干摩擦及水润滑下氧化锆-氧化铝层状复合陶瓷的摩擦学行为

研究了氧化锆氧化铝三层结构层状复合陶瓷在干摩擦和水润滑下的摩擦学性能和磨损机制，并比较了氧化锆-氧化铝单层陶瓷在相同条件下的摩擦学性能。结果表明：相同条件下，层状陶瓷的摩擦系数和磨损率均低于单层陶瓷，根本原因在于层状陶瓷表面的压应力导致的韧性提高和磨损表面剪切应力的降低。水润滑可以有效地降低复合陶瓷的摩擦磨损，主要原因是由于水引起主导磨损机制发生变化，由干摩擦时的磨粒磨损和粘着磨损转变为摩擦化学磨损和疲劳磨损。     

水润滑下纳米三氧化二铝/端异氰酸酯基聚丁二烯液体橡胶-环氧树脂复合材料的摩擦性能

研究了纳米Al2O3/端异氰酸酯基聚丁二烯液体橡胶-环氧树脂(ETPB)复合材料在水润滑条件下的摩擦性能,并用扫描电子显微镜表征了复合材料的磨损表面形貌,探讨了磨损机理。结果表明,在水润滑条件下,纳米Al2O3/ETPB复合材料的磨损率和摩擦系数低于ETPB;载荷和滑动速率的变化对纳米Al2O3/ETPB复合材料的磨损率、摩擦系数及磨损表面形貌影响不大,复合材料的磨损表面均未产生裂纹;ETPB的磨损机理为疲劳磨损,纳米AlO/ETPB复合材料的磨损机理为机械抛光磨损。     

不同介质中聚四氟乙烯复合材料的摩擦磨损性能

分别在碱液、水、油和干摩擦条件下考察了碳纤维和玻璃纤维填充聚四氟乙烯复合材料的摩擦磨损性能。利用SEM观察了不同介质中磨损面和对摩面的形貌,并探讨了其磨损机理。结果表明,不同介质中摩擦系数的大小关系是μ干>μ水或油>μ碱,磨损率是W水>W干>W碱或油。水、碱和油都不同程度地阻止了转移膜的形成。碱液和油具有很好的冷却与润滑作用,摩擦系数低,磨损小;然而水分子降低了填料和基体的界面粘接强度,造成犁削和磨粒磨损加重。     

环氧树脂基复合涂层摩擦磨损性能研究

研究了不同质量分数石墨、碳纤维、纳米ZrO2对环氧树脂(EP)涂层摩擦磨损性能的影响,并用扫描电子显微镜观察了涂层磨损表面形貌并探讨了磨损机理。结果表明:石墨质量分数为20%时复合涂层的磨损率仅为纯EP的7.75%;纳米ZrO2质量分数为4%时复合涂层的磨损率为纯EP的30%;纳米ZrO2与碳纤维以及石墨的协同作用提高了EP的摩擦磨损性能。EP复合涂层的磨损机理以粘着磨损、磨粒磨损以及疲劳磨损为主。     

润滑条件对PTFE复合材料摩擦学性能的影响

对3种聚四氟乙烯复合材料与45#钢和表面阳极氧化铝合金配副进行了摩擦性能测试,测定了不同润滑条件下聚四氟乙烯复合材料的摩擦学性能。用扫描电子显微镜观察了聚四氟乙烯复合材料与表面阳极氧化铝合金摩擦磨损后的表面形貌。结果表明:在油润滑条件下,聚四氟乙烯复合材料摩擦因数和磨痕宽度最小,在干摩擦条件下,聚四氟乙烯复合材料摩擦因数最大;在水润滑条件下,聚四氟乙烯复合材料磨痕宽度最大;在油润滑条件下,摩擦表面可形成均匀连续的转移膜和润滑油膜,表面光滑,从而降低了磨损。     

PTFE复合材料力学性能及摩擦磨损机理的研究

研究了锡青铜粉不同含量的聚四氟乙烯（PTFE）复合材料的摩擦磨损性能,以及添加后对其力学性能的影响,并研究不同润滑介质下的摩擦磨损机理。结果表明：填充锡青铜粉后材料密度增大,邵氏硬度变大,拉伸强度下降;磨损率大幅下降;磨损过程以疲劳磨损为主,在干摩擦条件下伴有磨粒磨损。     

C／C-SiC复合材料的水润滑摩擦磨损特性研究

本文在MRH-3型环块式磨损试验机上,进行了C／C-SiC与Ni基合金摩擦副的摩擦磨损实验。测定了水润滑状态下,在相同转速,载荷,磨损时间条件下,配对摩擦副的摩擦系数和磨损率。用扫描电子显微镜（SEM）观察了配对摩擦副的磨损表面形貌。初步探讨了C／C-SiC复合材料的摩擦、磨损特性及机理,对C／C-SiC复合材料在水润滑条件下作为摩擦件使用提供了实验依据。     

润滑剂对Ti（CN）陶瓷摩擦学性能的影响

在销—盘试验机上考察了干摩擦、水润滑及油润滑条件下Ti(CN)/45钢摩擦副的摩擦磨损性能。Ti(CN)陶瓷的磨损主要由粘着剥落和微断裂引起,水对Ti(CN)/45钢摩擦副的摩擦性能无明显改善,但能较明显地减小陶瓷的磨损。油润滑时,摩擦和磨损均得到了明显改善。水和油润滑介质的存在能有效地抑制金属在陶瓷表面的粘着转移,从而降低陶瓷磨损率。采用SEM,XPS,AES等对陶瓷磨痕的分析结果表明,摩擦面上Fe_2O_3的生成对粘着磨损起到了一定的改善作用。油(不含添加剂的液体石蜡)在极压条件下的减磨作用主要是由于其在陶瓷摩擦面上形成了较厚的碳膜(焦质,石墨复合膜)。     

MCPA6/改性聚硅氧烷复合材料的摩擦磨损性能

采用阴离子聚合法制备了浇铸尼龙6(MCPA6)/改性羟基封端聚二甲基硅氧烷(MHPDMS)原位复合材料,研究了不同MHPDMS含量对复合材料在水润滑及干摩擦条件下的摩擦磨损性能影响。结果表明,在干摩擦条件下,复合材料的摩擦系数随滑动时间增加先增大后减小最后达到平衡,随着MHPDMS含量的增加,复合材料在稳定阶段的摩擦系数变化不大,但是磨损量逐渐减小,MHPDMS质量分数为4%的复合材料磨损量仅为MCPA6的25%;在水润滑条件下,复合材料的摩擦系数随滑动时间增加先增大后平衡,随着MHPDMS含量的增加,复合材料的稳定摩擦系数基本没有变化,磨损量先减小后增大,当MHPDMS质量分数为2%时,磨损量最小,为MCPA6的50%左右。复合材料在水润滑条件下的稳定摩擦系数比干摩擦条件下的小,但磨损量比干摩擦条件下的大很多。复合材料在干摩擦条件下的磨损机理主要是粘着磨损和疲劳磨损,而在水润滑条件下主要为犁削磨损和磨粒磨损。     

聚氨酯海绵改性环氧树脂复合材料的摩擦学性能研究

以聚氨酯（PU）海绵作为三维支撑材料,吸附氧化石墨烯（GO）和石蜡（PW）,制备了改性环氧树脂（EP）复合材料。对该复合材料进行摩擦学性能测试,结果表明：当PW质量为PU的3.5倍时,复合材料的摩擦系数最小,相比纯EP摩擦系数降低了57.77%;当PW质量为PU的2.5倍时,复合材料的比磨损率最低,相比纯EP比磨损率降低了94.08%。采用扫描电子显微镜对复合材料的磨损表面进行表征,认为GO和PW的协同作用对改善复合材料的摩擦学性能起着关键作用。     

Epoxy composite reinforced with three‐dimensional polyimide fiber felt: Fabrication and tribological properties investigation

Novel epoxy (EP) composite reinforced with three‐dimensional (3D) polyimide (PI) fiber felt (PI_3D/EP) is first fabricated by vacuum assisted resin transfer molding. The tribological behaviors of pure EP and PI_3D/EP composite under dry sliding and water lubricated condition are comparatively studied. Results indicate that both wear rates and friction coefficients of PI_3D/EP composite are lower than those of pure EP. The wear resistance of PI_3D/EP composite is 9.8 times higher than that of pure EP under dry sliding of 1.5 MPa and 0.76 m s^?1 while a 27‐fold increase is achieved under water lubricated condition. The wear mechanisms of PI_3D/EP composite are investigated based on tribological testing results and scanning electron microscopy observations. The PI fiber felt provides strong 3D structure supports to sustain most of the loads on the composite, improving the mechanical and tribological properties significantly. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44160.     

Tribological behavior of poly(ether ether ketone) composites filled with potassium titanate whiskers sliding in different media

The friction and wear properties of poly (ether ether ketone) (PEEK) composites filled with potassium titanate whiskers (PTWs) under alkali, water, and dry conditions were investigated. The wear mechanisms in different lubrication situations were studied on the basis of examinations of the worn and counterpart surfaces with scanning electron microscopy and optical microscopy. The results showed that PTWs could obviously increase the wear resistance and reduce the friction coefficient of the PEEK composites under dry sliding conditions. Only when the PTW content was greater than 35 wt % did the wear resistance and friction coefficient deteriorate. Sliding in water caused increases in the wear rate and friction coefficient of the PEEK composites, and the PTW‐filled PEEK composites showed the highest friction coefficient and wear rate under this lubrication condition. On the contrary, sliding in an alkaline solution, the PTW‐filled PEEK composites showed the lowest friction coefficient and almost the same level of wear resistance as that found under the dry condition. Furrows and abrasive wear were the main mechanisms for the PTW‐filled PEEK composites sliding in water. The transfer onto the counterpart rings was significantly hindered with sliding under water and alkali conditions. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

干滑动下端羟基聚丁二烯液体橡胶-环氧树脂复合材料的摩擦性能

用端异氰酸酯基聚丁二烯液体橡胶与环氧树脂制得端异氰酸酯基聚丁二烯橡胶-环氧树脂聚合物(ETPB)。在ETPB中分别加入质量分数为5%和10%的纳米三氧化二铝,并用胺类固化剂固化,制得ETPB/纳米三氧化二铝复合材料。测试了环氧树脂、ETPB和ETPB-纳米三氧化二铝复合材料在干滑动下的摩擦性能,考察了磨损率及摩擦系数与载荷和滑动速度之间的关系,用扫描电子显微镜对几种材料磨损表面进行了观察。结果表明,用端异氰酸酯基聚丁二烯液体橡胶改性环氧树脂可提高干滑动条件下环氧树脂的抗磨损性能;填充纳米三氧化二铝可显著提高ETPB的抗磨损性能,其最佳填充质量分数为5%。     

A synergistic effect of nano‐Tio2 and graphite on the tribological performance of epoxy matrix composites

The influence of incorporated 300 nm TiO₂ (4 vol %), graphite (7 vol %), or combination of both fillers on the tribological performance of an epoxy resin was studied under various sliding load (10–40 N) and velocity conditions (0.2–3.0 m/s). Mechanical measurements indicated that the incorporation of TiO₂ significantly enhanced the flexural and impact strength of the neat epoxy and the graphite including epoxy. Tribological tests were conducted with a cylinder‐on‐flat testing rig. The incorporation of nano‐TiO₂ significantly improved the wear resistance of the neat epoxy under mild sliding conditions; however, this effect was markedly diminished under severe sliding conditions (high velocity and normal load). Nano‐TiO₂ reduced the coefficient of friction only under severe sliding conditions. Graphite showed a beneficial effect in reducing the wear rate and the coefficient of friction of the neat epoxy. Compared to the nano‐TiO₂‐filled epoxy, the graphite‐filled epoxy showed more stable wear performance with the variation of the sliding conditions, especially the normal load. A synergistic effect was found for the combination of nano‐TiO₂ and graphite, which led to the lowest wear rate and coefficient of friction under the whole investigated conditions. The synergistic effect was attributed to the effective transfer films formed on sliding pair surfaces and the reinforcing effect of the nanoparticles. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2391–2400, 2006     

EP/氧化石墨烯–硬脂酸丁酯微胶囊复合材料

采用种子微悬浮聚合法制备了聚苯乙烯/氧化石墨烯复合囊壁包覆硬脂酸丁酯微胶囊润滑材料(MGO–Micro LMs),以MGO–Micro LMs为润滑填料,环氧树脂(EP)为基体材料,采用浇注成型工艺制备了EP/MGO–Micro LMs复合材料。采用滑动摩擦磨损试验仪评价了MGO–Micro LMs对EP基体材料摩擦学性能的影响;采用扫描电子显微镜对磨损面的微观形貌进行表征,并探究了其磨损机理。结果表明,MGO–Micro LMs能够显著地降低EP的摩擦系数和磨损量,当MGO–Micro LMs质量分数为20%时,EP/MGO–Micro LMs复合材料的摩擦系数为0.138 44,磨损量减少了约42.3%,磨损机理主要为磨粒磨损。     

Tribological behavior of carbon nanotube and polytetrafluoroethylene filled polyimide composites under different lubricated conditions

The friction and wear behavior of polyimide (PI) composites reinforced with carbon nanotube (CNT) and polytetrafluoroethylene (PTFE) were comparatively evaluated under dry sliding, water‐, oil‐ or alkali‐lubricated condition. The wear mechanisms of the composites were also discussed. Results indicate that, when comparison with the dry friction situation, PI‐based composites results lower friction coefficients and wear rates under oil‐ or alkali‐lubricated condition. The lowest wear rate of the CNT/PTFE/PI composite is recorded as 1.2 × 10⁻⁶ mm³/Nm during the composite sliding in alkali, which is only about 40% of the value sliding under dry friction condition. The worn surface of neat PI under dry sliding is characterized by severe adhesive wear, whereas abrasive wear is the main character for CNT/PTFE/PI composites. The worn surfaces of CNT/PTFE/PI composites sliding in oil or alkali lubricated condition are smoother than those under dry or water condition. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Influence of the hard segment content on the mechanical and tribological properties of the polyurethane modified by hydroxyl‐terminated polydimethylsiloxane under different lubricated conditions

Two kinds of polyurethane (PU) composites with different hard segment content modified by a high molecular weight hydroxyl‐terminated polydimethylsiloxane (HTPDMS) were prepared. The effect of the hard segment content on the mechanical and tribological properties of the PU composites was studied. Tensile strength of the PU composites increased with the increasing of the hard segment content. The friction and wear experiments were tested on a MRH‐3 model ring‐on‐block test rig at different sliding speeds and loads under different lubricated conditions. Experimental results revealed that the coefficient of friction (COF) and the wear rate value of the PU composites decreased with increasing hard segment content and the COF of the PU composites under dry friction was higher than that under water and sea water lubrication. Scanning electron microscopy (SEM) investigations showed that the worn surfaces of the PU under water and sea water lubrication were smoother than that under dry friction. Besides, the wear rate value of the PU composites under water and sea water lubrication was smaller than that under dry friction. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers     

纳米填充环氧树脂/玻璃纤维复合材料的摩擦磨损性能研究

分别将纳米三氧化二铝（Al2O3）、纳米二氧化钛（TiO2）、纳米二氧化硅（SiO2）颗粒和碳纳米管(CNTs)填充到环氧树脂(EP)/玻璃纤维(GF)复合材料中,制备了纳米填充EP/GF复合材料,GF的体积含量为30 %。用环块摩擦试验机研究了纳米填充物对EP/GF复合材料的摩擦磨损性能的影响。结果表明,1.0 %（质量分数,下同）的CNTs能够较大幅度地降低复合材料的摩擦因数和磨损率,而纳米Al2O3、纳米TiO2和纳米SiO2颗粒可以明显提高复合材料的耐磨损性能。     

Tribological Performance of Bamboo Fabric Reinforced Epoxy Composites

Bamboo fiber is one of the strongest natural fibers with high strength-to-weight and stiffness-to-weight ratios and can be used economically for manufacturing fiber-reinforced composites. In this paper, bamboo fabric-reinforced epoxy composite is manufactured and its tribological properties for load-bearing applications are investigated. Sliding wear tests are conducted using a linear reciprocating tribometer and the effect of dry and lubricated contact conditions, applied load, sliding speed, temperature, and woven fabric direction on the coefficient of friction and wear rate are investigated. A scanning electron microscope is used to define the wear mechanisms at room and elevated temperatures. It is observed that the fabric orientation influences the mechanical and tribological performances of the composite material. Wear rate increases at higher loads and working temperatures; however, the effect of sliding speed is not remarkable, especially under lubricated contact conditions. The results present in this paper can be used for designing bamboo-reinforced epoxy composites for load-bearing applications, under different working conditions.