Characterisation of ceramic conversion treated zirconium 702 alloy
Zirconium alloys are attractive materials for their high corrosion resistance and good mechanical properties. However, their poor tribological properties have limited their applications under wear conditions. Surface engineering has been proved as a very effective way to address poor tribological properties of many materials. Thermal oxidation is considered as a promising cost-effective surface treatment for zirconium alloys to convert their surface into an oxide layer (i.e. ceramic conversion) with high hardness and improved wear resistance.In this study, a series of ceramic conversion treatments have been conducted on Zr7O2 zirconium alloy by thermal oxidation at temperatures ranging from 500 to 850℃ for 3-10 h. A wide range of material characterisation techniques were used to investigate the microstructure, composition, phase constituent, load bearing capacity and wear properties of the surface treated zirconium alloys. Experimental results show that after ceramic conversion treatments, the surface of Zr7O2 alloy can be converted to a ceramic layer consisting of -ZrO2 and -ZrO2; the optimal ceramic conversion treatment conditions for Zr7O2 alloy are interestingly in two different temperature ranges: (i) low temperature to form thin and dense oxide layer for mild wear conditions and high-temperature to form thick oxide layers for heavy load bearing wear conditions. The wear mechanisms of both untreated and ceramic conversion treated zirconium alloy are discussed.
Zirconium alloy thermal oxidation ceramic conversion characterisation
Xiaoying Li Ran Ji Thomas Plumer Hanshan Dong
School of Metallurgy and Materials, University of Birmingham, Edgebaston, Birmingham, B15 2TT, UK
国际会议
北京
英文
483-486
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）