Oxidation Kinetics of N18 Zirconium Alloy at Temperatures of 600~1200℃ in Steam
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摘要: 研究了我国自主研发的N18锆合金在600~1200℃蒸汽中的氧化动力学曲线随温度及时间的变化规律。结果表明,温度低于700℃时,N18锆合金的氧化遵从抛物线规律;温度达到800℃时表现为抛物线-线性关系;950℃时由抛物线关系转变为立方指数关系;在1050℃时氧化速率指数快速下降至2.3,即为近似抛物线关系;高于1100℃后,氧化速率指数保持在2.1~2.2之间,即抛物线关系。分析认为N18锆合金比Zr-4合金耐氧化,且前者氧化速率的转折所需时间比后者更长。Abstract: The oxidation kinetics of N18 alloy at the temperatures of 600℃~1200℃ in steam were investigated.The results showed that the oxidation kinetics was changed by varying the oxidation temperatures due to the phase transformations of the base metal and its oxide;parabolic rate(600℃~700℃) → parabolic-linear rate(800℃) →cubic rate(950℃) →cubic(or parabolic) linear rate(1050℃) →parabolic rate(1100℃~-1200 ℃)parabolic rate(at 1100℃~1200℃).And the oxidation resistance of the N18 alloy at all the temperatures was superior to that of Zircaloy-4 from the higher rate exponent due to the Nb addition.
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Key words:
- N18 zirconium alloy /
- High-temperature oxidation /
- Oxidation kinetics
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