江汉大学学报（自然科学版）

为了减少废气中杂质在汽车氧传感器芯片电极上沉积和发生化学反应的损害,提高芯片的稳定性和寿命,通过丝网印刷的方式,在电极表面增加多孔保护层。通过对造孔剂种类、粒径、含量以及配方优化来调整保护层的孔隙。优化的条件为:优选钇稳定氧化锆8YSZ作为粉体材料、5μm聚甲基丙烯酸甲酯(PMMA)微球为造孔剂、造孔剂含量为15%、胶含量为6%、固含量为39. 39%、粘接剂树脂优选为15%EC4+10%EC45的乙基纤维素。在优化条件下配制的保护层浆料烧结后孔隙多、孔径均匀;平均孔径为2. 44μm,有利于保护层对废气起到较好的"过滤"作用。

In order to reduce exhaust gases impurities damaging of deposition and chemical reaction on the electrode of automobile lambda sensor chip,and to improve stability and longevity of chip,porous protective layer on electrode surface was made by the way of screen printing. The pores of protective layer were adjusted by optimizing pore former type,particle size,content and slurry formula. The optimum conditions were as below:Yixing8 YSZ was selected preferably as powder material,5 μm polymethyl methacrylate(PMMA)microspheres was selected preferably as pore former,pore former content was 15%,resin content was 6%,solid content was 39. 39%,15% ethyl cellulose(EC4) and 10% ethyl cellulose(EC45) were selected preferably as adhesive resins. Protective layer slurry was prepared with the optimized conditions. It forms many and uniform size pores after sintering;average aperture was 2. 44 μm,and it is beneficial to make the protective layer play a better role of ″filtration″ for exhaust gases.