Static oxidation behaviour of silicide coating on niobium alloy at high temperature
A silicide coating was prepared on the surface of the Nb521 alloy by the complex pack cemented method.The oxidation resistance properties of the present coating were examined by the static oxidation tests at 1 700 ℃ in air.The compositions and the microstructures of the coating before and after test were characterised and analysed through scanning electron microscopy (SEM),X-ray diffraction analysis (XRD),energy dispersive X-ray spectrometry (EDS) and electron probe microanalysis (EPMA),respectively.The present silicide coating can provide an effective protection for the Nb alloy for 25 h at 1 700 ℃ in air.The results show that the oxidation kinetics of the present silicide coating is parabolic.The diffusion of Si leads to the phase transformation and evolution during the oxidation.
niobium alloy silicide coating static oxidation diffusion phase transformation
XIAO Lai-rong XU Liang-liang YI Dan-qing LIU Hui-qun CAI Zhi-gang
School of Materials Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）