固体電解質型燃料電池用ガスセパレーターの開発 : MgO/MgAl_2O_4複合材とLaCrO_3の接合

概要

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One of the features of Mitsui-type solid oxide fuel cells(SOFC)is that the gas separators are made of MgO/MgAl_2O_4 composite ceramics, onto which several LaCrO_3 ceramics are joined so as to connect the cells electrically in series. Since one of the functions of the gas separator is the separation of fuel gas and oxidant gas, the joining interface of MgO/MgAl_2O_4 composite and LaCrO_3 must maintain gas tightness at the operating temperature over 1200 K for a long term. The authors developed a ceramic joining technique according to which a ceramics slurry is coated on the joining surfaces and then firing is performed at 1773 K. The average bending strength of the joints was 65 MPa at 1273 K. The joining interface held gas tightness against four thermal cycles from 1773 K to room temperature. The vicinity of the joining interface showed an altered qualiy due to the joining process. However, the altered area was not extended and the interface held gas tightness for not less than 8000 h under the operating condition of the SOFC.
社団法人日本セラミックス協会の論文
1999-04-01