首秦X70管线钢夹杂物成分研究

根据ASTME45-2005标准中对非金属夹杂物的分类方法,使用扫描电子显微镜和能谱仪对首秦公司生产的13．7mm厚X70管线钢中典型夹杂物的化学成分进行定量检测,并做出元素的面分布图。确认了X70中的A类夹杂物是单纯的MnS;B类夹杂物是CaO—Al2O3复合氧化物,伴随少量的MgO和CaS;D类夹杂物是MgO-Al2O3颗粒被CaO—Al2O3包裹形成的,表面有一个CaS外壳;析出物是以Ti、Nb的氮化物为主。并讨论了各种夹杂物的控制措施。     

Preparation and luminescence properties of Ce3＋/Dy3＋-codoped fluorosilicate glass ceramics

The Ce3+and Dy3+ co-doped fluorosilicate glass and glass ceramics containing SrF2 or CeF3 nanocrystals were prepared under re-ducing atmosphere. The precipitated nano-crystalline phase shifted from cubic SrF2 to hexagonal CeF3 gradually with the heat treatment tem-perature increasing from 620 to 680 °C. The glass and glass ceramics emitted white light, deriving from a combination of the Ce3+ blue and the Dy3+ yellow light. The CIE coordinates could be tuned by adjusting the ratio of Ce3+/Dy3+ concentration. The luminescence could be en-hanced significantly by annealing the samples at the temperatures lower than 640 °C.