pressed ZrB2–SiC composites with polycarbosilane as a precursor at 1500 °C
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DOI：
10.1016/j.jallcom.2008.02.108
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发表时间：
2009-03
影响因子：
6.2
通讯作者：
Weiming Guo;Xiao-Jun Zhou;Guo‐Jun Zhang;Y. Kan;Yaogang Li;Pei-ling Wang
中科院分区：
文献类型：
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作者：
Weiming Guo;Xiao-Jun Zhou;Guo‐Jun Zhang;Y. Kan;Yaogang Li;Pei-ling Wang
由聚碳硅烷 (PCS) 涂覆的 ZrB2 粉末制备了三种 ZrB2-SiC 复合材料。添加或不添加 Si 或 Zr 的粉末通过 1800°C 热压进行致密化。最后，研究了复合材料在1500℃空气中的抗氧化性能。使用 X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 以及能量色散光谱 (EDS) 表征相组成和微观结构。结果表明，添加 Si（与热解 PCS 中的游离碳反应生成 SiC）提高了以 PCS 为前驱体的 ZrB2-SiC 复合材料的抗氧化性，而添加 Zr（与碳反应生成 ZrC）则降低了抗氧化性。
Three ZrB2–SiC composites were prepared from polycarbosilane (PCS)-coated ZrB2powders. Powders with or without additions of Si or Zr were densified by hot pressing at 1800°C. Finally, the oxidation resistance of the composites was studied at 1500°C in air. The phase composition and microstructure were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) along with energy-dispersive spectroscopy (EDS). Results showed that Si addition, which reacted with free carbon coming from the pyrolyzed PCS to produce the SiC, improved the oxidation resistance of ZrB2–SiC composites with PCS as a precursor, whereas Zr addition, which reacted with the carbon to produce the ZrC, decreased it.