| 摘要 |
PURPOSE:To improve the stability and durability of an element by impregnating a ceramic substrate where a thick porous gas sensing body film is formed by coating with a solution of a platinum compound, and carrying out a heat treatment in a gaseous hydrogen furnace and depositing platinum between an electrode and the thick film on the substrate. CONSTITUTION:Patterns 44 and 49 of platinum paste are printed in thick films on a green sheet 40 and platinum lead wires 51 and 53 are further connected. Then a green sheet 41 with an opening 55 is laminated and other green sheets 42 and 43 are also laminated in steps. Then this laminate plate is calcined in an atmosphere, TiO2 paste is charged in the opening 55, and the plate is calcined again to form a detecting element 11 of a porous gas sensing body. Then a chloroplatinic acid solution is dripped on the detecting element 11, which is calcined in a hydrogen atmosphere. Consequently, a conductive material formed by the condensation deposition of platinum is interposed in the TiO2- electrode interface to improve the stability of the operation and the durability of the gas sensing body element.
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