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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

ZrO2的加入对(CeO2)0.86(SmO1.5)0.14陶瓷性能的影响

梁广川; 刘文西; 陈玉如; 杜春生; 邱颖   

  1. 天津大学材料学院, 天津 300130
  • 收稿日期:1999-08-30 修回日期:1999-11-04 出版日期:2000-10-20 网络出版日期:2000-10-20

Effect of Doping ZrO2 on the Properties of (CeO2)0.86(SmO1.5)0.14 Ceramics

LIANG Guang-Chuan; LIU Wen-Xi; CHEN Yu-Ru; DU Chun-Sheng; QIU Ying   

  1. College of Materials Science and Engineering; Tianjin University; Tianjin 300072; China
  • Received:1999-08-30 Revised:1999-11-04 Published:2000-10-20 Online:2000-10-20

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摘要： 探讨了添加 ＺｒＯ２对 ＣｅＯ２／Ｓｍ２Ｏ3体系电导率和力学性能的影响，并用 ＸＲＤ、ＳＥＭ等对材料的微观性能进行了试验分析．结果发现，添加 ＺｒＯ２使材料的电导率降低，主要是因为ＺｒＯ２的固清使得ＣｅＯ２电解质材料的晶格常数减小，活化能增加造成的；添加 ＺｒＯ２可提高材料的断裂强度，使材料断裂以穿晶断裂为主，其原因可能是ＺｒＯ２的固溶强化了晶界；添加 ＺｒＯ２促进了致密烧结，使晶界结合紧密．实验确定，外加 ２．５ｍｏｌ％ ＺｒＯ２的 ＣｅＯ２电解质具有适中的强度和电导率，可以作为电解质材料应用．

关键词: CeO2, 电解质, 电导率, 强度

Abstract: The effect of doping ZrO2 on the electrical conductivity and strength of CeO2/Sm2O3 ceramics was
investigated, and the microstructure of samples was studied and analyzed by means of XRD and SEM. The results showed that doping ZrO2 could decrease
the electrical conductivity. It was attribute to the reason that solution of ZrO2 in ceria-based electrolyte reduced the lattice constant. Doping ZrO2
increased the fracture strength and the fracture was intergranular for the reason that ZrO2 toughened the grain-boundary. Ceramics doped with ZrO2 were
dense as well. (CeO2)0.86(SmO1.5)0.14 doped with 2.5mol% ZrO2 may be a potential electrolyte material used for SOFC for its proper
electrical conductivity and strength.

Key words: ceria, electrolyte, electrical conductivity, strength

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