发明名称 CHEMICAL PLATING METHOD, ELECTROLYTIC CELL AND AUTOMOTIVE OXYGEN SENSOR USING IT
摘要 An automotive lambda oxygen sensor (1) is formed by electroless plating of a thin, catalytically active, conductive electrode (39) uniformly on the outer surface of a zirconia thimble (31). The process includes forming a pristine zirconia solid electrolyte thimble (31) and drilling out a cylindrical cavity (37) in it. A porous outer surface (55) suitable for producing crystallization sites is formed by dipping the unfired thimble in a zirconia slurry containing spray-dried microspheres and firing the coated thimble to densify the thimble and the microspheres and to produce cavities (57) on the surface of the thimble. An inner platinum electrode (41) is formed by conventional conductive ink painting on the axial cavity of the sensor, and the sensor is again fired. The surface is activated by immersion in an acetone chloroplatinic acid bath to form multiple crystallization points, heat treated, then plated in an electroless platinum bath to a desired thickness. After plating, the sensor is heat treated and a conventional spinel glaze coat is flame sprayed over the sensor. The process produces sensors which consistently provide rapid response times and stable operation.
申请公布号 CA2307346(A1) 申请公布日期 1999.04.22
申请号 CA19982307346 申请日期 1998.10.15
申请人 GLOBAL SYSTEMS INCORPORATED 发明人 REIDMEYER, MARY R.;DONELON, MATTHEW J.;KILLION, ROBERT F.
分类号 C23C18/16;C23C18/42;G01N27/407;(IPC1-7):G01N27/407;C23C18/18;C23C18/31;G01N27/409 主分类号 C23C18/16
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