| 摘要 |
PROBLEM TO BE SOLVED: To provide a ceramic laminate consisting of a substrate made of insulating ceramic and a solid electrolyte layer, suppresses the generation of a crack, and is firmly joined, and to provide an oxygen sensor element using the ceramic laminate. SOLUTION: A ceramic laminate consisting of an alumina substrate 1 and a solid electrolyte layer 6 being jointed to the alumina substrate is obtained. The solid electrolyte layer is made of zirconia containing alumina of 10 to 80 wt.%, especially, 30 to 50 wt.%. Also, other ceramics layers, especially, a ceramics layer 7 made of the alumina, may be joined to the solid electrolyte layer. The relative density of the ceramics layer is 60 to 99.5%, preferably, 80 to 99.5%. In an oxygen sensor element, a heater is provided inside the alumina substrate, a reference electrode 4 made of platinum or the like is formed on one surface of the solid electrolyte layer, and a measurement electrode 5 made of the platinum or the like is formed on the other. |
