562015-03-24 , 法政大学大学院理工学・工学研究科
Weight changes of CeO2–Al2O3 sintered composite and CeO2 powder in Ar-5%H2 and N2-20%O2 atmospheres were evaluated by thermogravimetry. The weight change of CeO2 in CeO2–Al2O3 sintered composite was less than that of CeO2 powder, implying that valence change of CeO2 was inhibited in the composite. To form bonding layer of CeO2-Al2O3 composite between yttria-stabilized zirconia (YSZ) and stainless alloy, Al interlayer dispersed with CeO2 particles was placed between them, and heat-treated by a pulsed electric current sintering equipment. YSZ and stainless alloy were successfully joined, and Al2O3 interlayer dispersed with CeO2, whose thickness was 1.6 μm, were formed. Oxygen gas seal property were measured by electrochemical method for a YSZ/stainless alloy joint fabricated by infrared furnace. Oxygen gas leak rate was determined to be 6.61×10-8 mol /s・cm.