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用机械混合方法,在8%(摩尔分数,下同)Y2O3稳定的ZrO2(8%in mole yttria stabilized zirconia,8YSZ)中添加ZnO量分别为0,1%,2%,3%,4%,在不同温度下常压烧结制备了ZnO:8YSZ电解质。研究了烧结温度和ZnO含量对ZnO:8YSZ样品的烧结性、致密度、弯曲强度和电导率的影响。由ZnO:8YSZ电解质作为支撑组装了单电池,对电池的性能进行测试和评价。结果表明:在8YSZ中添加ZnO能改善8YSZ材料的烧结性,1400℃烧结2h的4%ZnO:8YSZ样品的致密度达99.9%,3%ZnO:8YSZ样品的弯曲强度超过200MPa,获得明显提高。4%ZnO:8YSZ样品在800℃下的电导率达1.68×10-2S/cm。在相同工作条件下,ZnO:8YSZ单电池比8YSZ单电池具有更好的工作性能和更高的效率,以3%ZnO:8YSZ单电池性能最好。
The amount of ZnO was 8% in mole yttria stabilized zirconia (8YSZ) by the mechanical mixing method. The amount of ZnO was 0,1%, 2%, 3%, 4% ZnO: 8YSZ electrolyte was prepared by atmospheric pressure sintering at different temperatures. The effects of sintering temperature and ZnO content on the sinterability, density, flexural strength and electrical conductivity of ZnO: 8YSZ samples were investigated. A single cell was assembled from ZnO: 8YSZ electrolyte, and its performance was tested and evaluated. The results show that the addition of ZnO in 8YSZ improves the sinterability of 8YSZ. The density of 4% ZnO: 8YSZ sintered at 1400 ℃ for 2h is 99.9% and the bending strength of 3% ZnO: 8YSZ is over 200MPa, which is obviously improved. The electrical conductivity of 4% ZnO: 8YSZ sample at 800 ℃ reached 1.68 × 10-2S / cm. Under the same operating conditions, ZnO: 8YSZ single cell has better performance and higher efficiency than 8YSZ single cell, with 3% ZnO: 8YSZ single cell performance is the best.