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Cr缺位对Pr0.7Ca0.3CrO3?δ基连接材料性能的影响
作者:卢肖永       陈永红 丁岩芝 
单位:(低温共烧材料安徽省重点实验室 淮南燃料电池材料工程技术研究中心 淮南师范学院 安徽 淮南 232001) 
关键词:固体氧化物燃料电池 陶瓷连接材料 烧结性能 导电性能 
分类号:O614.33
出版年,卷(期):页码:2019,47(7):0-0
DOI:
摘要:

 采用柠檬酸燃烧法合成一系列Pr0.7Ca0.3Cr1?xO3?δ连接材料,利用X射线衍射和扫描电子显微镜对材料的物相和微观形貌进行表征,四端子探针法测量样品的电导率,热膨胀仪测定热膨胀系数。结果表明:Cr缺位对材料Pr0.7Ca0.3CrO3-δ物相结构没有影响;Cr缺位提高材料的烧结性能。x=0.07的样品,1 400 ℃烧结5 h,相对密度达 98%;700 ℃时,样品在空气和氢气气氛的电导率分别为34和17 S/cm;样品的热膨胀系数为9.6×10–6/K,与YSZ (8mol%Y2O3-ZrO2)电解质的热膨胀系数接近。意味着Cr缺位Pr0.7Ca0.3Cr1?xO3-δ材料体系是固体氧化物燃料电池有潜力的陶瓷连接材料。

 A powder of Pr0.7Ca0.3Cr1-xO3-δ as an interconnect material was synthesized by a citric acid-nitrate self-propagating combustion method, and the phase and micro-morphology of materials were characterized by X-ray diffraction and scanning electron microscope. The conductivity of samples was measured by a direct current four-terminal method, and the thermal expansion coefficient was measured by a thermal dilatometer. The results indicate that Cr deficiency has no influence on the phase of Pr0.7Ca0.3CrO3-δ material and improves the sintering performance of the material. The relative density of the sample with x=0.07 sintered at 1 400 ℃ for 5 h is 98%. At 700 ℃, the conductivity of sample in air and hydrogen is 34 S/cm and 17 S/cm, respectively. The thermal expansion coefficient of the sample is 9.6×10–6/K, which is close to that of YSZ. It is indicated that Cr vacancy Pr0.7Ca0.3Cr1-xO3-δ material could be used as a potential candidate of ceramic interconnect material for solid oxide fuel cell.

基金项目:
国家自然科学基金项目(51202080);淮南师范学院自然科学重点研究项目(2018xj14zd)
作者简介:
参考文献:

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