Oxidation Behavior of Tantalum Boride Ceramics
Oxidation Behavior of Tantalum Boride Ceramics
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DOI：
10.4028/www.scientific.net/ssp.124-126.819
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发表时间：
2007-06
期刊：
影响因子：
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通讯作者：
J. Matsushita;G. Hwang;K. Shim
中科院分区：
文献类型：
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作者：
J. Matsushita;G. Hwang;K. Shim
研究了二硼化钽（TaB2）粉末在高温下的氧化行为，以确定采用先进高温结构材料的可能性。不幸的是，已知单片TaB2在高温下具有化学稳定性。迄今为止，关于TaB2陶瓷性能的报道很少。样品在室温下氧化至1273 K，在空气中氧化5分钟至25小时。通过测量重量变化来估计其抗氧化性。样品在873 K时开始氧化，氧化时间较短，为5分钟，随着氧化温度的升高，重量增加。另一方面，在氧化时间超过1小时时，在973 ~ 1073 K处观察到最大增重值。然而，即使提高氧化温度，也会发生轻微的额外重量变化。样品在1273 K下氧化5分钟至25小时，重量增加约为理论氧化质量变化的40 ~ 20%。根据粉末x射线衍射数据，在873 K时，氧化后的TaB2样品转变为Ta2O5。最后，TaB2在高温下表现出良好的抗氧化性，这是因为氧化形成的氧化钽（Ta2O5）表面膜起到了抗氧化层的作用。
The oxidation behavior of tantalum diboride (TaB2) powder at high temperature was investigated in order to determine the possibility of the use of advanced high temperature structural materials. Unfortunately, monolithic TaB2 were known to be chemical stability up to high temperatures. To date, there have been few reports regarding the properties of TaB2 ceramics. The samples were oxidized at room temperature to 1273 K for 5 minutes to 25 hours in air. The weight changes were measured to estimate the oxidation resistance. The oxidation of samples oxidized for short oxidation time of 5 minutes started at 873 K, and the weight gain increased with increasing oxidation temperature. On the other hand, at the oxidation time of above 1 hour, a maximum weight gain value at 973 to 1073 K was observed. However, even if the oxidation temperature was increased an additional weight change slightly occurred. The weight gain of the sample oxidized at 1273 K for 5 minutes to 25 hours was about 40 to 20 % of the theoretical oxidation mass change. According to the powder X-ray diffraction date, the oxidized TaB2 sample was changed to Ta2O5 at 873 K. Finally, the TaB2 showed a good oxidation resistance at high temperature, because the surface film of tantalum oxide (Ta2O5) formed by oxidation acted as an oxidation resistant layer.