The growth of oxide platelets on nickel in pure oxygen. II. Surface analyses and growth mechanism

The structural properties of NiO platelets emerging from a primary oxide layer by oxidation of pretreated nickels in pure oxygen between 650 and 800° C have been investigated in relation with the initial metallic layers and the primary oxide. Surface composition and segregation of impurities were also studied by X-ray photoelectron spectroscopy and Auger electron spectroscopy. Textural properties and structural orientation of both the primary oxide layer and the platelets were analyzed by X-ray diffraction and transmission electron microscopy. Platelets grew along {111} planes, leading to elliptical or semicircular bicrystals. The driving force for the present type of growth originates from the stresses accumulated in the thin, primary oxide layer. Impurities do not directly interact with this growth, but enable a specific grain structure to be developed thereby favoring platelet growth.     

磁选柱再选工艺在板石矿业公司选矿厂的应用

介绍了磁选柱的结构、选别机理，阐述了通钢集团板石矿业公司选矿厂为提高精矿品位，对现有选别工艺流程进行的磁选柱再选工艺改造，总结了工业试验和生产实践所取得的经济技术指标，并进行了经济效益评价。     

掺杂一维光子晶体的杂质态

阐述了无缺陷光子晶体与掺杂光子晶体的结构,用光学特征矩阵方法,通过数值模拟计算具体讨论了一维光子晶体的一个实例。计算结果表明,掺杂光子晶体的禁带出现了极窄的、高透射率的尖峰,即光子杂质态,类似于半导体材料中的杂质能级。杂质层的引入增宽了原来光子禁带的宽度,杂质态的特征与杂质层的光学厚度、折射率及在晶体中的位置等因素有关。     

火焰原子吸收光谱法测定锡锭中痕量杂质元素

采用空气———乙炔火焰原子吸收光谱法测定纯锡锭中痕量元素铁、铜、铅、铋、锑。以HCl+H2O2沸水浴蒸干排Sn处理,使Sn挥发与待测元素分离消除基体干扰。此方法应用于实际样品的测定,结果令人满意。     

Diffusion Growth Model of Doping—impurity Longitudinal Profile in Grown Material by MOCVD and Chloride VPE

The program process of the longitudinal impurity profile introduced in the quantum well(QW)laser and microwave electronic materials in analysed,based on the growth system by metalorganic chemical vapor deposition(MOCVD)and microwave electronic materials and chloride vapor phase epitaxy(VPE).The quantitative solution of the final longitudinal direction impurity distribution using the mathematical physics model of impurity carrier-gas transport drift and rediffusion in growth process was carried out.A technology for giving a reference to grown imputity profile of abrupt doping and uniform longitudinal direction based on the theory is presented.     

粗Na2WO4溶液的净化分离研究进展

对粗钨酸钠溶液中的几种常见而又典型的杂质，如砷、磷、硅、钼等的净化分离研究成果及几种常用的分离净化方法作了较详细的回顾，对本课题未来的研究方向进行了讨论。     

钽粉杂质含量对钽电容器性能的影响

根据国外两家钽粉生产厂提供的钽粉杂质含量资料，通过钽粉进厂复验和品质测试探索钽粉中的杂质含量对钽电容器的漏电流和击穿电压的影响。试验表明，五氧化二钽无定形介质膜的漏电流主要由杂质提供的载流子形成，钽电容器的击穿电压与杂质含量成反比关系。     

氟钽酸钾重溶方法的研究

对氟钽酸钾重溶进行了工艺条件、除杂效果等研究，并介绍了该方法在生产中的实际应用。     

空气透平压缩机齿轮裂纹原因分析

对空气透平压缩机齿轮裂纹进行了分析，结果表明，裂纹起源于齿根表面脆性氧化物夹杂处。由于该处应力较集中，加之材质强度偏低导致疲劳强度亦偏低，裂纹由此萌生并逐渐扩展成疲劳裂纹。     

海绵钛中杂质分布及其对产品质量的影响

论述了海绵钛产品的杂质分布及其对产品质量的影响，针对杂质分布的不均匀性，提出了生产中改善产品质量的措施，对产品进行处理，分部包装，以保证产品质量，提高合格率。