摘要
采用电弧离子镀在Ti65钛合金板材表面涂覆一种NiCrAlSiY涂层,并对其进行650℃~800℃的循环氧化实验,研究了这种涂层对板材抗氧化性能和室温力学性能的影响。结果表明,经500次循环氧化后涂覆NiCrAlSiY涂层的Ti65板材由涂层、扩散层和基材区三个区域组成,涂层与板材的结合界面比较致密,达到了完全抗氧化级别;涂层表面的氧化物以Al_(2)O_(3)为主,循环氧化温度升高到800℃在涂层表面开始出现TiO2氧化物。在循环氧化过程中涂层与板材间的元素扩散以Ni和Ti元素为主,循环氧化温度升高到800℃发生少量Cr元素扩散;Ni与Ti元素的互扩散导致在涂层与板材的结合界面生成了Ti_(2)Ni和TiNi。循环氧化后的板材其拉伸强度保持率高于90%,涂覆涂层板材的拉伸延伸率可达初始态板材延伸率的30%左右。供货态板材氧化后塑性较低的原因,可能是在高温下氧元素渗入板材表面产生了表面脆性。
Cyclic oxidation resistance is an essential factor affecting the reliable use of Ti65 Ti-alloy plates in aerospace vehicles.In this paper,the cyclic oxidation resistance of Ti65 plates was investigated by cyclic oxidation testing at 650℃~800℃.The results showed that the NiCrAlSiY coated Ti65 plate was composed of three regions after 500 cycles of oxidation test:coating,diffusion layer,and substrate region.The interface of coating/plate was relatively compact,and the coated plate exhibited a fully antioxidant level.The major oxide on the surface of coated plate was found to be Al_(2)O_(3),while TiO_(2)was detected when oxidation temperature increased to 800℃.During cyclic oxidation,the elements diffusion between coating and substrate were mainly Ni and Ti,while the diffusion of a small amount of Cr occurred when temperature increased to 800℃.The inter-diffusion of Ni and Ti were thought to lead to the generation of Ti_(2)Ni and TiNi at coating/plate interface.After cyclic oxidation,the tensile strength retention of both coated and as-received plates were more than 90%,while the elongation of coated plates was only about 30%of the original plates(before cyclic oxidation).The plates without coating were failed by brittle fracture after cyclic oxidation,obviously,the significant reduction of tensile elongation might be due to the brittleness caused by infiltration of oxygen element at high temperature on the plate surface.
作者
冯叶
陈志勇
姜肃猛
宫骏
单以银
刘建荣
王清江
FENG Ye;CHEN Zhiyong;JIANG Sumeng;GONG Jun;SHAN Yiyin;LIU Jianrong;WANG Qingjiang(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2023年第7期523-534,共12页
Chinese Journal of Materials Research
基金
国家科技重大专项(J2019-VI-0012-0126)
沈阳市科技计划项目(20-203-5-31)。
