Properties of ceramics in the system ZrB_2–Ta_5Si_3
Properties of ceramics in the system ZrB_2–Ta_5Si_3
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DOI：
10.1557/jmr.2006.0321
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发表时间：
2006-10
影响因子：
2.7
通讯作者：
I. Talmy;J. Zaykoski;M. Opeka;A. Smith
中科院分区：
文献类型：
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作者：
I. Talmy;J. Zaykoski;M. Opeka;A. Smith
研究了ZrB_2-Ta_5Si_3体系陶瓷作为开发新型超高温陶瓷材料的候选材料。采用热压法制备陶瓷，温度为1900 ~ 2200℃。由于ZrB_2和Ta_5Si_3的化学相互作用和固溶性，即使少量的ZrB_2和Ta_5Si_3的相互加入也有显著的致密效应，这在文献中尚未报道。Ta_5Si_3含量在8 ~ 30 vol%之间的材料比纯ZrB_2的氧化率低，这是Ta_2O_5诱导硼硅酸盐玻璃表面相分离的结果。在较高浓度下，随着Ta_5Si_3含量的增加，抗氧化性显著降低。材料的氧化行为趋势与氧化产物的体积有很大的关系。Ta_5Si_3含量高达10 mol% （30 vol%）的陶瓷具有最高的抗氧化性，在体系中也具有最高的强度和硬度，是氧化环境下高温结构应用的兴趣。
Ceramics in the system ZrB_2–Ta_5Si_3 were studied as candidates for the development of new ultra high-temperature ceramic materials. The ceramics were prepared by hot pressing at 1900–2200 °C in He. Mutual additions of ZrB_2 and Ta_5Si_3 even in small amounts had significant densifying effects due to chemical interactions and solid solubility between the components, which have not been reported in the literature. Materials containing between 8 and 30 vol% Ta_5Si_3 exhibited less oxidation than pure ZrB_2, which is the result of phase separation in surface borosilicate glass induced by Ta_2O_5. For higher concentrations, oxidation resistance substantially decreased with increasing Ta_5Si_3 content. The trend in the oxidation behavior of the materials showed significant dependence on the volume of oxidation products. Ceramics containing up to 10 mol% (30 vol%) Ta_5Si_3, which showed the highest oxidation resistance, also had the highest strength and hardness in the system, and are of interest for high-temperature structural applications in oxidizing environments.