片式氧传感器在生产过程中需要对 YSZ 与Al2 O3陶瓷进行叠层共烧,为保证内部多孔铂电极的功能,共烧温度不能高于1500℃。实验采用溶剂热法制备纳米级YSZ粉体,通过调节反应温度与反应物浓度降低合成YSZ粉末的烧结温度,使其1400℃烧结致密度达99．1％,500℃电阻率仅为11．5Ω?m；之后通过将 Al2 O3与 CaO、MgO、SiO2等烧结助剂混合方式降低 Al2 O3的烧结温度,并通过调整 Al2 O3粉体中α相与γ相的比例使其烧结收缩率与 YSZ 陶瓷匹配,500℃电阻率为1．3×104Ω?m。在1400℃范围内可以与YSZ实现共烧,得到不翘曲不开裂的双层共烧陶瓷,可以达到氧传感器的制备与使用要求。
YSZ/Al2 O3 bilayer ceramics should be co-fired during the producing process of planar oxygen sensors. To ensure the function of the porous platinum electrodes of the sensors,the co-firing temperature should not be higher than 1 500 ℃.YSZ nano-powders,prepared by solvothermal method with altered reaction temperature and reactant concentration,could be fully sintered under 1 400 ℃ with 99.1% sintered-density,and the electrical conductivity measured at 500 ℃ was 11.5Ω?m.The sintered temperature of Al2 O3 was reduced by introducing hybrid sintering aids,such as CaO,MgO,SiO2 .Then sintered shrinkage between Al2 O3 and YSZ was matched by adjusting the ratio ofα-phase andγ-phase of Al2 O3 ,and the electrical conductivity of Al2 O3 ceramic meas-ured at 500 ℃ was 1.3×104 Ω?m.Thus,the co-firing of YSZ/Al2 O3 under 1 400 ℃ was achieved,and non-warped-non-cracked bilayer ceramics were prepared to meet the demand of the preparation and usage require-ments for planar oxygen sensors.
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