The Sintering Behavior of ScZr-,SrCe-,AlYZr-oxides as Electrolyte Materials for Medium and Low Temperature SOFCs
Solid oxide fuel cells(SOFCs)generally work at high temperatures(300~1000℃)for electricity generation.The microstructure stability is very important for the durability of the fuel cells in long term operation.A sintering heat treatment is usually done at temperature To+ΔT(To is the operation temperature,ΔT = 500~700℃)to stabilize the microstructure.In this research,we chose three typical electrolyte materials,i.e.intermediate-temperature ScZr oxide(700~800℃),low-temperature SrCe oxide(400~600℃),and a new possible candidate AlYZr oxide.Tablets with diameter of 13 mm were made under 120~180 MPa pressure.Furnace sintering tests were done on those tablets at 1000 and 1500℃.The longest sintering time was 4 hours.X-ray diffraction was used to detect the phase transformation of the electrolyte materials due to sintering.After the sintering,pure cubic Sc0.2Zr0.8O1.9 phase was formed in ScZr oxides.The grains grew up from nano to micro size at 1500℃.In SrCe oxide,the main phase was cubic CeO2 and cubic SiTiO3 phases.In AlYZr oxide,both hexagonal Al2O3 and cubic Y3Al5O12 garnet phases(YAG)were detected forming eutectic microstructure.The development of the microstructures were studied in SEM with EDX analyses.
SOFC electrolyte sintering
Yuan Kang
BGRIMM Technology Group,Beijing 100160,China;BGRIMM Advanced Materials Science& Technology Co.,Ltd.,Beijing 102206,China;Beijing Engineering Technology Research Center of Surface Strengthening and Repairing of Industry Parts,Beijing 102206,China
国际会议
北京
英文
1812-1816
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）