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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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sic颗粒的高温氧化动力学
Keywords: 材料科学基础学科,sic颗粒,高温氧化动力学,氧化速率
Abstract:
？研究了sic颗粒在927oc、1027oc和1127oc空气中的高温氧化动力学.结果表明,温度越高sic颗粒的氧化速率常数越大,氧化反应越容易进行;sic颗粒的高温氧化分为氧化前期和氧化后期两个阶段.氧化前期的反应速率受界面化学反应的控制;氧化后期受扩散控制,其表观活化能远比氧化前期的大.sic颗粒的高温氧化过程符合两个阶段式模型:氧化前期的氧化速率常数kc=143.37exp(-70994}/(rt))(mgm-2min-1),氧化后期的氧化速率常数kd=3.61108exp((-192758)(rt))(mgm-2min-1).
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