Microstructural characterization of ZrO2 layers formed during the transition to breakaway oxidation
Microstructural characterization of ZrO2 layers formed during the transition to breakaway oxidation
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DOI：
10.1016/j.jnucmat.2010.01.021
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发表时间：
2010-04
影响因子：
3.1
通讯作者：
D. Park;J. Park;Y. Jeong;J. Y. Lee
中科院分区：
文献类型：
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作者：
D. Park;J. Park;Y. Jeong;J. Y. Lee
为了表征Zircaloy-4管在脱离转变过程中形成的氧化层的微观结构，在1000°C和不同氧化时间下进行了流动蒸汽环境中的氧化测试。结果发现，氧化时间为3000s后发生了脱离氧化，所有样品中二氧化锆层均以四方相和单斜相两种混合晶型存在。断裂氧化后，氧化锆层结晶度增强，晶粒尺寸增大，晶界处出现细孔。我们发现，脱离氧化不稳定性的引发源于这些微观结构的变化。
In order to characterize the microstructure of oxide layers formed on Zircaloy-4 tubes during the breakaway transition, oxidation tests in a flowing steam environment were performed at 1000°C with a different oxidation time. It was found that breakaway oxidation occurred after the oxidation time of 3000s, and zirconium dioxide layers existed in two mixed crystallographic forms of the tetragonal and monoclinic phase in all samples. The zirconium oxide layers showed enhanced crystallinity, increase in grain size, and fine pores at the grain boundary after breakaway oxidation. We found that the initiation of breakaway oxidation instability originated from these microstructural changes.