| 摘要 |
PURPOSE:To improve durability by a method wherein a catalyst layer composed of heat resisting inorganic material is formed on the external surface of a disk shaped sintered material of transition metal oxide. CONSTITUTION:A pair of lead wires 2 composed of platinum/rhodium having fire resistance are buried in the direction of diameter of the disk shaped sintered material 1 molded and sintered from transition metal oxide well sensitive to the variation of oxygen concentration in the exhaust gases such as TiO2, Nb2O5, and CeO2. Catalyst layer 3 is formed with the coating thickness of 10-30mu on the external surface of disk shaped sintered material 1 and the catalyst layer 3 carries 3-10wt% of the required catalyzer noble metal Pt/Rh in the 100% aluminum. And then, the obtained sensor element 4 is fitted at the point of an approximate cylindrical aluminum porcelain tube to make an oxygen sensor. Thereby, the composition of the exhaust gas is correctly sensed for a long period. |
