1993 Fiscal Year Final Research Report Summary
Study on Fabrication of High Strength and High Ionic Conductive Cubic Zirconia Ceramics
| Project/Area Number |
03555168
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業物理化学・複合材料
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
SHIMADA Masahiko Tohoku University, Institute for Advanced Materials Processing, Professor, 素材工学研究所, 教授 (80029701)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Tetsuo Mitsubishi Materials Co., Cement Research Institute, Manager, セメント研究所, 所長補佐
TAKIZAWA Hirotsugu Tohoku University, Institute for Advanced Materials Processing, Research Associa, 素材工学研究所, 助手 (90226960)
ENDO Tadashi Tohoku University, Faculty of Engineering, Professor, 工学部, 教授 (30176797)
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| Project Period (FY) |
1991 – 1993
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| Keywords | High strength cubic zirconia / Alumina grain dispersed cubic zirconia / Scandia doped zirconia / Yttria doped zirconia / Electrolyte / Post-HIPing |
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| Research Abstract |
Y_2O_3-stabilized cubic zirconia ceramics is considered to be good candidate materials as an solid oxygen fuel cells (SOFC). However, the fracture strength and toughness of cubic zirconia are not enough high to apply to an electrolyte of planer-type SOFC.In the present study, fundamental research on fabrication of high strength and high ionic conductive cubic zirconia were investigated in ceramics/ceramics composites of tetragonal zirconia/cubic zirconia and alumina/cubic zirconia and Y_2O_3-Sc_2O_3 doped cubic zirconia systems In the system of tetragonal zirconia grains dispersed cubic zirconia composites of 5mol.%Y_2O_3 doped ZrO_2 fabricated at 1500。C in air for 12hr, the fracture strength and ionic conductivity (at 900。C) of composites were 525MPa and 0.05Scm^<-1>. The fracture strength and ionic conductivity (at 900。C) of 20vol.%Al_2O_3 grains dispersed cubic zirconia fabricated by post-HIPing were 355MPa and 0.06Scm^<-1>. On the other hands, fracture strength and ionic conductivity of 2mol%Y_2O_3-6mol%Sc_2O_3 doped cubic zirconia were 214MPa and 0.141Scm^<-1>. These present results indicated that high ionic conductive cubic zirconia with high fracture strength were excellent ceramics as an electrolyte of planer-type SOFC.
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