预氧化锆合金包壳在高温高压水中的微动磨损行为研究  

Study on Fretting Wear Behavior of Pre-oxidized Zircaloy Cladding in High Temperature and High Pressure Water

作　　者：王俊 王志国 蔡振兵[1] 李正阳 任全耀 刘晓红 焦拥军[2] Wang Jun;Wang zhiguo;Cai Zhenbing;Li Zhengyang;Ren Quanyao;Liu Xiaohong;Jiao Yongjun(Tribology Research Institute,Southwest Jiaotong University,Chengdu,610031,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]西南交通大学摩擦学研究所,成都610031 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2024年第5期142-154,共13页Nuclear Power Engineering

基　　金：国家重点研发计划项目(2022YFB3401901);国家自然科学基金重点项目(U2067221);四川省科技计划(2022JDJQ0019,2022ZYD0029);船舶振动噪声重点实验室项目(6142204210707,JCKY2022207CI10)。

摘　　要：为深入研究在实际服役过程中包壳随氧化时间变化后的微动磨损情况,采用过热水蒸气氧化的手段制备了多种预氧化包壳,并使用自制的高温高压切向微动磨损试验机开展了模拟压水堆运行工况的微动磨损试验,测量了基材以及经过不同时间预氧化后包壳的体积磨损系数。研究结果表明,预氧化之后包壳表面硬度比基体提高了2~3倍,而磨损系数降低了约90%。在包壳表层生成的一层致密氧化层是导致其磨损系数变化的重要原因,氧化时间越长,氧化层越厚,氧化时间为200 d的包壳磨损系数最低。此外,氧化层的存在导致锆合金包壳在高温高压水环境下的微动磨损机理从严重磨粒磨损和分层转变为轻微磨粒磨损和粘着磨损。To further study the fretting wear of of claddings with the change of oxidation time in practical service,a variety of pre-oxidized claddings were prepared by superheated steam oxidation.In this study,a self-made high-temperature and high-pressure tangential fretting wear tester was used to carry out fretting wear tests simulating the operation conditions of PWR,and the volume wear coefficients of the substrate and the cladding after pre-oxidation at different times were measured.The results show that the surface hardness of the cladding is 2~3 times higher than that of the substrate,and the wear coefficient is reduced by about 90%.A dense oxide layer formed on the surface layer of cladding is an important reason for the change in its wear coefficient.The longer the oxidation time,the thicker the oxide layer,and the cladding with an oxidation time of 200 d has the lowest wear coefficient.In addition,the existence of oxide layer causes the fretting wear mechanism of zircaloy cladding to change from serious abrasive wear and layering to slight abrasive wear and adhesive wear in high temperature and high pressure water environment.

关 键 词：预氧化 锆合金 高温高压水 微动磨损 

分 类 号：TL34[核科学技术—核技术及应用]