纳米Al_2O_3填充超高分子量聚乙烯的生物摩擦磨损性能研究

用纳米Al2O3对人工关节软骨UHMWPE进行填充改性,在生理盐水润滑条件下,评价了其摩擦磨损性能。结果表明,纳米Al2O3的加入,在一定程度上提高了UHMWPE的硬度,与钛合金对磨时的摩擦系数随Al2O3含量(<10%)的增加而增加;与不锈钢对磨时,摩擦系数有所增加;不同Al2O3含量(<10%)的UHMWPE,磨损率比纯UHMWPE低。纯UHMWPE的磨损表现为明显的犁沟以及塑性变形,加入纳米Al2O3的UHMWPE的磨损主要表现为磨粒磨损和轻微的塑性变形。     

POM/UHMWPE共混物摩擦磨损性能研究

将3种不同的超高摩尔质量聚乙烯(UHMWPE)和聚甲醛(POM)共混，制成POM自润滑材料，并研究了共混物的摩擦磨损性能。结果表明：采用自制的PP改性UHMWPE(M-UHMWPE)与POM共混，能有效提高POM的摩擦磨损性能；当M．UHMWPE质量分数为5％时，POM／M-UHMWPE共混物的摩擦系数从纯POM的0．32降低到共混物的0．16，磨痕宽度从POM的5．00mm下降为3．56mm；SEM分析表明，在摩擦过程中，M-UHMWPE向磨损界面转移形成磨屑，有效地隔离了两摩擦面的接触，起到了减摩耐磨剂的作用，明显降低了POM树脂的摩擦系数，提高了POM的耐磨损性能。     

UHMWPE/PP-X/PP共混物滑动摩擦性能研究

采用自制的交联聚丙烯（PP-X）与超高分子量聚乙烯（UHMWPE）、聚丙烯（PP）共混,对共混物的力学性能和滑动摩擦性能进行了研究。结果表明,在力学性能改变不大的情况下,当UHMWPE／HL-X／PP的质量比为80／20／10时,共混物的磨痕宽度为5．69mm,摩擦系数为0．125,比纯UHMWPE的磨痕宽度、摩擦系数分别下降了21．73％和39．90％,比UHMWPE）／PP（100／10）共混物分别下降了2．0％和18．83％。扫描电子显微镜照片显示,在UHMWPE的磨损表面存在严重的刮痕、裂纹及磨屑,而在UHMWPE,PP-X／PP共混物的磨损表面却很少发现上述现象。     

纳米TiO2-超高分子量聚乙烯复合材料的摩擦学特性

利用MM-200型摩擦磨损实验机,考察了纳米TiO2增强超高分子量聚乙烯（UHMWPE）复合材料在生理盐水润滑下,与Co—Cr—Mo合金对摩时的摩擦磨损性能,用光学显微镜观察了材料摩擦表面磨痕形貌。结果表明,适当填充纳米TiO2可提高UHMWPE的硬度,显著降低摩擦系数,增强耐磨性。UHMWPE的磨损主要表现为粘着、犁沟及塑性变形,TiO2-UHMWPE复合材料的磨损表现为轻微疲劳磨损。     

混杂填充UHMWPE复合材料的摩擦与磨损性能

制备了多相混杂填充超高相对分子质量聚乙烯（UHMWPE）复合材料，研究其摩擦、磨损性能。结果表明，填料的加入可以缩短磨合期，延长稳定磨损期。多相混杂复合材料具有较低的摩擦因数，较好的耐磨性能。含质量分数为70％UHMWPE、质量分数为5％CF（碳纤维）、质量分数为10％PHBA（聚苯酯）、质量分数为15％PTW（六钛酸钾晶顺）的复合材料具有最好的性能，其摩擦因数低、磨痕宽度小、受摩擦速度和载荷的影响也比较小。磨损表面扫描电镜照片显示，纯UHMWPE表面较为粗糙，呈现粘着磨损和疲劳磨损特征，混杂填料试样表面光滑，不存在疲劳磨损特征。     

载荷、速度及环境温度对聚醚砜酮摩擦磨损性能的影响

利用MM—2000型和THT07—135型摩擦磨损试验机系统考察了载荷、滑动速度和环境温度对含二氮杂萘联苯型聚醚砜酮(PPESUK)摩擦磨损性能的影响，并利用扫描电子显微镜(SEM)观察分析了其磨损表面形貌及磨损机理。研究表明，干摩擦条件下，随载荷增加PPESUK的摩擦系数降低、磨损率增加；在高的滑动速度下，摩擦系数和磨损率都降低；环境温度对PPESUK的摩擦系数影响不大，并且粘着磨损是其主要磨损机理。     

碳纤维增强PEEK复合材料的摩擦学性能研究

用磨损试验机对碳纤维增强聚醚醚酮（PEEK）复合材料进行室温干滑动磨损试验。考察了碳纤维的含量，石墨润滑剂，对靡时间及载荷对材料靡损量及摩擦系数的影响，并用电子显微镜对其磨损表面进行了观察与分析，同时对材料的磨损机理进行了探讨，研究结果表明，随着载荷的升高和对磨时间的延长，材料的摩擦系数逐渐降低并趋于稳定，磨损量呈上升趋势，加入碳纤维可以明显地降低材料的摩擦系数和磨损量，当碳纤维含量为5％－10％时复合材料的摩擦系数和磨损量最低；加入适量固体石墨可进一步降低复合材料的摩擦系数和磨损量。     

不同摩擦环境下GO/UHMWPE复合材料摩擦学行为研究

为推动超高分子量聚乙烯(UHMWPE)在医学材料领域的应用,通过模压成型法制备氧化石墨烯(GO)/UHMWPE复合材料,并在干摩擦环境、去离子水及小牛血清中研究复合材料摩擦学行为。结果表明,随着GO的添加,复合材料的硬度明显增加。复合材料的摩擦系数在干摩擦过程中最大,去离子水过程中次之,小牛血清中最小。此外,同样条件下,GO/UHMWPE复合材料摩擦系数均比纯UHM WPE的大。三种条件下,磨损率与摩擦系数呈现相同的趋势,但是同样条件下,GO/UHMWPE复合材料磨损率明显小于纯UHM WPE。最后结合磨痕表面微观形貌,揭示不同摩擦环境下材料的磨损机制。     

碳材料摩擦性能浅谈

在转速和压力变化情况下,碳石墨材料与对磨件进行摩擦磨损试验,研究在不同转速和不同压力下,碳材料的摩擦系数、磨损值及表面状况,并通过试验了解碳材料摩擦磨损情况。结果试验表明:在一定载荷条件下,随着转速的增加,碳材料摩擦磨损性能因转速小先保持良好,但当随着转速增加,因摩擦过程产生热,使摩擦磨损性能变差,造成摩擦磨损趋于恶化。在一定转速条件下,随着载荷的增加,碳材料摩擦系数性能因载荷小先保持良好,但当随着载荷增加摩擦性能因润滑油不能进行入相接触界面,使碳石墨与对磨件形成干摩擦,造成磨损趋于恶化。     

钛酸钾晶须填充UHMWPE复合材料的摩擦磨损性能研究

用钛酸钾晶须（PTW）对超高摩尔质量聚乙烯（UHMWPE）进行填充改性，考察了复合材料的摩擦磨损性能，研究了其结晶情况，观察了磨损表面形貌并分析了其机理。结果表明：随着PTW用量的增加，复合材料的硬度、结晶度以及维卡软化点都有所增大。PTW提高了复合材料的耐磨性，但摩擦系数有所上升。PTW的加入使得UHMWPE的磨损机理从黏着磨损和塑性变形改变成疲劳磨损和轻微的塑性变形，提高了其抗磨粒磨损的性能。     

Fabrication of Polyimide-Modified UHMWPE Composites and Enhancement Effect on Tribological Properties

Polyimide-modified ultrahigh molecular weight polyethylene (UHMWPE) composites were fabricated by hot-press molding process. Mesoscopic morphologies of polyimide/UHMWPE blending systems show high compatibility between the phases of polyimide and UHMWPE when the weight ratio of polyimide is no more than 50?wt%. Investigation of the tribological properties with a reciprocating ball-on-flat contact tribometer shows that the polyimide filler has important effects on the friction and wear behavior of UHMWPE composites. Compared to pure UHMWPE, the composite with 50?wt% polyimide improved tribological properties best and exhibited 43.1% reduction in friction coefficient and 66.7% reduction in wear volume loss.     

超高分子量聚乙烯的滑动摩擦磨损研究

本文在塑料滑动摩擦磨损试验方法的基础上,研究超高分子量聚乙烯（UHMWPE）与砂纸进行滑动摩擦磨损的过程,为快速、合理的评价UHMWPE板材料、管材料的耐磨性能提供方法。实验过程中,随着摩擦距离改变,UHMWPE的磨损量与磨痕宽度变化明显,而且磨损表面表现出不同的摩擦学特征。另外,摩擦过程生热严重,容易发生氧化反应。通过磨粒磨损、粘着磨损、疲劳磨损等机理对UHMWPE摩擦磨损过程进行了说明。     

Tribological,Mechanical Properties,and Morphology of Polyphenylene Oxide/Ultrahigh Molecular Weight Polyethylene Blends

Ultrahigh molecular weight polyethylene-g-polystyrene was synthesized as a compatibilizer through a suspension-grafting copolymerization method. Various weight ratios of polyphenylene oxide/ultrahigh molecular weight polyethylene-g-polystyrene/ultrahigh molecular weight polyethylene blends were prepared by extruding, and mechanical properties, morphology as well as tribological behavior were investigated. Tensile strength, flexural strength, and Rockwell hardness increased with the increasing of the compatibilizer. Impact strength and antiwear properties of the blends were improved significantly by contrast to those of pure polyphenylene oxide. The polyphenylene oxide/ultrahigh molecular weight polyethylene-g-polystyrene/ultrahigh molecular weight polyethylene blend of 90/10/0 compared with other ratios as an optimum ratio. In this case, the wear volume and friction coefficient of the blend were 2.6% of PPO and 45% lower than PPO, respectively.     

Effect of solid lubricants on tribological behavior of glass fiber reinforced polyamide 6

The tribological properties of glass fiber reinforced polyamide 6 (GF/PA6, 15/85 by weight) and its composites filled with solid lubricants were investigated. The main purposes of this article were to study the hybrid effect of solid lubricants with glass fiber as well as the synergism of combined solid lubricants, the wear mechanisms were studied by SEM. The results showed that graphite impaired the tribological properties of GF/PA6, but the tribology behavior of graphite filled GF/PA6 composite could be significantly improved by polytetrafluroethylene (PTFE) or/and ultrahigh molecular weight polyethylene (UHMWPE), and the GF/PA6 composite filled with 5 wt % graphite, 5 wt % PTFE together with 5 wt % UHMWPE exhibited the lowest friction coefficient and wear rate, which was almost a reduction in friction coefficient by 37% and in wear rate by 34% contrast to GF/PA6. The effect of load was also studied, and the results showed that the friction coefficient was virtually not affected by load, while the wear rate all increased with increasing load. POLYM. COMPOS., 34:1783–1793, 2013. © 2013 Society of Plastics Engineers     

Al2O3/PTFE复合材料的磨损性能研究

用机械共混、冷压成型烧结的方法制备了Al2O3／PTFE复合材料试样。用MM-200型磨损试验机测试了在干摩擦定载荷条件下各试样的磨损性能；用扫描电子显微镜(SEM)对磨损试样的表面形貌和磨屑的形貌进行了观察和分析；用光学显微镜对磨损后偶件环的表面形貌作了观察分析。结果表明：在实验条件下，Al2O3／PTFE复合材料的抗磨损性能，随Al2O3用量的增大逐渐增强，当Al2O3用量大于35％后，抗磨损性能增强的趋势明显减缓；在干摩擦条件下Al2O3／PTFE复合材料主要发生粘着磨损和磨粒磨损，且随Al2O3用量的增加，磨粒磨损所起的作用也增大。     

A study on sliding wear of ultrahigh molecular weight polyethylene/polypropylene blends

The wear and friction behavior of ultrahigh molecular weight polyethylene (UHMWPE)/ polypropylene (PP) blends was studied. The addition of PP improves processability and the anti‐wear properties of UHMWPE. The friction coefficient and wear rate of pure UHMWPE are much higher than those of UHMWPE/PP blends under the same conditions, and the wear rate of UHMWPE is more sensitive to load and wear time than that of the UHMWPE/PP blend. Long scratch grooves and cracks occurred in the worn surface of UHMWPE, while no such serious damage was observed in the worn surface of the UHMWPE/PP blend. Atomic Force Micrograph using the contact mode indicated that the friction force between pure UHMWPE and Si₃N₄ tip is much higher than that for the UHMWPE/PP blend, which is consistent with the results from macro‐friction testing.     

PTFE/BaSO4复合材料摩擦磨损性能研究

用M-2000型摩擦磨损试验机研究了干摩擦条件下BaSO4用量，载荷，对磨时间对聚四氟乙烯（PTFE）复合材料摩擦磨损性能的影响。在本实验条件下，PTFE/BaSO4复合材料的摩擦系灵敏随着BaSO4含量的增加而增大，抗磨损能力则有一个最佳含量；随着载荷的增加，材料的摩擦系数，磨损量和磨痕宽度也随之增大，磨损量随着对磨时间的延长而波动变小并趋于稳定。     

N-油酰基谷氨酸的合成及其在菜籽油中的摩擦学性能研究

将油酸酰氯与谷氨酸在碱性溶液中反应制得N-油酰基谷氨酸,用IR对其结构进行了表征;利用四球磨损试验机考察了植物菜籽油中加入N-油酰基谷氨酸的摩擦学性能,通过测定不同添加含量、不同条件下的最大无卡咬负荷(PB)、烧结负荷(PD)、磨斑直径(WSD)和摩擦系数(μ),分析和研究了载荷、添加剂含量对菜籽油摩擦学性能的影响.试验结果表明,N-油酰基谷氨酸可以显著提高菜籽油的承载能力和抗磨性能,且具有良好的防锈性.     

高强度聚乙烯纤维绳索的制备研究

研究了纤维的捻度及浸胶处理对超高相对分子质量聚乙烯 (UHMWPE)纤维力学性能及摩擦磨损性能的影响。结果表明 ,UHMWPE纤维的断裂强力随着纤维捻度的增加而减小 ,纤维浸胶处理后的断裂强力增大 ;当UHMWPE纤维中改性氯丁胶粘剂或聚氨酯胶粘剂的含量为 6%时 ,其断裂强力分别增加 17.2 %或 13 .9% ,聚氨酯胶粘剂处理过的UHMWPE纤维的耐摩擦磨损性能最好。     

聚苯硫醚复合材料摩擦性能的研究

考察了聚四氟乙烯（PTFE）、纳米无机粒子及不同含量和粒度的石墨填充改性聚苯硫醚（PPS）复合材料的摩擦磨损性能、力学性能；并采用扫描电镜（SEM）观测了磨损表面及对摩面的微观结构。结果表明：石墨的添加有利于在对摩面上形成转移物，而且随着石墨含量的增加，材料的摩擦系数明显降低，但磨耗量却有所升高，而石墨的粒度变化对材料的摩擦性能没有太大的影响；当PTFE和石墨两种固体润滑剂同时加入时，材料的力学强度有所降低，但其摩擦系数及磨耗量都得到明显改善，材料以疲劳磨损为主：纳米无机粒子的加入会使材料的磨耗量有所增大，其磨损机理转变为磨粒磨损。