| 摘要: |
| 磨损是核电厂燃料元件失效的主要形式之一。燃料棒与定位格架磨损可能导致包壳破损和裂变产物泄露，引起一回路剂量超标，影响核电厂安全运行。在实际工况中，流体湍流引起格架和燃料棒之间的相对运动，其界面发生的位移可能是往复滑动，间歇冲击或数个运动的组合，即冲击-滑动摩擦磨损。涂层锆合金是事故容错燃料最有应用潜质的候选包壳，其磨损研究尚不够系统和全面。采用新型可控能量冲击-滑动磨损试验机，研究冲击能量和循环次数对锆合金 Cr 涂层磨蚀损伤行为的影响，并且对试验后试样进行白光干涉仪、扫描电镜(SEM)及电子探针(EPMA)等的表征，阐述锆合金 Cr 涂层磨蚀损伤的行为规律。结果表明：试样磨损随着循环次数的增加而增大，但随着冲击能量的增大而减小；Cr 涂层提高了界面的接触刚度和接触正压力值，并且减少了冲击过程中的接触时间，从而减小了包壳管材料的磨损。关注锆合金 Cr 涂层在低速高频模式下的耐磨损性能，可以为材料的工程应用提供试验数据。 |
| 关键词: 锆合金 Cr 涂层 冲击-滑动 磨蚀 |
| DOI：10.11933/j.issn.1007-9289.20220105001 |
| 分类号:TG171 |
| 基金项目:四川省科技计划资助项目(2022JDJQ0019) |
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| Impact-sliding Wear Behavior of Cr-coated Zirconium Alloy |
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Zhang Qiang1, Li Sigong1, Zhou Teng2, Zhu Liting2
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1.China Nuclear Power Technology Research Institute, Shenzhen 518000 , China;2.Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031 , China
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| Abstract: |
| Rod-grid abrasion is a key failure mode of the nuclear fuel element, which may lead to fuel leakage and radioactivity release. Concerning the reactor safety operation, it is very important to study the friction and wear of the cladding material. As one of the ATF (accident tolerant fuel) candidate cladding material, the wear research on the Cr-coated zirconium alloy is not systematic and comprehensive. A new controllable energy impact-sliding wear testing machine is applied to study the effects of impact energy and cycle times on the abrasive damage behavior of Cr coating on zirconium alloys. The samples after the tests are characterized by white light interferometer, scanning electron microscope (SEM) and electron-probe micro-analysis (EPMA), and the mechanism of abrasion damage of Cr coating of zirconium alloy is explained. The wear of the specimen increases with the increase of the cycle number, but decreases with the increase of the impact energy. The Cr coating improves the interface contact stiffness and contact positive pressure values, and reduces the contact time during impact, thus reducing the wear of the cladding tube material. This paper focuses on the Cr-coated zirconium alloy abrasion in a low speed / high frequency mode, which may provide test data for engineering application. |
| Key words: zirconium alloy Cr coating impact-sliding fretting |
