共查询到19条相似文献,搜索用时 125 毫秒
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采用碳粉/石墨、青铜粉、玻璃纤维(GF)、碳纤维(CF)、聚苯酯(POB)等改性材料改性聚四氟乙烯(PTFE),通过冷压、烧结的方式制得改性PTFE复合材料,研究了载荷、温度等环境条件对不同改性PTFE复合材料压缩蠕变的影响,通过退火进一步改善复合材料的抗蠕变性能,研究了退火温度对复合材料压缩蠕变及力学和摩擦磨损性能的影响。结果表明,各改性材料均能降低PTFE的压缩蠕变量,其中碳粉/石墨改性的PTFE复合材料压缩蠕变量最小,其次为青铜粉改性的复合材料,其余依次为GF,POB和CF改性的复合材料;改性PTFE复合材料的压缩蠕变量随着载荷和温度的增加明显增大,碳粉/石墨改性的PTFE复合材料蠕变受载荷增加的影响最小,且高温(150℃)下的压缩蠕变量最小。在150~300℃下对改性PTFE复合材料进行退火处理,可使其压缩蠕变量减少20%~40%,最佳的退火温度为300℃,在此温度下进行退火对复合材料力学和摩擦磨损性能影响不大。 相似文献
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改性聚四氟乙烯活塞环专用料研制 总被引:1,自引:0,他引:1
研究了青铜粉、玻璃纤维、二硫化钼复合填充改性聚四氟乙烯(PTFE)的力学性能和耐磨性能,结果表明,偶联剂表面处理的方式有效改善了青铜粉与PTFE的相容性;青铜粉、玻璃纤维和二硫化钼的三元协同改性提高了PTFE的耐磨性和硬度,稍微降低了其拉伸强度和断裂伸长率。最终得到了适用于制作中低压压缩机活塞环的改性PTFE的配方(质量含量,下同):青铜粉18%-20%、玻璃纤维10%-12%、二硫化钼5%、PTFE63%-67%。 相似文献
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填充 PTFE 是很好的耐磨材料。以玻璃纤维(GF)、碳纤维(CF)、石墨、二硫化钼、金属氧化物、青铜粉、PPS、聚酰亚胺等为填充剂的各种填充 PTFE 材料,导热性和硬度都比纯 PTFE高,耐磨性和 PV 值也有提高。因此广泛应用于超高层建筑和桥梁等支承、压缩机无油润滑活塞环及纺织、造纸,药品等机械的无油润滑、机床导轨等。 相似文献
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聚四氟乙烯(PTFE)由于具有优异的特性受到了广泛关注,但是其仍存在缺陷,需要通过对其进行改性,提升其复合材料的性能。研究表明,加入有机材料能显著改善PTFE的性能。概述了采用有机材料表面改性、填充改性和共混改性3种方法改性聚四氟乙烯(PTFE)复合材料的研究现状,即分别采用表面改性的钠-萘溶液方法、填充改性的聚苯酯(POB)、聚酰亚胺(PI)、聚苯烯腈(PAN)和聚酰胺(PA)以及共混改性的聚醚醚酮(PEEK)、聚苯硫醚(PPS)和聚甲醛(POM)改性PTFE的研究进展,重点解决了PTFE的高磨损问题,提升了复合材料的耐磨性能,并且分析了其增强机理。最后,对利用有机材料改性PTFE复合材料的研究进行了总结与展望。 相似文献
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聚四氟乙烯废料回收利用研究进展 总被引:2,自引:0,他引:2
介绍聚四氟乙烯(PTFE)废料回收利用的几种方法。其中机械法制得的再生PTFE粉可模压成型,也可作为填料或添加剂;辐射法制得的再生PTFE粉可与其它添加剂共混模压成型,或用作润滑剂和油墨等的添加剂、合成材料的改良剂等;热解PTFE可用于回收TFE、八氟环丁烷等工业原料或液体燃料,但需抑制有毒物质的产生。 相似文献
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研究改性石墨矸石粉补强天然橡胶(NR)的性能,并以煅烧温度、煅烧时间和偶联剂用量为3个因子通过正交试验来研究石墨矸石粉的最佳改性条件。结果表明:与炭黑补强胶料相比,石墨矸石粉补强胶料具有相似的硫化特性,焦烧时间略长。改性石墨矸石粉对NR具有明显的补强作用。SPSS软件分析的硫化胶物理性能结果显示,改性条件对补强性能影响主次顺序为偶联剂用量、煅烧温度和煅烧时间。正交试验分析确定石墨矸石粉的最佳改性条件为:煅烧温度800℃,煅烧时间1.5h,偶联剂用量(占石墨矸石粉质量的比例)2.2%。 相似文献
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考察了不同含量的纳米Al2O3对青铜粉/聚四氟乙烯(PTFE)摩擦磨损性能和物理机械性能的影响,采用扫描电镜(SEM)观察了复合材料的磨损表面,并分析和探讨了磨损机理。研究发现,纳米Al2O3和青铜粉复合填充可以大大提高PTFE复合材料的耐磨性,表现出良好的协同作用,但会降低复合材料的拉伸强度和断裂伸长率。添加5%纳米Al2O3后,40%青铜粉/PTFE复合材料的磨痕宽度从12.0 mm降低为5.0 mm,体积磨损率从171.40×10-6mm3/(N.m)降低为12.11×10-6 mm3/(N.m)。 相似文献
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玻璃纤维及石墨增强聚四氟乙烯复合材料摩擦磨损性能的研究 总被引:4,自引:0,他引:4
用机械混合、冷压成型和烧结的方法制备了不同质量分数(5%~30%)的玻纤和石墨填充聚四氟乙烯(PTFE)复合材料制品。用M-2000型磨损试验机评价了不同样品在干摩擦下的磨损性能,揭示了填料玻纤和石墨对PTFE复合材料磨损性能的影响,并对磨损机理进行了探讨。用扫描电镜(SEM)对试样磨损形貌进行观察。结果表明:对玻纤进行改性能极大地提高PTFE复合材料的耐磨性能,同时可提高复合材料硬度;玻纤和石墨协同作用,对改善PTFE摩擦磨损性能有比较显著的效果;20%玻纤 10%石墨填充PTFE复合材料有着较好的摩擦磨损性能。 相似文献
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聚四氟乙烯及其石墨填充复合材料的摩擦磨损特性 总被引:14,自引:0,他引:14
对聚四氟乙烯(PTFE)及石墨填充PTFE复合材料在不同载荷、不同润滑条件下,以及在不同对磨时间内的摩擦磨损性能进行了研究。结果表明,石墨填充PTFE的耐磨性比纯PTFE提高很多,不同的润滑条件对PTFE和石墨填充PTFE的磨损量及摩擦系数的影响不一样,对纯PTFE,其磨损量在水润条件下较小,而对石墨填充PTFE,其磨损量在油润滑条件下较小。 相似文献
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混杂填料增强聚四氟乙烯复合材料的摩擦学性能研究 总被引:1,自引:0,他引:1
采用MM-200型摩擦磨损试验机对纳米SiC、MoS2和石墨填充聚四氟乙烯(PTFE)复合材料在干摩擦条件下与45#钢对摩时的摩擦磨损性能进行了研究,探讨了MoS2、石墨及纳米SiC的协同效应。认为纳米SiC的加入大大提高了复合材料的承载能力,石墨、MoS2的加入减少PTFE复合材料的摩擦因数。利用扫描电子显微镜(SEM)对PTFE复合材料的摩擦面进行了观察。结果表明:实验中5%nano-SiC和3%MoS2填充PTFE复合材料的摩擦磨损性能最好,且在高载荷下的摩擦磨损性能尤为突出,具有一定的应用价值。 相似文献
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Wenjuan Xu Hong Gao Lilan Gao Jianhua Ma Xu Chen 《Polymer Engineering and Science》2014,54(7):1571-1578
A series of tensile and ratcheting experiments for cold compaction polytetrafluoroethylene (PTFE) and bronze filled PTFE (PTFE/bronze) were conducted with Dynamic Mechanical Analyzer (DMA‐Q800) at room and high temperature (473 K). The effects of peak stress‐holding time, creep, recovery, mean stress history, stress‐rate history, and pretension on the ratcheting behavior of PTFE/bronze were investigated. It is found that longer peak stress‐holding time leads to larger ratcheting strain accumulation. In the meantime, the ratcheting strain accumulates more rapidly at high temperature and the influence of temperature is more obvious than that of the additive fraction of bronze. Creep strain produced during the uploading and the stress‐holding time only partially recovers in the unloading process. Moreover, prior lower stress rate enhances the deformation resistance and restrains the ratcheting of subsequent cycling at higher stress rate. The ratcheting strain in the subsequent cyclic loading at lower mean stress is also restrained by previous cyclic loading at higher mean stress. Finally, the elastic modulus increases and the ratcheting strain is restrained apparently after the pretension. In addition, the elastic modulus and ratcheting strain of the PTFE/bronze with both pretension and recovery are smaller than those with pretension but without recovery. POLYM. ENG. SCI., 54:1571–1578, 2014. © 2013 Society of Plastics Engineers 相似文献
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Research on the tribological performance of Cr2O3 filled with bronze‐based PTFE composites
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Enhancement of the wear resistance of bronze‐filled polytetrafluoroethylene (PTFE) composites has been achieved using various fillers, for example, chromic oxide (Cr2O3), molybdenum disulfide (MoS2), graphite, and nanometer aluminum oxide (n‐Al2O3), in the present study. The wear resistance was evaluated by a block‐on‐ring wear tester, and the effects of fillers on the wear resistance as well as the mechanism were investigated. The wear rate for the composite where the recipe containing 59% PTFE + 40% bronze + 1% Cr2O3 was 0.5 × 10?5 mm?3/N m and for the composite in the recipe containing 60% PTFE + 40% bronze was 4.2 × 10?5 mm?3/N m, which meant that that Cr2O3 increased the wear resistance by approximately 10 times. The differential scanning calorimetry measure analysis showed that Cr2O3 had a positive effect on the crystallization of PTFE; the crystallinity of PTFE composites increased from 45% to 52%, which exhibited improved wear resistance. Wear testing and scanning electron microscope analysis had shown that Cr2O3 had a positive effect on the formation of transfer film and keeping it stable to exhibit improved wear resistance. X‐ray photoelectron spectroscopy results also showed that Cr2O3 was effective in tribochemical reactions during sliding against stainless ring; these maybe responsible for forming transfer film and lowering wear rate of composite. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41117. 相似文献