LEAN-BURN TYPE EXHAUST GAS SENSOR

摘要

PURPOSE:To obtain a sensor having high sensibility, high responsiveness, and long durability by using a specified material for a resistance element and letting a solid electrolyte comprising stabilized zirconia function as an oxygen pump. CONSTITUTION:A resistance element comprising a material consisting of Sr(1+x)/2La(1-x)/2Co1-xFexO3 (where 0<=x<=0.3) contg. 20-60mol% SrTiO3 is formed on the surface of coating film 3 of one of confronting electrodes 2 of an oxygen pump comprising a solid electrolyte of stabilized zirconia covered by a porous film 3. Oxygen is extractad from the atmosphere covering said resistance element 4 by the oxygen pump comprising the solid electrolyte consisting of stabilized zirconia corresponding to the partial pressure of oxygen in the exhaust gas. A glass layer 7 is formed also on the external peripheral surface of the sensor except the surface of the oxygen pump side and the opposite side surface in order to keep the permeability at a low level.