颗粒弥散Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)基复合透氧膜材料的制备、结构与性能研究  

Ba(Sr)Zr(CoFe)O_3-Particle-dispersed Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ) Mixed Conductor Composite

作　　者：李栋才[1] 刘卫[1] 宋春林[1] 江国顺[1] 陈初升[1] 

机构地区：[1]中国科学技术大学材料科学与工程系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2005年第2期241-246,共6页化学物理学报（英文）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina(20371045)

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%Zr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;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,因而升降温过中电导率热回滞峰较小.Dense oxygen permeable membranes are expected to have great impact on oxygen production and oxygen-involved industrial processes. Ba_ 0.5 Sr_ 0.5 Co_ 0.8 Fe_ 0.2 O_ 3-δ is of highest oxygen permeability at elevated temperatures. A novel composite ceramic preparation route for Ba_ 0.5 Sr_ 0.5 Co_ 0.8 Fe_ 0.2 O_ 3-δ was developed by directly produced stable BaZrO_3-based secondary phase particles(SPP) via addition of ZrO_2 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% ZrO_2+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% ZrO_2+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.

关 键 词：BSCF5582 颗粒复合 微结构 氧渗透 电导率 

分 类 号：TB383[一般工业技术—材料科学与工程]