| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas sensor element which can improve water resistance and sufficiently secure poisoning resistance, and which can prevent cracks or peeling of a surface protective layer caused by evaporation of moisture contained inside, and to provide a gas sensor using the same. <P>SOLUTION: A gas sensor element 1 has an element body part 10 which includes: an oxygen ion conductive solid electrolyte 11; a measuring electrode 12 and a reference electrode 13 provided on the solid electrolyte 11; a diffusion resistance layer 14 transmitting gas to be measured; and a heater part 170 provided with a heating element 171. On a gas introduction external surface 141 introducing the gas to be measured in the diffusion resistance layer 14 of the element body part 10, a porous protective layer 2 for trapping poisoning components in the gas to be measured and a surface protective layer 3 are provided. The surface protective layer 3 is formed on the porous protective layer 2, has water repellency at a high temperature where the solid electrolyte 11 is activated, and has porosity smaller than that of the porous protective layer 2. The surface protective layer 3 is formed in such a manner that a part of the porous protective layer 2 is exposed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
