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Ba(Sr)Zr(CoFe)O3 Particle dispersed Ba0.5Sr0.5Co0.8Fe0.2O3-δMixed Conductor Composite
Li Dongcai,Liu Wei*,Song Chunlin,Jiang Guoshun,Chen Chusheng
Author NameAffiliationE-mail
Li Dongcai Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026  
Liu Wei* Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 wliu@ustc.edu.cn 
Song Chunlin Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026  
Jiang Guoshun Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026  
Chen Chusheng Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026  
Abstract:
Dense oxygen permeable membranes are expected to have great impact on oxygen production and oxygen involved industrial processes. Ba0.5Sr0.5Co0.8Fe0.2O3-δ is of highest oxygen permeability at elevated temperatures. A novel composite ceramic preparation route for Ba0.5Sr0.5Co0.8Fe0.2O3-δ was developed by directly produced stable BaZrO3 based secondary phase particles(SPP) via addition of ZrO2 and iso molar excess BaO, aiming at improving mechanical properties. It revealed that as synthesized composites could get a well developed and fine grained microstructure, there being secondary phase particles as the grain growth inhibitor, and the mechanical properties and oxygen permeation are improved. For the composite with addition of 10% ZrO2+10% BaO, a well developed and fine grained microstructure has been obtained. Compared to the pure phase BSCF5582, the three point bending strength of the composite with addition of 5% ZrO2+5% BaO increases by 68% and its oxygen permeation rate is much higher below 850℃ with the smaller apparent activation energy. Additionally, the electrical properties of the composites are also affected by the inclusion of SPP: conductivity decreases with the SPP content increasing, while the hysteresis of conductivity declines due to the relative stable carrier concentration.
Key words:  BSCF5582, Particles dispersed, Microstructure, Oxygen permeation, Electrical conductivity
FundProject:
颗粒弥散Ba0.5Sr0.5Co0.8Fe0.2O3-δ基复合透氧膜材料的制备、结构与性能研究
李栋才,刘卫*,宋春林,江国顺,陈初升
摘要:
通过外加等摩尔分数的ZrO2和过量BaO,原位生成一定比例的BaZrO3基第二相颗粒复合的制备方法,对具有较高氧渗透率的Ba0.5Sr0.5Co0.8Fe0.2O3-δ进行了原位引入Ba(Sr)Zr(CoFe)O3第二相颗粒的改性研究.发现引入的第二相颗粒不但具有抑制基相晶粒的生长、细化和均化基相晶粒的作用,同时减小了基相高温氧脱附量而起到稳定相结构的作用.引入5%ZrO2和5%过量BaO复合物的抗弯强度比纯相提高68%;引入10%ZrO2和10%过量BaO、 20%ZrO2和20%过量BaO的复合物(均为摩尔分数),在850℃以下具有更高的氧渗透率;复合物的电导率随第二相颗粒含量的增加而减小;氧脱附量较小的复合物的载流子浓度相对稳定,因而升降温过程中电导率热回滞峰较小.
关键词:  BSCF5582  颗粒复合  微结构  氧渗透  电导率
DOI:10.1088/1674-0068/18/2/241-246
分类号: