表面活性剂辅助水热法中TiO2的形状控制

By hydrolysing titanium isopropoxide in a long hydrocarbon chain surfactant-containing solution, TiO2 fine particles with a diversity of well-defined morphologies was synthesized in this study by a hydrothermal route. The structural change during the formation process was monitored by scanning electron microscopy, transmission electron microscopy and X-ray diffraction analysis. TiO2 with various morphologies such as particle, sheet, rod, tube and flower-like shape was obtained by carefully controlling the preparation conditions. The experimental results show that the pH value is crucial for shape control of the produced TiO2 because it can change the charge state of the surfactant in the solution and the adsorption potential of the surfactant on the TiO2 surface. The shape evolvement of anatase TiO2 was elucidated by quenching the reaction at different stage and the formation mechanism of different shaped TiO2 was suggested.     

TaC、Cr_3C_2对WC-Co硬质合金组织和性能的影响

研究了添加：TaC、Cr3C2对WC－10Co合金组织结构和性能影响，讨论了相关机理。结果表明，少量添加TaC（2－m％）、Cr3C2（0．44m％）可导致WC－10Co合金的WC晶粒明显细化’WC邻接度下降，γ相平均自由程减小，但强韧性有所下降；Cr3C2助长WC－10Co合金WC晶粒断续长大；TaC－WC固溶体耐碱蚀性差；合金断口中沿WC—WC品界脆断比例增加，TaC－WC固溶体晶粒倾向于穿晶劈裂。工艺中控制TaC、Cr3C2添加量、确保WC～Cr3C2粉碳化完善以及同时添加TaC、Cr3C2对确保合金材质至关重要。     

内壁多凸起式大型燃煤加热炉的使用效果与改进

介绍了内壁多凸起式大型燃煤加热炉的特点、使用效果及改进措施。     

国产碘化钾添加剂用于尼龙66连续缩聚的生产实践

介绍了国产碘化钾添加剂在尼龙66连续缩聚反应中的应用。试验结果表明:与进口同类碘化钾添加剂相比,使用国产碘化钾添加剂,尼龙66的聚合工艺正常,生产稳定,工业丝和浸胶布各项物性指标均达到优等品要求,同时降低了生产成本。     

煤炭企业职工素质提升思考与对策

分析了市场经济条件下职工素质与企业发展的关系,阐述了提高煤炭企业职工素质的紧迫性,通过对企业职工素质存在问题的分析,结合企业特点,提出了提高煤炭企业职工素质的途径和方法.