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。     

PTFE/纳米SiC复合材料的摩擦磨损性能研究

利用冷压烧结法制备了不同含量的聚四氟乙烯/纳米碳化硅(PTFE/纳米SiC)复合材料。采用MM-200型摩擦磨损试验机在干摩擦条件下考察了纳米SiC含量及载荷对PTFE/纳米SiC复合材料摩擦磨损性能的影响,借助于扫描电子显微镜观察分析了试样磨损表面形貌,并探讨了其磨损机理。结果表明,纳米SiC能够提高PTFE/纳米SiC复合材料的硬度和耐磨性,当纳米SiC质量分数为7%时,PTFE/纳米SiC复合材料的磨损量最小,摩擦系数也最小;随纳米SiC含量的增加,其摩擦系数有所增大;随着载荷的增大,PTFE/纳米SiC复合材料的磨损量增加。     

聚丙烯腈纤维/MC尼龙6原位复合材料摩擦磨损性能研究

本文利用己内酰胺的阴离子原位聚合方法制备了聚丙烯腈纤维/MC尼龙6原位复合材料。对复合材料的摩擦磨损性能进行了测试,通过DSC、SEM等测试手段对复合材料的摩擦磨损机理进行探讨。结果表明原位复合材料的磨损机理是以磨粒磨损为主,同时还有粘着磨损和疲劳磨损。摩擦温度是摩擦系数大小的影响因素。原位复合材料的摩擦系数随载荷的增加而减小,磨损量随着载荷的增加而增加。在低载荷条件下,原位复合材料的摩擦系数大于MC尼龙6,当载荷增加时,聚合物表面软化熔融,起到了润滑作用使得复合材料的摩擦系数下降。     

纤维增强聚苯硫醚复合材料摩擦磨损性能的研究

分别以玻璃纤维(GF)与碳纤维(CF)作为增强体制备了聚苯硫醚(PPS)纤维增强复合材料。研究了GF/PPS和CF/PPS复合材料的摩擦磨损性能,以及不同体积分数的纤维增强体、不同载荷与滑动速度对复合材料的摩擦磨损性能的影响。结果表明:GF与CF的引入有效地提高了复合材料的摩擦磨损性能;随纤维体积分数的增加复合材料的摩擦系数逐渐增加,随载荷的增加复合材料的摩擦系数逐渐降低,但磨损率增大。     

硅酮母粒改性LLDPE的摩擦学性能研究

采用熔融共混和热压烧结制备了硅酮/线型低密度聚乙烯(LLDPE)复合材料,研究了硅酮母粒含量及实验载荷对复合材料摩擦学性能的影响。结果表明,随着硅酮母粒含量增加,复合材料的摩擦系数不断下降,说明硅酮母粒可有效改善LLDPE复合材料的润滑性能;当硅酮母粒含量为5%时,复合材料的磨损量降低90.7%,说明添加少量硅酮母粒就可以显著改善复合材料的抗磨损性能;当实验载荷由10 N增加到20 N时,复合材料的摩擦系数由0.33～0.54降到0.22～0.41,说明高载荷可进一步促使硅酮母粒迁移到摩擦表面,使磨损表面更易形成润滑膜。磨损表面结构分析显示,纯LLDPE表面塑性变形情况非常严重,磨损机理主要为黏着磨损和磨粒磨损,而添加硅酮母粒后,复合材料磨损表面变的光滑,主要为轻微的磨粒磨损。     

纤维增强铝硅酸盐玻璃陶瓷复合材料的摩擦学特性研究

在UMT-2微观磨损试验机（USA）上研究了SiC纤维增强铝硅酸盐玻璃陶瓷复合材料的摩擦学特性,且对摩擦表面进行了SEM观察和分析。研究结果表明：随着SiC纤维含量的增加,摩擦系数逐渐降低,但变化幅度较小。而当纤维含量（体积）低于25％时,复合材料的磨损量明显降低,而显微硬度却有较大提高;超过25％时,继续增加纤维的含量会导致复合材料耐磨性下降。SiC纤维增强铝硅酸盐玻璃陶瓷复合材料的摩擦系数随着载荷的增大显现先增大后减小的趋势,并且在载荷140N时达到最大值,而磨损量随着载荷的增大而增加。复合材料的主要磨损失效形式为磨粒磨损。     

玻璃纤维填充改性PTFE复合材料的摩擦磨损性能

为改善聚四氟乙烯(PTFE)高磨耗的缺点,通过冷压烧结成型工艺制备了玻璃纤维(GF)填充改性PTFE复合材料,探究了不同GF添加比例的PTFE/GF复合材料在不同转速下的摩擦磨损情况。采用三维视频显微镜观察了样品的表面磨痕深度,并借助扫描电子显微镜观察摩擦表面形貌同时分析磨损机理。结果表明,填充GF后的PTFE复合材料其摩擦系数虽有一定程度的升高,但其体积磨损率却大幅降低。当GF质量分数为20%时,复合材料的体积磨损率降到最低,并在转速为80 r/min时较纯PTFE降低了93.56%。观察分析微观形貌发现,随着GF含量的增大,复合材料的磨损机理逐渐由纯PTFE的犁耕磨损和粘着磨损向磨粒磨损转变,当GF含量为25%时,出现轻微的疲劳磨损。     

不同工艺条件下PEEK/CF复合材料摩擦磨损特性

以碳纤维(CF)为增强相,制备了在不同处理工艺下的聚醚醚酮(PEEK)/CF复合材料,采用摩擦磨损试验机对复合材料的摩擦学性能进行测试并通过三维形貌仪以及扫描电子显微镜分析磨痕微观形貌。研究结果表明,CF的添加会增加PEEK/CF复合材料的摩擦系数,而且随着CF含量的增加,摩擦系数也逐渐增加;但PEEK/CF复合材料的磨损量会随着CF含量的增加,呈现出先减小后增加的趋势。不经过热处理时,CF质量分数在20%时,磨损量从CF质量分数为0%的2.9×10~(–7) mm~3/(N·m)降至1.8×10~(–7) mm~3/(N·m),当CF质量分数为40%时,磨损量急剧增大。经过热处理后,PEEK/CF复合材料的耐磨性有所提升,当CF的质量分数为20%时,磨损量为1.2×10~(–7) mm~3/(N·m),相较于未热处理的复合材料,磨损量减少了35.4%。     

碱液中晶须增强PEEK复合材料的摩擦磨损性能

研究了不同含量PTW增强PEEK复合材料在碱液中的摩擦磨损性能,并与经典的CF增强PEEK复合材料对比,借助于SEM分析了磨损面和对偶面微观形貌,探讨了相关机理。结果表明,干摩擦时15%(质量)PTW增强PTFE/PEEK复合材料耐磨性是相同含量CF增强时的10.5倍。在碱液中,CF增加了PTFE/PEEK复合材料的摩擦系数、降低了其耐磨性能,而PTW可以进一步降低PTFE/PEEK复合材料的摩擦系数、明显地提高其耐磨性能。含5%PTW可提高PTFE/PEEK复合材料碱液中耐磨性2.36倍。碱液阻止了对偶面转移膜的形成,犁削和磨粒磨损是CF增强PEEK复合材料碱液中的主要磨损机制,而隧道状晶体结构和细微尺寸的纤维态形貌使得PTW在碱液中仍具有显微增强耐磨作用。     

PPS/PAI/CF复合材料摩擦磨损性能的研究

采用模压成型法制备了聚苯硫醚(PPS)/聚酰胺酰亚胺(PAI)合金及其碳纤维(CF)改性复合材料。测试分析了该复合材料的力学性能,并通过扫描电镜(SEM)对其摩擦磨损表面形貌进行了观察,探讨了复合材料的摩擦磨损性能;考察了PPS/PAI合金的最优配比及CF含量对PPS/PAI/CF复合材料性能的影响。结果表明:PAI的加入改善了PPS的力学性能,当PPS/PAI质量比为40/60时,PPS/PAI合金的力学性能最优;另外,CF的加入使PPS/PAI/CF填充复合材料的摩擦系数和磨损量大幅度下降,其中,当CF含量为30%时,PPS/PAI/CF填充复合材料的摩擦系数和磨损量较未填充PPS/PAI分别下降了66%和90%。     

聚四氟乙烯填充聚醚醚酮及其复合材料的研究

利用熔融共混工艺制备了ＰＥＥＫ／ＰＴＦＥ共混物及其复合材料,研究了ＰＴＦＥ对ＰＥＥＫ共混物及其复合材料力学性能和耐磨性的影响,结果表明,ＰＥＥＫ经１０％￣ＰＴＦＥ填充改性,玻纤／碳纤混杂增强后,由于磨损方式的改变,使该复合材料不仅保持了良好的物理力学性能,而且具有较低的摩擦系数,耐磨性也得到明显改善。     

PTFE改性玻纤增强MPPO材料力学性能及耐摩擦磨损性能的研究

采用直径为3.0μm的短玻纤(GF)(GF质量分数为20％)增强改性聚苯醚(MPPO),将其与粒径为5～7 μm的聚四氟乙烯(PTFE)微粉和甲基苯基硅油构成摩擦因数较低的耐磨体系.通过熔融共混法制备PTFE改性GF增强MPPO材料(简称MPPO/20％GF复合材料).对MPPO/20％GF复合材料的力学性能、热变形温...     

混杂填料增强PA6复合材料摩擦磨损性能

利用M-2000型摩擦磨损试验机考察载荷以及纳米Si_3N_4/SiO_2与玻璃纤维的混合填料对PA6复合材料摩擦磨损性能的影响,用扫描电子显微镜观察分析磨损表面形貌及磨损机理.结果表明:纳米材料与玻璃纤维的协同作用显著改善了材料的摩擦磨损性能,以3%纳米Si_3N_4与玻璃纤维混杂填充耐磨性最佳;以5%纳米SiO_2与玻璃纤维混杂摩擦因数最低.     

Mechanical and tribological properties of PA66/PPS blend. III. Reinforced with GF

Based on previous work, 70 vol % PA66/30 vol % PPS blend was selected as a matrix, and the PA66/PPS blend reinforced with different content of glass fiber (GF) was prepared in this study. The mechanical properties of PA66/PPS/GF composites were studied, and the tribological behaviors were tested on block‐on‐ring sliding wear tester. The results showed that 20–30 vol % GF greatly increases the mechanical properties of PA66/PPS blend. When GF content is 20 vol %, the friction coefficient of composite is the lowest (0.35), which is decreased by 47% in comparison with the unfilled blend. The wear volume of the GF‐reinforced PA66/PPS blend composite decreases with the increase of GF content. However, the wear‐resistance is not apparently improved by the addition of GF in the experimental range for comparison with unfilled PA66/PPS blend. The worn surface and the transfer film on the counterface were examined by scanning electron microscopy (SEM). The observations revealed that the friction coefficient of composite depends on the formation and development of a transfer film. The wear mechanism involves polymer matrix wear and fiber wear. The former consists of melting wear and plastic deformation of the matrix, while the latter includes fiber sliding wear, cracking, rupturing, and pulverizing. The contributions of the matrix wear and the fiber wear determine the ultimate wear volume of PA66/PPS/GF composite. In addition, the abrasive action caused by the ruptured glass fiber is also a very important factor. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 523–529, 2006     

Wear behavior of Al(OH)<Subscript>3</Subscript>-GF/epoxy composites in low velocity

Effects of fiber content, size, and weave form, and addition of particles on wear behaviors of epoxy composites are studied widely, while little investigation is paid on thermal effect in friction. In this study, effects of Al(OH)₃ powder on wear behavior of glass fiber reinforced epoxy composites are investigated. The experimental results show that within 6 wt%, the addition of Al(OH)₃ powder could decrease the friction surface temperature, friction coefficient, and wear mass loss of the composites. The decrease is attributed to the heat absorption when Al(OH)₃ powder decomposes. However, when the content of Al(OH)₃ powder increases to 9 wt%, the temperature, the friction coefficient, and the wear mass loss increase to nearly equal to those of pure epoxy resin-based composites. It is considered resulting from the decrease in mechanical property, which could lead to more serious fatigue wear. In a word, within a proper content, the addition of Al(OH)₃ powder in epoxy could increase the resistance to wear and friction.     

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。     

GF及偶联剂改性PVC/稻壳木塑复合材料

采用模压成型的方式、通过实验探索玻璃纤维(GF)含量及偶联剂处理对聚氯乙烯(PVC)/稻壳木塑复合材料的力学特性和耐磨性的影响。实验结果表明:PVC/稻壳木塑复合材料的硬度随GF含量增加呈现先减小后增大的趋势。GF含量在15%以下时,随着GF用量的增大,木塑复合材料的拉伸强度与冲击强度总体上随之变大,超过15%则随GF含量增大而减小。而弯曲强度出现先减后增的趋势,弯曲弹性模量则与之相反。木塑复合材料的耐磨损性在GF含量为15%时最佳,摩擦系数在10%时最大。合适的偶联剂处理能增强木塑复合材料的力学性能和耐磨性。其中γ–氨丙基三乙氧基硅烷(KH550)的增强效果比较好,钛酸酯不能提高PVC/稻壳木塑材料的力学性能和耐磨性。     

Friction and wear bahavior of short fiber-reinforced poly(amide-imide) composites

Tribological behavior of short fiber-reinforced thermoplastic composites was investigated experimentally and theoretically. Short carbon fiber and glass fiber reinforced poly(amide-imide) composites were tested. Titanium oxide powder-filled composite was also tested for comparison with the fiber composites. Block-on-ring type wear testing was performed for 24 h at three different sliding conditions. Frictional force was measured and stored by a data acquisition system and wear was measured as weight loss after the test. Wear tracks on the specimen and the counterface were examined with an optical microscope to observe fiber damage and formation of wear film. The equivalent stress distribution around each fiber at the sliding surface was calculated by employing a finite element program. The lowest friction and wear was obtained for the carbon fiber composite, the highest friction for the glass fiber composite, and the highest wear for TiO₂-filled one. It was observed that the glass fibers are damaged and removed from the surface more easily than the carbon fibers, and the finite element analysis also suggests easier debonding of glass fibers.