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To improve the conductivity of Y2O3-stabilized ZrO2 (YSZ) based oxygen-ion conductor, Zr0.85Y0.15O1.925-La9.33Si6O26 (YSZ-LSO) composite ceramics with the mass fraction of La9.33Si6O26 (LSO) of 15% were prepared by using a modified coprecipitation method. The phases, microstructures and conductivities of
the YSZ, LSO and YSZ-LSO were investigated by X-ray diffraction, electron microscopy and complex impedance, respectively.
The results show that the as-calcined powder of YSZ-LSO composite has the grain size less than 10 nm, and the as-sintered
composite ceramics are composed of YSZ and LSO phases. The conductivity can be enhanced obviously by composite method. At
700 °C, the conductivity of the composite ceramic is 0.125 S/cm, which is one order in magnitude higher than that of the YSZ
ceramic and two orders in magnitude higher than that of LSO ceramic. By analyzing the impedance spectra and modulus spectra,
the interfacial effect on the conductivity improvement was proposed. 相似文献
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为了提高Ce0.8Sm0.2O1.9(CSO)基氧离子导电材料的离子导电性,用2步化学共沉淀法制备Ce0.8Sm0.2O1.9La9.33 Si6O26(CSO-LSO)氧离子导电复合材料.通过X射线衍射分析材料的物相组成,利用扫描电子显微镜观察材料的微观形貌,利用交流阻抗分析测试材料的离子导电特性.结果表明,经300℃煅烧可得到纯相的CSO粉体,平均晶粒尺寸为9.8 nm.在整个测试温度范围内,CSO-LSO复合材料的氧离子电导率比单相CSO提高了10倍以上;700℃时,CSO-LSO复合材料电导率为0.12 S.cm-1,比CSO的总电导率(0.008 6 S·cm-1)提高约14倍.通过分析得出界面效应是提高复合材料电导率的主要因素. 相似文献
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Ni-Al合金凝固过程的分子动力学模拟 总被引:2,自引:1,他引:1
利用分子动力学研究Ni3Al和NiAl合金在不同冷速下的凝固过程,分析冷却过程中不同温度下的偶分布函数、能量和体积的变化.研究表明:冷却速率为4×1013 K/s时,Ni3Al形成非晶结构;冷却速率为4×1011 K/s时,Ni3Al在1 100 K左右结构开始发生变化,最终形成晶体结构.冷却速率为4×1013 K/s时,NiAl形成非晶;冷却速率为4×1011 K/s时,NiAl在810 K形成部分的晶体结构. 相似文献
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DVG850高速立式加工中心主轴箱灵敏度分析 总被引:3,自引:2,他引:1
基于Pro/Mechanical,以模态频率为性能指标,对DVG850高速立式加工中心主轴箱进行灵敏度分析,得出各设计变量对主轴箱第一阶固有频率的影响情况,根据主轴箱具体情况对灵敏度分析结果进行评价,为高速立式加工中心主轴箱结构改进或优化设计提供前提依据。 相似文献
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