| 摘要 |
PURPOSE:To improve durability by improving the sintering of a heater by forming the heater on an unsintered ceramic substrate by using conductive paste containing elements in a platinum group which has specific surface area less than a prescribed value, and then performing the sintering. CONSTITUTION:Platinum powder having 0.46-9.90m<2>/g specific surface area and an organic vehicle[85-90wt% terpineol plus 15-10wt% ethyl cellulose (10cps)]are mixed at 6:4-8:2wt ratio and viscosity adjustment is performed to obtain conductive paste, which is applied onto an alumina unsintered substrate 1 by screen printing to form and dry a heater 2 in a prescribed shape. After platinum lead wires are mounted on terminal parts 2a and 2b of the heater 2 on the unsintered substrate 1, an unsintered substrate 4 similar to said unsintered substrate 1 is stacked and pressed to form an unsintered substrate 5. Further, a solid electrolyte for oxygen ion detection is stuck on the unsintered substrate 5 and baked at 1,500 deg.C, thus obtaining an oxygen sensor element. |
