| 摘要 |
In a method of manufacturing gas sensor elements each having a solid-electrolyte body and a protective layer, a radius R of the solid-electrolyte body is measured at a radius measurement position A of a protective-layer-forming surface of the solid-electrolyte body, a molten protective-layer material is sprayed on the protective-layer-forming surface by means of a plasma thermal-spraying equipment to form a protective layer, a radius S of the solid-electrolyte body inclusive of the protective layer is measured at a point B of intersection of a normal at the radius measurement position A with the surface of the protective layer, and the amount of spray of the protective-layer material in the plasma thermal-spraying equipment is controlled regarding a difference between the radius S and the radius R as the thickness of the protective layer and on the basis of this thickness, to form each protective layer in a desired thickness.
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