| 摘要 |
PURPOSE:To improve stability in an oxidation-reduction atmosphere by forming, inside an interconnector tube, an insulating film as a reduction preventing film which is formed of material with a thermal expansion coefficient approximated to that of other component members. CONSTITUTION:An insulating film 5 which acts as a reduction preventing film is formed inside an interconnector tube (3) (fuel side) where it is exposed to a reduction atmosphere. As material of the film 5, SrZrO3 or La2Zr2O7 is used from a view point that it has a thermal expansion coefficient matching to that of other composition materials and insulating property. In this way, sets of unit cells each of which contains a fuel pole tube 1, an insulating intermediate material 2, the interconnector tube 3 provided with the insulating film 5 and a conductive intermediate material 4 are assembled overlapping each other and pressure-jointed at a high temperature in preset conditions to form one cylindrical joint. The deterioration of the conductivity of the tube 3 in a reduction atmosphere and the secular deterioration of operating voltage, in comprison of the conVEntional one can thus be prevented. |
