摘要
采用超音速火焰喷涂技术(High velocity oxygen fuel, HVOF)在Zr-4合金表面制备Cr涂层,在700℃退火2 h,在水蒸汽环境中进行1000℃高温氧化试验,采用豪斯天平密度测定组件测量涂层致密度,研究退火对Cr涂层孔隙率的影响。结果表明,退火可以明显提高Cr涂层致密度,弥补采用超音速火焰喷涂在试验参数下制备的涂层孔隙率高的问题,但其对涂层与基体界面无明显改变。退火处理后的Cr涂层抗氧化性能优于未退火样品,说明涂层制备后采用适当的热处理工艺可以达到改善涂层微观结构、提高涂层致密度以提升Cr涂层抗高温氧化性能的效果。
Cr coating was prepared on Zr⁃4 alloy by supersonic flame spraying(high velocity oxygen fuel,HVOF),annealed at 700℃for 2 h,and oxidized at 1000℃in water vapor environment,and the densities of the coating were measured by a Haus balance density measurement kit to investigate the effect of annealing on the porosity of Cr coatings.The results show that annealing can significantly improve the Cr coating density and compensate for the high porosity of the coating by HVOF with the experimental process parameters.There is no significant change in the interface between the coating and the substrate.The oxidation resistance of the annealed Cr coating is better than that of the unannealed specimen.It indicates that appropriate annealing after coating preparation can enhance the oxidation resistance at high temperature by increasing the coating densities and improving the coating microstructure.
作者
李志康
王全伟
申晓凤
黄娇
樊立峰
马文
张鹏省
Li Zhikang;Wang Quanwei;Shen Xiaofeng;Huang Jiao;Fan Lifeng;Ma Wen;Zhang Pengxing(Inner Mongolia Key Laboratory of Thin Film and Coatings,School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;Engineering Research Center of Rare Earth Metals,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;Northwest Institute for Nonferrous Metal Research,Xi'an Shaanxi 710016,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第1期262-267,共6页
Heat Treatment of Metals
基金
内蒙古自治区自然科学基金(2020BS05011)
内蒙古工业大学校级自然科学基金(BS201905)。
