UHMWPE/纳米Al_2O_3复合材料在不同温度下的摩擦磨损性能研究

利用QG-700高温气氛摩擦磨损实验机研究了纯超高摩尔质量聚乙烯(UHMWPE)和质量分数为5%的纳米Al2O3/UHMWPE复合材料在不同温度下的摩擦磨损性能;并利用扫描电子显微镜观察了磨损表面形貌。结果表明:在实验温度条件下,5%纳米Al2O3/UHMWPE复合材料的耐磨性好于纯UHMWPE。纯UHMWPE的磨损机制主要是黏着磨损和疲劳磨损,而5%纳米Al2O3/UHMWPE复合材料的磨损机制转变为黏着磨损和磨粒磨损。     

纳米氧化铝改性聚四氟乙烯的摩擦磨损性能研究

以纳米Al2O3作为填料填充改性聚四氟乙烯(PTFE),采用模压烧结成型的方法制备了不同纳米Al2O3含量的PTFE/纳米Al2O3复合材料,考察了偶联剂改性前后纳米Al2O3及其含量对复合材料硬度、摩擦系数和磨痕宽度的影响,并利用扫描电子显微镜对复合材料的磨屑和磨损表面进行了微观分析。结果表明,随着纳米Al2O3含量的增加,复合材料的硬度和摩擦系数逐渐增大,磨痕宽度先大幅下降而后略有增加。另外,相对于未改性纳米Al2O3,PTFE/偶联剂改性纳米Al2O3复合材料的硬度和摩擦系数均较低,其磨痕宽度则较高。     

电梯工况下纳米Al2O3对PA6耐磨损性能的影响

以聚酰胺6(PA6)为电梯靴衬材料,制备了PA6/纳米Al2O3复合材料。在电梯工况下研究纳米Al2O3含量对复合材料磨损性能的影响,并探讨纳米Al2O3对PA6的作用机理。结果表明,在电梯工况下随着试验时间的延长,PA6/纳米Al2O3复合材料摩擦因数经历了先急剧增大后迅速减小再平缓的变化过程;随着纳米Al2O3含量的增加,复合材料的摩擦因数和磨损量表现为先减小后增加的变化;当纳米Al2O3含量为4%时,其减摩耐磨效果最为显著,对应的摩擦因数和磨损量分别比纯PA6降低23.5%和84.3%;复合材料的磨损行为与纳米Al2O3含量有关,纯PA6磨损形式主要是磨粒磨损和黏着磨损并存,随着纳米Al2O3含量的增加,复合材料经历了磨粒磨损先增强后减弱和黏着磨损先减弱后增强的变化过程。     

尼龙6/纳米A12O3复合材料与铜摩擦副的摩擦磨损性能

采用双螺杆挤出机共混制备尼龙6／纳米Al2O3复合材料,考察了复合材料的硬度及与铜摩擦副的摩擦磨损性能。试验表明,加入纳米Al2O3可使尼龙6的硬度提高。在低载荷时,复合材料的摩擦系数随载荷的增加而减小;当载荷超过一定值后,摩擦系数增大;载荷一定时,摩擦系数随纳米A120,含量的增加呈上升趋势。当纳米Al2O3含量达到10份时,复合材料的磨损量较小;当纳米Al2O3超过10份时,纳米Al2O3粒子的团聚会造成其与基体尼龙6的结合力降低,最终导致尼龙6／纳米Al2O3复合材料磨损量增大。     

PTFE/Al2O3纳米复合材料的摩擦磨损性能研究

利用MM—200型摩擦磨损试验机研究了PTFE／Al2O3纳米复合材料的摩擦磨损性能，并采用扫描电子显微镜观察、分析了试样磨屑形状及磨损机理。结果表明，经表面处理的纳米Al2O3能明显提高PTFE的耐磨损性并改变其磨屑形成机理；当表面处理纳米Al2O3含量为3％时，PTFE纳米复合材料的磨损量最小，但在试验范围内，表面处理纳米Al2O3含量变化对PTFE纳米复合材料的耐磨损性影响不大，而PTFE纳米复合材料的摩擦系数则随表面处理纳米Al2O3含量增加而略有增大，导致PTFE磨损的机理主要是粘着磨损。     

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。     

PA6/纳米Al_2O_3复合材料摩擦性能的研究

研究了纳米Al2 O3 填充PA6复合材料的摩擦性能。通过分析纳米Al2 O3 含量、载荷对材料摩擦系数和耐磨性能的影响,得到复合材料中纳米Al2 O3 为 6wt%时,材料的摩擦性能最好。通过SEM图片分析试件摩擦表面形貌,发现复合材料的磨损机理从纯PA6材料的粘着磨损转为轻微的磨粒磨损和粘着磨损     

PA6／纳米A12O3复合材料摩擦性能的研究

研究了纳米Al2O3填充PA6复合材料的摩擦性能。通过分析纳米Al2O3含量、载荷对材料摩擦系数和耐磨性能的影响，得到复合材料中纳米Al2O3为6wt％时，材料的摩擦性能最好。通过SEM图片分析试件摩擦表面形貌，发现复合材料的磨损机理从纯PA6材料的粘着磨损转为轻微的磨粒磨损和粘着磨损。     

纳米Al2O3颗粒填充聚酰胺6的摩擦性能研究

通过原位聚合制备了纳米Al2O3增强单体浇铸聚酰胺复合材料(简称PA6／Al2O3)。在磨损试验机上考察了纳米粒子含量和试验条件对其摩擦性能的影响，并利用扫描电子显微镜对其摩擦性能和磨损机制进行了考察。分析结果表明：纳米Al2O3填料可提高单体浇铸PA6的耐磨性，其含量在3％左右时增强效果最好；随着载荷的增加，PA6／Al2O3的磨损率平缓增大，而摩擦系数逐渐减小，其摩擦系数值较单体浇铸PA6的摩擦系数稍大。     

纳米CuO填充UHMWPE基复合材料摩擦学性能的研究

利用MM 200型摩擦磨损试验机研究了不同质量含量的纳米CuO填充UHMWPE基复合材料在干摩擦条件下与45#钢对磨时的摩擦学性能。并利用扫描电子显微镜(SEM)观察分析磨损表面形貌及磨损机理。结果表明,纳米CuO/UHMWPE复合材料的摩擦性能与纯UHMWPE相比大部分均有提高,但耐磨性明显优于后者,纳米CuO在复合材料中的最佳含量在15%～17%左右。     

The Friction and Wear of Aramid Fiber-Reinforced Polyamide 6 Composites Filled with Nano-MoS2

The friction and wear behaviors of aramid-filled PA 6 composites filled with and without nano-MoS₂ were investigated on an end-face tribometer through rubbing against ASTM 1045 steel under dry friction. The experimental results indicated that the wear rate and the friction coefficient of PA 6 decreased with the addition of nano-MoS₂. The friction coefficients of PA 6 composites filled with aramid fiber are lower than those without nano-MoS₂. The main wear mechanisms under dry sliding condition are the plastic deformation and mechanical microploughing. For best combination of friction coefficient and wear rate, the optimal volume content of MoS₂ in the composites appears to be 10 vol %.     

超细γ-Al_2O_3对酚醛树脂基摩擦材料摩擦磨损性能的影响

采用热压成型法制备了超细γ-Al2O3粉体改性酚醛树脂基摩擦材料,在定速摩擦磨损试验机上考察了不同含量γ-Al2O3对材料摩擦磨损性能的影响,通过扫描电子显微镜(SEM)观察材料磨损后的表面形貌并分析其磨损机理。结果表明,随着γ-Al2O3含量的增加,材料的摩擦系数明显增加,抗热衰退性能得到显著改善,磨损率稍有提高。SEM分析表明,添加γ-Al2O3后,磨损机理由粘着磨损转变为粘着磨损与磨粒磨损的复合形式。     

Tribo-material based on a UHMWPE/RGOC biocomposite for using in artificial joints

Reduced graphene oxide (RGOC) filler that was green synthesized by vitamin C had been included in the ultrahigh molecular weight polyethylene (UHMWPE) matrix to produce biocomposite possessing improved properties especially against wear. The biocomposites filled with different loading (0.1, 0.3, 1.0, and 2.0 wt%) of RGOC was produced by a method of liquid phase ultrasonic mixing and then hot press molding. The structural analysis results of biocomposites showed that RGOC well-dispersed in polymer matrix and confirmed that there was interaction between the RGOC-UHMWPE. The biocomposite containing 2.0 wt% RGOC (UHMWPE/RGOC-2) gave the maximum microhardness and the value increased by 22. 5% compared with unfilled polymer. At the same RGOC content, the biocomposite had the highest thermal stability with residue content at 2.42%. The wear and friction behavior of biocomposites were carried out in a reciprocating friction testing machine under distilled water lubricating conditions. The UHMWPE/RGOC-2 biocomposite had the lowest friction coefficient value (0.034) and the wear rate of the biocomposite decreased by 44%, compared with that of unfilled UHMWPE. Furthermore, fatigue wear tracks were significantly reduced. This study suggests the use of this composite that had excellent tribological behavior as biomaterial instead of UHMWPE.     

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     

分子量对UHMWPE干摩擦条件下的销-盘摩擦磨损行为的影响

采用销-盘试验,在转速为60 r/min,法向为载荷(392±29)N,聚合物盘与钢销摩擦副接触形式为面-面,试验时间为1.5 h,试验环境温度为20℃,相对湿度为60%的条件下,研究了200万、300万、500万和900万分子量的UHMWPE分别与钢配副干摩擦时UHMWPE分子量对其摩擦磨损性能的影响,并利用扫描电子显微镜观察其磨损表面形貌。结果表明:UHMWPE分子量其摩擦磨损性能有显著影响,UHMWPE的分子量为300万时,摩擦副的摩擦因数及UHMWPE自身的磨损为最小。     

Improvement of the tribological behavior of ultra‐high‐molecular‐weight polyethylene by incorporation of poly (phenyl p‐hydroxyzoate)

Ultra‐high‐molecular‐weight polyethylene/poly (phenyl p‐hydroxyzoate) composites (coded as UHMWPE/PPHZ) were prepared by compression molding. The effects of the poly (phenyl p‐hydroxyzoate) on the tribological properties of the UHMWPE/PPHZ composites were investigated, based on the evaluations of the tribological properties of the composites with various compositions and the examinations of the worn steel surfaces and composites structures by means of scanning electron microscopy and transmission electron microscopy. It was found that the incorporation of the PPHZ led to a significant decrease in the wear rate of the composites. The composites with the volume fraction of the PPHZ particulates within 45% ～ 75% showed the best wear resistance. The friction coefficient of the UHMWPE/PPHZ composites decreased with increasing load and sliding velocity, while the wear rates increased with increasing load. This was attributed to the enhanced softening and plastic deformation of the composites at elevated load or sliding velocity. The UHMWPE/PPHZ composites of different compositions had differences in the microstructures and the transfer film characteristics on the counterpart steel surface as well. This accounted for their different friction and wear behaviors. The transfer film of the UHMWPE/PPHZ composites appeared to be thinner and more coherent, which was largely responsible for their better wear resistance of t composite than the UHMWPE matrix. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 2336–2343, 2005     

Study on the Friction and Wear Behaviors of Modified PA66 Composites

The wear-resistant polyamide 66 (PA66) composites were prepared and the mechanical properties, friction and wear properties were inspected. Results show that GF, PTFE and MoS₂ can improve the mechanical, friction and wear properties of PA66 composites. PTFE is more effective on the friction and wear properties than MoS₂ when GF is 30%wt. The best effect of the modification is 35%wt GF when both PTFE and MoS₂ were added. Friction coefficient first increase, then reduce to be stable as sliding time increases. Friction coefficient and wear mass loss increase as load increases. The main wear mechanisms are fatigue and abrasion wears.