Fluorite-type Y2O2/ZrO2（YSZ） powders with the mean particle size of 1.74 μm were synthesized by the citric acid combustion method.Using the prepared YSZ powders,gas-tight hollow fibre membranes were fabricated by a...Fluorite-type Y2O2/ZrO2（YSZ） powders with the mean particle size of 1.74 μm were synthesized by the citric acid combustion method.Using the prepared YSZ powders,gas-tight hollow fibre membranes were fabricated by a dry-wet spinning process based on the phase inversion technique,followed by sintering at 1 400 ℃ for（4 h.） The gas tightness,porosity,mechanical strength,microstructure and crystalline phase of the hollow fibre membranes were studied.The results indicate that the prepared YSZ hollow fibre membranes are gas-tight while the porosity remains around 23.04% and the bending strength may be up to 322 MPa.The diameter of the pores in the hollow fibres ranges from 60 to 500 nm.XRD spectra show that the fluorite-type phase is kept unchanged,but the crystal size grows bigger after sintering.SEM micrographs show that the prepared YSZ hollow fibre membranes possess an asymmetric structure that includes a dense layer and porous layers,while the inner and outer surfaces are also dense.展开更多
基金financially supported by the National Key Research Program(2017YFB0306100)the Project of Guangdong Academy of Sciences(2017GDASCX-0843,2017GDASCX-0202)+2 种基金the Guangdong Science and Technology Research Project(2014B070706026)Guangdong Natural Science Foundation(2016A030312015,2017A030310315)Guangzhou Science and Technology Research Project(201605131008557,201707010385,201510010095)~~
文摘Fluorite-type Y2O2/ZrO2（YSZ） powders with the mean particle size of 1.74 μm were synthesized by the citric acid combustion method.Using the prepared YSZ powders,gas-tight hollow fibre membranes were fabricated by a dry-wet spinning process based on the phase inversion technique,followed by sintering at 1 400 ℃ for（4 h.） The gas tightness,porosity,mechanical strength,microstructure and crystalline phase of the hollow fibre membranes were studied.The results indicate that the prepared YSZ hollow fibre membranes are gas-tight while the porosity remains around 23.04% and the bending strength may be up to 322 MPa.The diameter of the pores in the hollow fibres ranges from 60 to 500 nm.XRD spectra show that the fluorite-type phase is kept unchanged,but the crystal size grows bigger after sintering.SEM micrographs show that the prepared YSZ hollow fibre membranes possess an asymmetric structure that includes a dense layer and porous layers,while the inner and outer surfaces are also dense.
