Sm2（Zr1-xCex）2O7 （x=0.1, 0.2, and 0.3） ceramics were prepared by solid reaction method at 1600°C for 10 h using Sm2O3, ZrO2, and CeO2 as starting reactants. The phase compositions, microstructures, thermal ex...Sm2（Zr1-xCex）2O7 （x=0.1, 0.2, and 0.3） ceramics were prepared by solid reaction method at 1600°C for 10 h using Sm2O3, ZrO2, and CeO2 as starting reactants. The phase compositions, microstructures, thermal expansion coefficients, and partial thermal conductivities of these materials were investigated. X-ray diffraction （XRD） results reveal that Sm2（Zr0.9Ce0.1）2O7 with pyrochlore structure and Sm2（Zr1-xCex）2O7 （x=0.2 and 0.3） with fluorite structure were synthesized, and scanning electrical microscopy （SEM） images show that the microstructures of these products are very dense. The linear thermal expansion coefficients increase with increasing temperature in the temperature range from ambient to 1200°C, and the thermal expansion coefficients increase with increasing content of doped CeO2. The thermal conductivities of Sm2（Zr0.8Ce0.2）2O7 and Sm2（Zr0.7Ce0.3）2O7 decrease gradually with an increase in temperature. These results show that the synthesized ceramic materials can be explored as novel prospective candidate materials for use in new thermal barrier coating systems in the future.展开更多
基于NEDC(New European Driving Cycle,新欧洲驾驶循环)工况将某款电机系统的实际工况点分为电动工况点和发电工况点,并采用Python数据处理工具分别计算电动工况点的消耗能量和发电工况点的发电能量,根据二者的能量分布,确定重点优化区...基于NEDC(New European Driving Cycle,新欧洲驾驶循环)工况将某款电机系统的实际工况点分为电动工况点和发电工况点,并采用Python数据处理工具分别计算电动工况点的消耗能量和发电工况点的发电能量,根据二者的能量分布,确定重点优化区间,将优化后数值带入模型进行仿真,结果表明,优化后电动平均效率提升1%、发电平均效率提升1.58%、续驶里程提升1.3%,验证了电机系统平均效率优化方法的有效性。展开更多
基金supported by the Doctor Research Fund of Henan Institute of Engineering (No. D2007012)
文摘Sm2（Zr1-xCex）2O7 （x=0.1, 0.2, and 0.3） ceramics were prepared by solid reaction method at 1600°C for 10 h using Sm2O3, ZrO2, and CeO2 as starting reactants. The phase compositions, microstructures, thermal expansion coefficients, and partial thermal conductivities of these materials were investigated. X-ray diffraction （XRD） results reveal that Sm2（Zr0.9Ce0.1）2O7 with pyrochlore structure and Sm2（Zr1-xCex）2O7 （x=0.2 and 0.3） with fluorite structure were synthesized, and scanning electrical microscopy （SEM） images show that the microstructures of these products are very dense. The linear thermal expansion coefficients increase with increasing temperature in the temperature range from ambient to 1200°C, and the thermal expansion coefficients increase with increasing content of doped CeO2. The thermal conductivities of Sm2（Zr0.8Ce0.2）2O7 and Sm2（Zr0.7Ce0.3）2O7 decrease gradually with an increase in temperature. These results show that the synthesized ceramic materials can be explored as novel prospective candidate materials for use in new thermal barrier coating systems in the future.
文摘基于NEDC(New European Driving Cycle,新欧洲驾驶循环)工况将某款电机系统的实际工况点分为电动工况点和发电工况点,并采用Python数据处理工具分别计算电动工况点的消耗能量和发电工况点的发电能量,根据二者的能量分布,确定重点优化区间,将优化后数值带入模型进行仿真,结果表明,优化后电动平均效率提升1%、发电平均效率提升1.58%、续驶里程提升1.3%,验证了电机系统平均效率优化方法的有效性。
