The dominant phase ZrV2O7 material, doped with zirconia and vanadium (V) oxide, was synthesized by solid state reaction and sol-gel methods. X-ray power diffraction patterns show that it is cubic structure. Thermal me...The dominant phase ZrV2O7 material, doped with zirconia and vanadium (V) oxide, was synthesized by solid state reaction and sol-gel methods. X-ray power diffraction patterns show that it is cubic structure. Thermal mechanic analysis measurements exhibit a zero-thermal expansion of this material above 150 degreesC. Meanwhile, the heat capacity dependent on temperature, determined by differential scanning calorimetry, keeps in constant almost in the same temperature range. The relationship between unusual thermal expansion and abnormal heat capacity is discussed with Gruneisen parameter.展开更多
对于火电厂主蒸汽系统平行双闸板闸阀高温高压工况下密封性能恶化的这一技术难题,本文提出楔形补偿方案,采用15°楔形角动态补偿机构,由介质压力驱动自身完成热变形和密封应力的自适应匹配;零摩擦启闭结构、双向自增强密封面设计使...对于火电厂主蒸汽系统平行双闸板闸阀高温高压工况下密封性能恶化的这一技术难题,本文提出楔形补偿方案,采用15°楔形角动态补偿机构,由介质压力驱动自身完成热变形和密封应力的自适应匹配;零摩擦启闭结构、双向自增强密封面设计使应力波动减小了67%,5000次循环磨损量≤0.05 mm,泄漏率稳定在了0.007 mL/min之内,均优于工业标准ISO15848-1 Class VI标准值。工程使用表明,该技术可以将每年的维修费降低了82.8%,密封面粗糙度下降了50%,实现了无卡痕运转,为高参数机组阀门的设计提供了技术支持,极大提高了火电设备的长周期可靠运行。展开更多
基金the National Natural Science Foundation of China (No. 29971004), and the Funds of Ministry of Education of China for Assistant
文摘The dominant phase ZrV2O7 material, doped with zirconia and vanadium (V) oxide, was synthesized by solid state reaction and sol-gel methods. X-ray power diffraction patterns show that it is cubic structure. Thermal mechanic analysis measurements exhibit a zero-thermal expansion of this material above 150 degreesC. Meanwhile, the heat capacity dependent on temperature, determined by differential scanning calorimetry, keeps in constant almost in the same temperature range. The relationship between unusual thermal expansion and abnormal heat capacity is discussed with Gruneisen parameter.
文摘对于火电厂主蒸汽系统平行双闸板闸阀高温高压工况下密封性能恶化的这一技术难题,本文提出楔形补偿方案,采用15°楔形角动态补偿机构,由介质压力驱动自身完成热变形和密封应力的自适应匹配;零摩擦启闭结构、双向自增强密封面设计使应力波动减小了67%,5000次循环磨损量≤0.05 mm,泄漏率稳定在了0.007 mL/min之内,均优于工业标准ISO15848-1 Class VI标准值。工程使用表明,该技术可以将每年的维修费降低了82.8%,密封面粗糙度下降了50%,实现了无卡痕运转,为高参数机组阀门的设计提供了技术支持,极大提高了火电设备的长周期可靠运行。
