酸性溶液中PTW增强PTFE复合材料的耐蚀性和摩擦磨损性能

分别研究了不同含量钛酸钾晶须(PTW)、碳纤(CF)填充聚四氟乙烯(PTFE)复合材料在硫酸溶液中和干摩擦条件下摩擦学性能以及酸中的耐蚀性能,借助SEM等分析探讨了相关机理。结果表明,酸中纯PTFE耐磨性较干摩擦条件下提高了2个数量级,摩擦系数也只有干摩擦的15.3%。与CF/PTFE相比,PTW/PTFE复合材料在酸中显示更好的耐蚀和耐磨性能。PTW可以进一步提高PTFE酸中耐磨性能、降低摩擦系数。含15%（质量）PTW时复合材料具有最低的磨损率,此时比纯PTFE酸中耐磨性提高13.8倍,是相同含量CF/PTFE耐磨性的3.2倍。由于酸溶液的冷却和润滑作用,复合材料的摩擦系数与干条件相比明显降低。然而,酸溶液阻止了转移膜的形成。不管是干摩擦还是在酸性溶液中,当填料含量超过15%（质量）时,犁削和磨粒磨损是PTFE复合材料的主要磨损机理。     

碳纤维和纳米氮化硼增强聚醚醚酮/聚四氟乙烯复合材料的摩擦学性能研究

以碳纤维（CF）为增强相，添加不同含量的纳米氮化硼（h-BN），通过注塑成型的方式，制备了聚醚醚酮/聚四氟乙烯（PEEK/PTFE）复合材料样条，使用力学试验机进行拉伸试验，利用摩擦试验机进行表面摩擦试验，并利用白光仪对磨痕数据和三维形貌进行观测，使用SEM对磨痕进行观测与分析。结果表明：随着h-BN含量的增加，PEEK/PTFE复合材料样条最大应力先增加后减小；当h-BN含量分别为3%、6%时，PEEK/PTFE复合材料样条的最大应力分别为174 MPa、165 MPa。与PEEK/PTFE相比，单独添加CF的样品摩擦系数降至0.23。同时添加CF、h-BN时，复合材料样条的摩擦系数均降低；h-BN含量分别为3%、6%时，复合材料样条的摩擦系数分别为0.06、0.09。随着h-BN含量的升高，PEEK/PTFE/CF/h-BN复合材料的磨损率先降低后升高。h-BN含量为3%时，复合材料样条的磨损率最低。     

腐蚀环境中纤维增强聚四氟乙烯复合材料的摩擦磨损性能研究

分别研究了不同含量碳纤维(CF)、玻璃纤维(GF)填充聚四氟乙烯（PTFE）复合材料在硫酸溶液中和干摩擦条件下的摩擦学性能,同时考察了PTFE复合材料在酸中的腐蚀行为,探讨了相关机理。结果表明,在酸中GF能够提高PTFE的耐磨性,比CF在提高PTFE耐磨性方面具有更好的优势。就酸溶液中的耐磨性和耐腐蚀性而言,15 %（质量分数,下同）是填料的最佳含量,此时GF和CF填充的PTFE,耐磨性分别较纯PTFE提高了7.7和4.4倍;当填料的含量超过15 %时,复合材料的耐磨性和耐腐蚀性均下降,主要是由于此时犁削和磨粒磨损是PTFE复合材料的主要磨损机制。由于酸溶液的冷却和润滑作用,硫酸溶液中PTFE复合材料的摩擦因数大幅降低,但酸溶液抑制了对磨面上转移膜的形成。     

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%。     

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。     

水润滑下偶件表面粗糙度对碳纤维增强PEEK复合材料摩擦学性能的影响

以聚醚醚酮(PEEK)复合材料为销样,316不锈钢材料为盘样,在销-盘摩擦磨损试验机上考察了水润滑条件下偶件表面粗糙度对纯PEEK及碳纤维增强PEEK复合材料摩擦学性能的影响,并用光学显微镜观察了PEEK复合材料的磨损表面形貌。结果表明,在水润滑条件下,碳纤维增强PEEK复合材料的耐磨性能明显提高,磨损率比纯PEEK的磨损率降低了4~6倍。当偶件表面粗糙度R_a处于0.08~0.09μm范围内时,PEEK复合材料可以取得较低的磨损率;当偶件表面粗糙度R_a的值过高或者过低时,摩擦磨损机理将发生改变。     

PTFE填充PI基复合材料摩擦学性能

以聚四氟乙烯(PTFE)为填料,聚酰亚胺(PI)为基体,通过机械冷压法制备了聚酰亚胺/聚四氟乙烯(PI/PTFE)自润滑复合材料。研究了PTFE在复合材料中质量分数对该材料和金属试件对磨时摩擦学性能的影响。结果表明:在一定质量范围内PTFE的加入对于提高复合材料耐磨性具有积极的促进作用。当PTFE质量分数为30%时,PI/PTFE复合材料磨损率最低。和纯PI相比,填充PTFE的复合材料耐磨性提高3个数量级。对试件磨损形貌的分析表明:在对偶面形成转移膜的连续性直接影响PI/PTFE复合材料的摩擦磨损行为。对应最佳摩擦学性能时形成的自润滑转移膜更加连续、光滑和完整。     

纳米AlN填充PTFE复合材料的摩擦性能研究

以纳米氮化铝（削N）为填料制备了聚四氟乙烯（PTFE）复合材料，研究了该复合材料在干摩擦条件下与不锈钢对摩时的摩擦磨损行为．结果表明：纳米AlN填充FIFE基复合材料的耐磨性能明显优于纯PTFE。不同用量纳米AlN填充PTFE复合材料的摩擦系数最多上升16．5％，而耐磨性最多却能提高150倍，当纳米AlN用量为5％，FIFE复合材料的耐磨性最好。SEM观察发现：纯PTFE的磨损表面上分布着大量的带状结构，有明显的犁削和粘着磨损的痕迹。当复合材料中纳米AlN用量较低时，复合材料的磨损机制主要表现为不同程度的黏着磨损，但当复合填料中纳米AlN用量较高时，复合材料的磨损机制主要表现不同程度的黏着磨损和磨粒磨损，同时其复合材料的摩擦磨损性能出现了恶化现象。     

聚苯硫醚耐磨改性研究

为提高聚苯硫醚(PPS)的耐磨性能,采用了质量分数均为40%的玻璃纤维(GF)和碳纤维(CF)增强PPS,研究对比了它们的摩擦磨损性能,发现CF增强PPS的摩擦系数和磨损率均低于GF增强PPS。在此基础上,采用聚四氟乙烯(PTFE)和纳米Si O2对GF增强PPS进行复合耐磨改性,研究了PTFE和纳米Si O2含量对GF增强PPS摩擦磨损性能及电绝缘性能的影响。结果表明,相对于质量分数为40%的CF增强PPS,在相同质量分数的GF增强PPS中采用质量分数均为10%的PTFE和纳米Si O2,可以在较低成本下使其获得更低的摩擦系数、磨损率,以及滚动摩擦时的磨损质量和磨损体积,同时保持良好的电绝缘性能。     

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。     

Durable polytetrafluoroethylene composites in harsh environments: Tribology and corrosion investigation

The tribological properties and mass loss of polytetrafluoroethylene (PTFE) composites filled with carbon fiber (CF) or potassium titanate whisker (PTW) after the immersion in 30% sulfuric acid solution for 5 or 15 days were studied under different temperatures (25, 50, and 75°C). Results show that PTW/PTFE composites exhibit better anticorrosive and antiwear properties than those of CF/PTFE composites. Acid immersion has no obvious effect on the wear rate of the PTW/PTFE composite. The wear rate of CF/PTFE immersed for 15 days is thrice as much that of untreated composites and 3.6 times as much that of PTW/PTFE composites. Results also indicate that the wear rate of PTFE composites increases with the increasing corrosive mass loss rate and is more dependent on the corrosive mass loss rate rather than the friction coefficient. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

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     

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。     

Tribological behavior of polyetheretherketone composites containing short carbon fibers and potassium titanate whiskers in dry sliding against steel

Polyetheretherketone (PEEK) composites reinforced by short carbon fibers (SCF) and potassium titanate whiskers (PTW) were prepared using twin‐screw extrusion compounding and injection molding. The tribological properties of hybrid composites were investigated in dry sliding condition against steel. The effects of filler contents on the wear behavior were studied. It was found that the hybrid composite showed an excellent tribological property in dry sliding condition. Applied load had great effect on the tribological behavior of the composites. In most cases, the friction coefficient of the composite decreased with the load rising. The composites with higher CF contents showed outstanding tribological performances at low load but could worsen the wear behavior at high load. Because of the positive effect of PTW, high PTW loading composites presented low wear rate at low load. At high loads, the composites with lower PTW contents had better wear resistance. The scanning electron microscopy (SEM) observation revealed that abrasion wear was attributed to the lower wear resistance of the high PTW content composite at high load. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Mechanical properties and sliding wear behavior of potassium titanate whiskers‐reinforced poly(ether ether ketone) composites under water‐lubricated condition

Polyetheretherketone (PEEK) composites reinforced with potassium titanate whiskers (PTW) were compounded using a twin‐screw extruder followed by injection molding. The effects of PTW on the mechanical properties, crystallization performances and wear behaviors of PEEK under water lubrication have been investigated. It was denoted that the yield strength, Young's modulus, and microhardness of the composites increased with increasing whisker content, but the elongation at break and the impact strength showed decreasing trend. It was revealed that the inclusion of PTW could effectively reduce the friction coefficient and enhance the wear resistance of the PEEK. The DSC tests showed that the crystallinity of the composite slightly decreased with the addition of PTW, which might imply that the crystallinity of PEEK was not the dominant factor that influenced the wear properties of the composites. The enhancement on the wear resistance was attributed to the reinforced effect of PTW on PEEK. The wear mechanism changed from fatigue wear into mild abrasive wear when the PTW was added into PEEK. The lowest wear rate 9.3 × 10^?8 mm³/Nm was achieved at 10 wt % PTW content. However, excessive whiskers would cause severe abrasive wear to the composite. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

超细氧化钛纤维对PEEK摩擦学和热性能的影响

研究了超细氧化钛纤维对PEEK摩擦磨损、耐热和结晶性能的影响,并与nano-TiO₂粒子增强PEEK作对比,探讨了相关作用机理。结果表明：与nano- TiO₂微粒相比,超细TiO₂纤维具有更强的显微补强、显微耐磨作用,填充超细TiO₂纤维的PEEK表现出更好的减摩耐磨特性和耐热性能。无论在较低载荷还是较高载荷下,超细TiO₂纤维/PEEK复合材料的摩擦系数和磨损率均低于nano- TiO₂/PEEK复合材料,且其磨损面、对偶面更加平整光滑。载荷200 N时,5%～10%相似文献   

Influence of cenosphere on tribological properties of short carbon fiber reinforced PEEK composites

This investigation focuses on the effects of cenosphere fillers on tribological properties of carbon fiber reinforced PEEK composites. Dry sliding wear behavior of 15 wt % short carbon fiber (SCF) reinforced PEEK composites filled with 5, 10, 15, and 20 wt % cenosphere was reported in this study, pure PEEK and 15 wt % SCF reinforced PEEK composites were also prepared for comparative analysis. Friction and wear experiments were conducted on a ring-on-block apparatus under different loads (100–400 N). The experimental results showed that all the composites exhibited lower coefficient of friction and better wear resistance than the matrix resin under different load conditions. It is noted that 10 wt % of the cenosphere particles filled SCF reinforced PEEK composites show superior tribological properties when compared to the other composites in this study. The morphologies of the worn surface and the fracture surface were analyzed by scanning electron microscopy and the transfer film was observed by optical microscope to understand the dominant wear mechanisms. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47245.     

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。