High temperature oxidation resistance of hot-pressed h-BN/ZrO2 composites
High temperature oxidation resistance of hot-pressed h-BN/ZrO2 composites
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DOI：
10.1016/j.ceramint.2014.03.146
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发表时间：
2014-08
影响因子：
5.2
通讯作者：
Xu Yin;T. Ma;W. Xinhua;Yinzhu Jiang;M. Yan
中科院分区：
文献类型：
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作者：
Xu Yin;T. Ma;W. Xinhua;Yinzhu Jiang;M. Yan
研究了添加ZrO2对h-BN/ZrO2复合材料组织和高温氧化行为的影响。在h-BN中加入20wt%的ZrO2，在1200℃时，除了增强强度外，还能有效地阻止氧与硼之间的氧化反应。烧结后的复合材料中除了掺杂的ZrO2颗粒外，还通过与h-BN的反应生成了ZrB2和ZrB。这些Zr-B化合物的氧化产物ZrO2在氧化过程中起到保护层的作用，覆盖了样品表面，阻止了氧的进一步渗透。1200℃下良好的抗氧化性和高强度使h-BN/ZrO2复合材料在高温应用中具有广阔的应用前景。
Influences of ZrO2additive on the microstructure and high temperature oxidation behavior of h-BN/ZrO2composites have been investigated. In addition to the enhanced strength, the oxidation reaction between boron and oxygen can be effectively hindered even at 1200 °C when adding 20 wt% ZrO2into the h-BN matrix. Besides the doped ZrO2particles, ZrB2and ZrB were also formed in the composites after sintering via the reaction between ZrO2and h-BN. The oxidation product ZrO2of these Zr–B compounds can act as protective layer during oxidation, which covers the sample surface and prevents further penetration of oxygen. Good oxidation resistance at 1200 °C and high strength make h-BN/ZrO2composites promising materials for high temperature applications.