摘要
为研究CrAl涂层的高温氧化和拉伸行为,提高锆合金的抗高温氧化性能,采用多弧离子镀技术在锆合金表面制备CrAl涂层。利用高温热处理炉在360~1160℃和860~1160℃下分别对原始锆合金和带CrAl涂层锆合金进行氧化测试,研究二者的氧化增重行为。采用扫描电镜(SEM)和X射线衍射(XRD)对氧化前后样品的微观形貌、成分与相结构进行系统表征分析。通过原位拉伸测试对原始锆合金和带CrAl涂层试样的力学性能进行研究。结果表明:CrAl涂层氧化时通过形成致密的Al2O3和Cr2O3氧化层,显著降低了氧化增重,在1060℃高温下基体未被明显氧化。原位拉伸时CrAl涂层直到4%应变时才出现少量微裂纹,显示出较好的塑性变形能力,样品断裂前未见涂层剥落。多弧离子镀制备的CrAl涂层表现出优异的抗氧化性能,涂层与锆合金具有较好的力学相容性,该涂层具有发展成为事故容错燃料(ATF)包壳涂层的潜力。
To understand the oxidation and tensile behavior of CrAl coating, and improve the high temperature oxidation resistance of zircaloy, CrAl coating was deposited on zirconium alloys by multi-arc ion plating. Oxidation tests were conducted at different temperature from 360 °C to 1160 °C, and from 860 °C to 1160 °C for zirconium alloys and CrAl-coated Zircaloy in a high temperature heat treatment furnace, respectively. SEM and XRD were used to analyze the microstructure morphology, composition, and phase distribution before and after oxidation tests. In situ tensile tests were conducted to analyze the mechanical properties of zircaloy and CrAl coating. The results show the CrAl coating decreases the oxidation weight gain due to the dense Al2O3 and Cr2O3 oxide protecting, the substrate is not oxidized till a temperature up to 1060 °C.The CrAl coating shows microcracks till 4% tensile strain without peeling off before rupture. The CrAl coating exhibits excellent oxidation resistance and good mechanical properties, indicating that the CrAl coating is a potentially good candidate for accident tolerant fuel(ATF) cladding coating.
作者
位东辉
吴亚文
贺秀杰
马显锋
王辉
施惠基
WEI Donghui;WU Yawen;HE Xiujie;MA Xianfeng;WANG Hui;SHI Huiji(Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China;Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China;Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041, China;School of Aerospace, Tsinghua University, Beijing 100084, China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2019年第2期44-53,共10页
China Surface Engineering
基金
广东省教育厅青年创新人才项目(2016KQNCX005)
广东省重大科技专项(2017B020235001)
反应堆燃料及材料重点实验室基金~~
