屏蔽泵在双氧水生产中的应用

通过多年生产实践，对双氧水生产用屏蔽泵常见故障进行了系统分析，并对屏蔽泵的安装、使用维护提出了整改措施及注意事项。     

Models for roughening of graphite during its catalyzed gasification

Models were developed to calculate porosities and total areas, and catalyzed to uncatalyzed gasification rate ratios as a function of burn-off for graphite flakes initially contaminated with channelling or pitting catalysts. The models indicate that small loadings of catalysts can increase the overall gasification rate by surface roughening without having a measurable effect due to interfacial catalysis.     

石墨／碳纤维／聚丙烯高强导热材料的研究

采用聚丙烯、石墨、碳纤维 (CF)制备出满足实际应用要求的高导热、高强度复合材料。实验结果表明 ,石墨和碳纤维在基体中的合理分布能显著提高复合材料的导热性能和力学性能。当聚丙烯和石墨的质量比为 5 0 /5 0时 ,添加 3 .3 3 %的碳纤维 ,其热导率为 2 .1W /(m·K) ,拉伸强度达到 5 1.49MPa。     

氟化炭材料性能研究进展

氟化是修饰和控制炭材料物理化学性质的有效方法之一，炭材料的多样性和宽范围的C-F键是氟化炭材料具有多种多样性质的基础。本文主要讨论了各种氟化炭材料的新性能，并简单介绍了氟化炭材料的制备方法及其表征方法。     

聚偏氟乙烯与导电填料复合材料的电性能研究

采用聚偏氟乙烯(PVDF)热塑性树脂与导电性填料Ti3SiC2或TiB2或石墨复合,通过高温模压的方法制备了导电复合材料,测量了导电性能,并借助扫描电镜表征了复合材料的微观结构,分析了影响导电复合材料导电性的因素.结果表明,PVDF/Ti3SiC2复合材料有望用于制备质子交换膜燃料电池的双极板.     

Electrochemical properties of nanosize Sn-coated graphite anodes in lithium-ion cells

A series of Sn-coated graphite composite materials for lithium-ion batteries were prepared by microencapsulating nanosize Sn particles in graphite. The nanosize Sn particles are homogeneously dispersed in the graphite matrix via electroless chemical reduction. The tin-graphite composite showed a great improvement in lithium storage capacity. Since Sn is an active element to lithium, Sn can react with lithium to form Li_4.4Sn alloys, a reaction accompanied by a dramatic volume increase, whereas the ductile graphite matrix provides a perfect buffer layer to absorb this volume expansion. Therefore, the integrity of the composite electrode is preserved during lithium insertion and extraction. Cyclic voltammetry was employed to identify the reaction process involved in lithium insertion and extraction in the graphite structure, as well as lithium alloying with tin. The tin-graphite composites provide a new type of anode material for lithium-ion batteries with an increased capacity.     

Effect of preparation conditions on the characteristics of exfoliated graphite

Exfoliated graphite (EG) was prepared from graphite intercalation compounds (GICs) synthesized electrochemically with different electricity consumption from 10.83 to 40.00 A h/kg. Effects of electricity consumption on the synthesis of GICs and of exfoliation temperature on different parameters of EG, i.e. exfoliation volume, volatile content, specific surface area and pore volume measured by mercury porosimetry, length and width of worm-like particles, and distance between neighboring balloons based on the zigzag model for worm-like particles of EG, were studied. These parameters were found to depend strongly on the electricity consumption and also on exfoliation temperature. Exfoliation volume, volatile content, specific surface area and pore volume on EG prepared at 1000 °C increased with increasing electricity consumption, but the distance between neighboring balloons was found to decrease. These results reveal marked development of pores in EG samples. Raising exfoliation temperature increased exfoliation volume, specific surface area and pore volume up to 800 °C. Above this temperature these parameters tended to be stable.     

聚四氟乙烯在碳石墨材料开发中的应用

简要介绍了聚四氟乙（简称ＰＴＦＥ）作为碳石墨材料的新型添加剂或浸渍剂对碳石墨材料性能的改善与提高，重点说明了ＰＴＦＥ在碳石墨材料制品开发中的应用状况及其展望。     

管壳式换热器中换热管与管板的活性连接技术

介绍了管壳式换热器中换热管与管板的一种活性连接技术.从预紧比压、填料层厚度,材料性能等方面对该技术进行分析,分别对软填函密封、O型圈密封、V型圈密封等结构进行了耐压实验研究.实验结果表明,预紧比压是决定密封效果的关键因素,填料层的厚度及填料的材料性能对其也有很大的影响.使用本技术的管壳式换热器具有耐压能力强,密封效果好等优点,可在实际生产中推广及应用.