牛少鹏,周克崧,邓畅光,徐丽萍,毛杰,杨焜,曾威,陈志坤,陈龙飞

• 1:广东省新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室广东省科学院

摘要(Abstract)：

采用超音速等离子喷涂方法制备出了La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF-6428)非对称型透氧膜。利用双聚焦离子束、扫描电镜、透射电镜、X射线衍射仪等手段观测膜层微观结构和物相成分,重点考察膜层高温结构稳定性和抗CO_2腐蚀性能。采用四探针法测电导率比较SAPS膜和传统烧结膜的电子传导性能。结果表明,SAPS膜结构致密程度较高,膜层内部富含纳米晶粒,并呈现"微纳晶-纳米晶-超细纳米晶"顺序叠加结构。膜经历850℃,30次热循环测试和25 h持续加热测试后仍维持较高的致密度,表现出较好的结构稳定性。膜层在静态CO_2气氛下,500℃时即开始相分解,且随着温度升高,相分解加速,到900℃时相分解快速完成并终止。相比之下,膜层在950℃,CO_2吹扫气氛下相分解速率明显减慢,在经历2h加热后仅发生轻微分解。四探针法测得SAPS膜常温电导率达到0. 28 (Ω·cm)~(-1),高出烧结膜一个数量级。进一步研究表明,SAPS膜晶格发生膨胀,引发膜层内部极化子尺寸增大,有助于内部电子的迁移。

关键词(KeyWords)： 超音速等离子喷涂;非对称型透氧膜;纳米晶;高温稳定性;极化子

Abstract:

Keywords:

基金项目(Foundation): 广东省科学院创新专项(2018GDASCX-0949);; 广州市科技计划项目(201707010455);; 广东省新材料研究所创新能力建设项目(2017A070701027)

作者(Author): 牛少鹏,周克崧,邓畅光,徐丽萍,毛杰,杨焜,曾威,陈志坤,陈龙飞

DOI: 10.13289/j.issn.1009-6264.2019-0146

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