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亻若烟云银虫 (小有名气)
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[求助]
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| 聚甲醛（POM）是一种综合性能较优异的自润滑材料，是五大通用工程塑料之一。聚甲醛不但具备优异的机械性能和耐腐蚀性，而且其比刚度与比强度靠近金属材料。因为其独特的性能，已经被广泛应用于精密机械，汽车，机床，电子等领域代替有色金属。但聚甲醛的摩擦系数比较高，耐高温性能差，缺口敏感性高，冲击韧性低，由于这些缺陷导致聚甲醛在每个方面中应用受到了巨大的限定。聚四氟乙烯是一种摩擦系数小，化学稳定性好，具有优异的高温稳定性的填充材料。为了进一步提高工程塑料聚甲醛的摩擦磨损性能，添加摩擦系数较低的结晶性高分子材料聚四氟乙烯，从而扩展其应用领域。本研究对聚四氟乙烯经电子辐照系统辐照，机械粉碎，气流粉碎处理，得到粒度小于10微米的聚四氟乙烯微粉。通过辐照降低聚四氟乙烯的分子量，改善其和聚甲醛之间的相容性。 |
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亻若烟云: 金币+150, 翻译EPI+1, ★★★★★最佳答案 2016-05-19 13:59:51
亻若烟云: 回帖置顶 2016-05-19 17:51:43
亻若烟云: 金币+150, 翻译EPI+1, ★★★★★最佳答案 2016-05-19 13:59:51
亻若烟云: 回帖置顶 2016-05-19 17:51:43
| POM is a kind of self-lubrication material with the excellent comprehensive performance, which is one of five general engineering plastics. POM not only have the excellent mechanical properties and corrosion resistance,but also its specific stiffness and specific strength are closed to metal material. Due to the unique properties, POM has been widely used in the field of precision machinery, automobile, machine tools, electronics and so on instead of nonferrous metals. But because of some defects like relatively high friction coefficient, bad thermostable performance, high notch sensitivity, low impact toughness, application of POM in every aspect is limited greatly. PTFE is a kind of filling material with the low friction coefficient, good chemical resistance and excellent high temperature stability. In order to further improve the friction and wear properties of POM, adding a crystalline polymer material-PTFE with low friction coefficient can extend its application field. In this study, PTFE is irradiated by electron irradiation system, and treated with mechanical disintegration and fluid energy milling, and then PTFE micropowders can be got, whose particle size is less than 10 microns. Consistency between PTFE and POM can be improved by reducing the molecular weight of PTFE through irradiation. |
3楼2016-05-19 09:58:18
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2楼2016-05-18 21:53:51
