Kinetics and mechanism of the oxidation of ZrC
Kinetics and mechanism of the oxidation of ZrC
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DOI：
10.1016/0925-8388(94)90042-6
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发表时间：
1994-05
影响因子：
6.2
通讯作者：
G. A. R. Rao;V. Venugopal
中科院分区：
文献类型：
--
作者：
G. A. R. Rao;V. Venugopal
研究了烧结ZrC粉末在5 ~ 50 kPa不同氧压下等温和非等温加热条件下的氧化行为，并通过热重分析法跟踪了反应过程中的重量变化。当以5 K min-1非等温加热时，样品在101.3 kPa的氧气压力下点燃。最终产物经X射线衍射鉴定为立方ZrO 2在温度低于1073 K和单斜以上。发现反应速率受扩散控制。反应的机理进行了讨论，在氧气通过产品层的扩散。
The oxidation behaviour of sintered ZrC powder was studied under iso- and non-isothermal heating conditions under varied oxygen pressures from 5 to 50 kPa and the weight changes during the reaction were followed by thermogravimetry. The sample ignited under an oxygen pressure of 101.3 kPa when heated non-isothermally at 5 K min−1. The end product was identified by X-ray diffraction as cubic ZrO2at temperatures below 1073 K and monoclinic above that. The rate of the reaction was found to be diffusion controlled. The mechanism of the reaction was discussed in terms of the diffusion of oxygen through the product layer.