| 摘要 |
PURPOSE:To effectively prevent the sintering of an electrode by a heat resisting substance, to improve responsiveness and low temperature operability, and also, to prevent contamination caused by a substance to be poisoned by forming an electrode of an oxygen sensor element by a platinum group metal in which the heat resisting substance is dispersed. CONSTITUTION:The title element consists of a structure in which a heat resisting substance is dispersed in a platinum group metal. Therefore, when an electrode is subjected to heat treatment, a fine (for instance, 0.1-1.0mum) hole can be formed. As for the reason why this hole is formed, it is considered that insufficient wetting of the heat resisting substance against the platinum group metal is one factor, and in this sense, it is desirable that the heat resisting substance of insufficient wetting against the platinum group metal is used. In such a way, as the result of a fact that many holes are formed in the electrode, the gas permeability is improved, and accordingly, the responsiveness is improved. |
