黄铜脱锌腐蚀行为特征的电子探针分析

黄铜脱锌作为一种选择性腐蚀现象给生产和生活带来很大的安全隐患.添加一些合金元素可以改善脱锌现象,改善黄铜的耐腐蚀性能.使用岛津电子探针EPMA测试了某种含锡的黄铜,表征了其脱锌腐蚀行为特征,以及添加的合金元素锡的分布特征及其在提高黄铜耐腐蚀性能方面的作用,即脱锌腐蚀首先发生在暴露于基体表面的β相晶粒,然后通过晶界和相界...     

Development of a highly reliable helium refrigeration system––R&D of a highly reliable helium refrigeration system (conventional type)

The present paper reports the development of the refrigeration system that is applied to 70 MW class superconducting generators. The main subject in developing the refrigeration system for verification tests on site was to develop technology for removing impurities in helium gas, which largely affects its reliability, and to further improve the reliability and efficiency of its main components as screw compressors, turbo expanders, and a low temperature adsorber. Thus this paper deals with its planning and performance testing as well as automatic control in different modes of operation (such as cool-down, steady-state and heat run) and also the reliability analysis. It was verified that the developed refrigeration system demonstrated a higher reliability of 14,637 h mean time between failure, larger than 10,000 h. The total operation time at steady state has reached 9320 h with no failures in the entire testing period.     

电子探针在钕铁硼磁性材料表征中的应用

钕铁硼稀土永磁材料在新能源汽车等行业的电机领域中应用十分广泛。使用岛津电子探针波谱仪的点分析、线分析和面分析功能对钕铁硼磁性材料微区的基体相微观特征、化学组成和分布以及晶界扩散以提高矫顽力的工艺方法进行了直观地表征，可为磁体制备新技术和微观机理的阐述提供数据参考，对生产工艺的技术改进、质量管理和失效分析等整个过程可予以有效科学指导。     

电子探针在钕铁硼磁性材料表征中的应用

钕铁硼稀土永磁材料在新能源汽车等行业的电机领域中应用十分广泛.使用岛津电子探针波谱仪的点分析、线分析和面分析功能对钕铁硼磁性材料微区的基体相微观特征、化学组成和分布以及晶界扩散以提高矫顽力的工艺方法进行了直观地表征,可为磁体制备新技术和微观机理的阐述提供数据参考,对生产工艺的技术改进、质量管理和失效分析等整个过程可予以...