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    • 4. 发明授权
    • Oxygen concentration detector having heat-treated support layer
providing high responsivity endurance
    • 具有热处理支撑层的氧浓度检测器提供高响应能力
    • US5472591A
    • 1995-12-05
    • US305712
    • 1994-09-14
    • Toshitaka SaitoNamitsugu FujiiYasumichi HottaSatoru NomuraHiromi SanoMasatoshi Suzuki
    • Toshitaka SaitoNamitsugu FujiiYasumichi HottaSatoru NomuraHiromi SanoMasatoshi Suzuki
    • G01N27/409G01N27/407
    • G01N27/4075
    • An oxygen concentration detector provides high durability by increasing the thermal stability of coating layers applied to an electrode face thereof. A catalyst layer is formed on an outer surface of an electrode at the analysis gas side of a partition wall made of an ion oxygen conductive ceramic for generating electromotive force according to the difference between the concentration of oxygen in the analysis gas and the concentration of oxygen in the reference gas. The catalyst layer is composed of heat resistant ceramic particles and a particulate metallic catalyst made of platinum, rhodium or the like, supported by the surface of the heat resistant ceramic particles. The catalyst layer is formed so that the catalyst is supported by the heat resistant support particles. The support particles are heat treated to grow to a particle size so that particle growth can be restrained when the support particles are exposed to the exhaust gas from an internal combustion engine. The outside of the electrode of the partition wall is covered with support particles having such heat treated large cohered catalyst particles, and good responsivity of the sensor is thereby maintained.
    • 氧浓度检测器通过增加施加到其电极面上的涂层的热稳定性而提供高耐久性。 催化剂层形成在由离子氧传导陶瓷制成的分隔壁的分析气体侧的电极的外表面上,用于根据分析气体中的氧浓度与氧浓度之间的差产生电动势 在参考气体中。 催化剂层由耐热陶瓷颗粒和由耐热陶瓷颗粒的表面支撑的由铂,铑等制成的颗粒状金属催化剂组成。 催化剂层形成为使得催化剂被耐热支撑颗粒支撑。 支撑颗粒被热处理以生长成粒径,使得当载体颗粒暴露于来自内燃机的废气时,可以抑制颗粒生长。 分隔壁的电极的外侧覆盖有具有这种经热处理的大型粘结催化剂颗粒的支撑颗粒,从而保持传感器的良好的响应性。