| 摘要 |
PURPOSE:To eliminate the need to separate reference gas and gas to be measured and simplify the structure by clamping both sides of oxygen ion conductive solid electrolytic ceramic between opposite electrodes and coating one electrode hermetically with ceramic made of the same material with the oxygen ion conductive solid electrolytic ceramic. CONSTITUTION:The oxygen ion conductive solid electrolytic ceramic 1 uses powder of zirconia, thoria, etc., and is shaped as part of a green sheet of a plane plate, rod, or pellet, etc., which is punched into a formed body 8 consisting of many parts. Electrodes 2 and 2' are formed on both surfaces of each part sectioned by a slit 9 through screen printing treatment by using, for example, platinum paste. Division pieces obtained by dividing the formed body 8 where no electrode is printed along slits 9 are stacked and pressed to a solid electrolyte 1 as a coating body 3, and further baked and sealed to obtain the oxygen thickness detecting element 3. A reduction flaw A and an oxidation flame B are separated from the detecting element 4 during normal combustion, and the reduction flame extends as shown by C in an oxygen deficient state to cover the detecting element 4. Consequently, it is not necessary to separate the reference gas and gas to be measured, and the structure is simplified. |
