Mechanical properties of ceria based oxygen ionic conductors for SOFC

研究成果: Conference contribution

抄録

The fracture strength and creep rate of rear earth (Y and Gd) doped ceria are systematically studied from the viewpoints of dopant concentration, oxygen partial pressure and temperature dependences. Fracture strength and creep rate are measured by modified small punch test and four point bending method, respectively. From results of fracture test, the highest fracture strength is obtained on the samples sintered at 1600 °C for Y and Gd-doped CeO 2. The unique temperature dependence of fracture strength on doped CeO2 is observed. It shows the local minimal value at around 600 °C and the fracture strength increases with increasing temperature. The fracture surface structure drastically changes with changing temperature observed by SEM. Since we observed the close coincidence between the fracture strength and the ratio of transcrystalline fracture surface for all samples, it is concluded that the increase of fracture strength at high temperature in doped CeO2 can be attributed to the temperature dependence of transcrystalline fracture strength. Typical creep curves of 2, 5, 10 and 20 YDC were measured under constant load in air. The creep rate decreases with increasing the dopant concentration. From the analysis of creep properties, the creep is controlled by cerium vacancy diffusion and change of ceria vacancy concentration decreases creep rate.

本文言語English
ホスト出版物のタイトルProceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology
ページ85-91
ページ数7
DOI
出版ステータスPublished - 2008 12 1
イベント6th International Conference on Fuel Cell Science, Engineering, and Technology - Denver, CO, United States
継続期間: 2008 6 162008 6 18

出版物シリーズ

名前Proceedings of the 6th International Conference on Fuel Cell Science, Engineering, and Technology

Other

Other6th International Conference on Fuel Cell Science, Engineering, and Technology
国/地域United States
CityDenver, CO
Period08/6/1608/6/18

ASJC Scopus subject areas

  • エネルギー工学および電力技術
  • 燃料技術

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