Influence of processing route and yttria additions on the oxidation behavior of tungsten
Influence of processing route and yttria additions on the oxidation behavior of tungsten
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DOI：
10.1016/j.jnucmat.2012.10.033
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发表时间：
2013-11
影响因子：
3.1
通讯作者：
S. C. Cifuentes;A. Muñoz;M. Monge;P. Pérez
中科院分区：
文献类型：
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作者：
S. C. Cifuentes;A. Muñoz;M. Monge;P. Pérez
在873 ~ 1073 K的干燥空气中，对纯钨和分散度为0.6 wt.%的y2o3纳米颗粒增强钨的抗氧化性能进行了评估，该温度范围是核聚变发电厂的导流器在发生冷却剂损失事故和/或容器进入空气的情况下应长期承受的温度范围。这两种材料都是通过热等静压法制备的，包括球磨钨粉和分散的y2o3纳米颗粒。并与传统工艺处理纯钨的结果进行了比较。在873 K下进行的热重测试表明，加工路线和添加钇对纯钨的抗氧化性有很大影响。在873 K下，w - 0.6 y2o3的质量增益分别比常规工艺和粉末冶金法制备的纯钨低5倍和2倍。这种不同的行为与氧化垢的结构和组成的变化有关。在873 K以上，所有材料的动力学都明显加快，因为从最早的氧化阶段开始就形成了非保护性氧化层，尽管含y2o3材料的动力学仍然是最慢的，特别是在973 K时。分析了钇的加入对钨氧化机理的影响。
The oxidation resistance in dry air of pure tungsten and tungsten reinforced with a dispersion of 0.6 wt.% Y2O3nanoparticles has been evaluated between 873 and 1073 K, temperature range that divertor in fusion power plants should endure during long-term times in the case of loss of coolant accident and/or air ingress in the vessel. Both materials were prepared by a powder metallurgy route involving hot isostatic pressing of ball milled tungsten powders and tungsten with dispersed Y2O3nanoparticles. The results have been compared with those of pure tungsten processed by conventional techniques. Thermogravimetric tests at 873 K revealed that the processing route as well as yttria addition considerably affected the oxidation resistance of pure tungsten. Mass gain of W–0.6Y2O3at 873 K was five and two times lower than that of pure tungsten prepared by conventional processing techniques and by powder metallurgy, respectively. This different behavior was related to changes in the structure and composition of the oxide scale. Above 873 K, the kinetics were significantly accelerated for all materials due to the development of a non-protective oxide scale from the earliest oxidation stages, although the kinetics of Y2O3-containing material were still the slowest, specially at 973 K. It was analyzed how yttria additions modify the oxidation mechanism of tungsten.