Gas sensor contg. ceramic solid electrolytes, and method for making same

Application Number: 00109417
Application Date: 2000.06.22
Publication Number: 1278064
Publication Date: 2000.12.27
Priority Information: 1999/6/22 JP 175390/1999; 1999/12/28 JP 375808/1999; 1999/12/28 JP 375846/1999
International: G01N27/406;G01N27/407;G01N27/409;C04B35/48
Applicant(s) Name: NGK Spark Plug Co., Ltd.
Inventor(s) Name: Noda Yoshio;Imae Koichi;Kuroki Yoshiaki
Patent Agency Code: 11219
Patent Agent: zhu dehe
Abstract The invention provides 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. 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%.