对Zr-A和Zr-B锫合金在700-1200℃的O2中进行了等温氧化实验,观察了合金的氧化动力学行为和基体微观结构演变,并与低Sn的Zr-4合金作了对比.结果表明,700-1200℃氧化时,3种锆合金的动力学曲线基本服从抛物线规律,Zr-B合金在700℃氧化1200 s后速率出现转折；800℃时Zr-A和Zr-B合金的氧化速率出现转折；1000℃时3种合金动力学曲线由抛物线变为近似直线；1100℃以上氧化时,动力学曲线呈抛物线规律,未出现转折.在1100℃以上氧化时,合金成分对3种合金的高温氧化性能影响甚微.依据氧化增重数据得到了3种合金在700-1200℃氧化反应的抛物线速率常数Kp的表达式.
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