| 摘要 |
PURPOSE:To make precision control of the composition and suppress the costs by separately sintering a molding of electrode material and a specifically which dense film made of lanthanum chromate formed through doping of alkali earth metal, and adhering them with a humidity exceeding a certain level. CONSTITUTION:The green body of a thin film is made of doped lanthanum chromate with alkali metal by means of the tape casting method so that the film thickness lies between 5-200mum, and this is subjected to sintering to produce a dense thin film. As the alkali metal, Sr or Ca is used from the viewpoint of electroconductivity, and the ratio of the A site to B site shall favorably be 0.95-1 in order to have chemical stability. The sintering shall preferably take place at 1400-1600 deg.C in an atmosphere with the CrO3 vapor pressure put under control, which however is equipped with a waviness, and therefore, this must be flattened by applying a weight consisting of a flat plate. The resultant is pressed to a sintering of electrode material and adhered by heating at 1000 deg.C or more. Because of flexibility of the thin film, it is also possible to make adhesion with the peripheral surface of a cylindrical work for electrode. |
