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首页> 外文期刊>Journal of Applied Polymer Science >THE CORRELATION OF WEAR BEHAVIORS AND MICROSTRUCTURES OF GRAPHITE-PTFE COMPOSITES STUDIED BY POSITRON ANNIHILATION
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THE CORRELATION OF WEAR BEHAVIORS AND MICROSTRUCTURES OF GRAPHITE-PTFE COMPOSITES STUDIED BY POSITRON ANNIHILATION

机译：正电子AN散研究的石墨-PTFE复合材料的磨损行为与微观结构的相互关系

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摘要

The correlation between the wear behaviors of graphite-polytetrafluoroethylene (PTFE) composites and their macro- and microscopic structural changes was studied in a wide graphite volume content range of 0 to 50%. It was found that the macroscopic structure of graphite-PTFE composites changes from the state of PTFE-wrap-graphite to the state of detachment between PTFE and graphite powder along with an increase of graphite volume content. The sudden change occurred at the point of graphite volume content of about 40%. In this article the positron annihilation lifetime spectrum was used to detect the properties of microscopic imperfections. The results indicated that the changes of microimperfects of graphite-PTFE composites in size and in concentration are also related to the increase of graphite volume content while the crystallinity of PTFE shows a tendency to increase. The wear behaviors of graphite-PTFE composites corresponded to the physical properties of imperfects in a macro- and microscopic sense and were reflected fairly well by the interfacial properties between crystal and amorphous regions in PTFE. The positron annihilation technique is a useful tool for the study of tribological behaviors of polymers. (C) 1996 John Wiley & Sons, Inc. [References: 19]
机译：研究了石墨-聚四氟乙烯（PTFE）复合材料的磨损行为与其宏观和微观结构变化之间的相关性，该变化在0至50％的宽石墨含量范围内进行。研究发现，随着石墨体积含量的增加，石墨-PTFE复合材料的宏观结构从PTFE-包裹石墨的状态转变为PTFE与石墨粉之间的分离状态。突然的变化发生在大约40％的石墨体积含量。在本文中，正电子ron没寿命谱用于检测微观缺陷的性质。结果表明，石墨-PTFE复合材料的微观缺陷的变化也与石墨体积含量的增加有关，而PTFE的结晶度则呈现增加的趋势。石墨-PTFE复合材料的磨损行为在宏观和微观意义上与缺陷的物理性质相对应，并且在PTFE中晶体和非晶区域之间的界面性质反映得很好。正电子an灭技术是研究聚合物摩擦学行为的有用工具。 （C）1996 John Wiley＆Sons，Inc. [参考：19]

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