碳材料填充PTFE复合材料摩擦磨损性能

利用 MM-200 型磨损试验机考察了石墨、碳纤维、硬碳和软碳填充 PTFE 复合材料的摩擦磨损性能,采用扫描电子显微镜观察分析磨损表面形貌及磨损机制.结果表明,碳材料可以不同程度地提高 PTFE 的耐磨性,它们对PT-FE 耐磨性的提高程度各不相同,其中以硬碳填充 PTFE 复合材料的磨损质量损失最小,石墨填充 PTFE 复合材料的磨损质量损失较大;不同填充材料对 PTFE 摩擦因数的影响各不相同,其中石墨填充 PTFE 的摩擦因数较小.石墨、软碳填允复合材料磨损机制以粘着磨损为主,硬碳、碳纤维复合材料,则表现为粘着磨损和磨粒磨损.     

聚四氟乙烯及其石墨和MoS2填充复合材料的摩擦学性能研究

利用往复式摩擦磨损实验机,对聚四氟乙烯(PTFE)及石墨和MoS2填充的PTFE复合材料的摩擦磨损性能进行了实验,考察了载荷、速度以及对摩时间的影响,并利用光学显微镜对PTFE复合材料的摩擦磨损表面进行了观察。结果表明,填加了石墨和MoS2的PTFE,由于石墨和MoS2一方面起到了润滑作用,另一方面阻止了PTFE带状大面积破坏,因而使得PTFE的摩擦因数降低,耐磨性提高。加入石墨和MoS2后PTFE的磨损机制由以犁沟效应和粘着磨损为主变为以磨粒磨损为主。     

短玻璃纤维和石墨填充PTFE的摩擦磨损特性研究

利用自主研制的往复式摩擦试验机对短玻璃纤维(SGF)及石墨填充聚四氟乙烯(PTFE)复合材料的摩擦磨损特性进行了研究,探讨了共混材料对PTFE摩擦学性能的影响。利用扫描电子显微镜对材料的磨损表面进行了观察和分析。研究结果表明,短玻璃纤维有效提高了PTFE的承载能力,石墨的加入起到了减小摩擦的作用,在较高载荷下,短玻璃纤维和石墨填充的PTFE复合材料表现出优异的抗磨性能。     

低含量磷片石墨填充改性PTFE复合材料的摩擦磨损性能

为了改善聚四氟乙烯高磨耗的缺点,通过冷压烧结成型工艺制备4种低含量鳞片石墨填充改性聚四氟乙烯(PTFE)复合材料,探究其在较高载荷(0.8 MPa)及不同转速下的摩擦磨损情况。采用三维视频显微镜观察样品的表面磨痕深度,借助扫描电镜观察摩擦表面形貌并分析磨损机制。结果表明:在较高载荷下石墨填充PTFE复合材料的摩擦因数和体积磨损率都较纯PTFE有一定程度的降低;且当石墨填充质量分数为5%时,复合材料的摩擦因数和体积磨损率降到最低,在载荷为0.8 MPa、转速为80 r/min时较纯PTFE分别降低了19.7%和84.25%;在较高载荷下,随着石墨含量的增大,复合材料的磨损机制逐渐由犁耕磨损向黏着磨损转变,且当石墨质量分数为10%时,出现轻微的疲劳磨损。     

石墨填充聚四氟乙烯基复合材料的摩擦学性能

为了研制PTFE基粘弹-摩擦型阻尼材料,采用机械共混-冷压成型-烧结的工艺制备了石墨、聚苯硫醚、聚醚醚酮混合填充PTFE基复合材料,利用环-块式磨损试验机,在干摩擦条件下考察了复合材料的摩擦学性能,并用扫描电镜观察了磨损表面形貌,研究了复合材料的磨损机制。结果表明:PTFE含量不同的复合材料,随石墨填充量的增大,摩擦因数和磨损率的变化趋势不同,磨损主要由犁削、粘着和疲劳剥落中的一种或几种引起;适当配比的PTFE基复合材料具有较好的摩擦阻尼性能,能够满足粘弹-摩擦阻尼材料的要求。     

纳米高岭土和石墨填充PTFE复合材料摩擦磨损性能

采用模压法制备石墨和纳米高岭土填充的聚四氟乙烯(PTFE)复合材料,在往复式滑动摩擦磨损试验机上测试了其的干滑动摩擦磨损性能,试验机往复频率为1.0 Hz.用扫描电镜观测和分析试样的磨损表面.结果表明:石墨和纳米高岭土共同填充的PTFE,在改善其耐磨性的同时,又保持了低的摩擦因数,其中含10%高岭土和5%石墨的PTFE复合材料表现最佳,稳定阶段的摩擦因数保持在0.11左右,耐磨性比纯PTFE提高了大约90倍.     

PTFE、石墨与玻璃纤维填充聚甲醛的摩擦磨损特性研究

用聚四氟乙烯(PTFE)、玻璃纤维(GF)和石墨填充聚甲醛(POM),采用热模压成型制备出4种复合材料。在往复式滑动摩擦试验机上进行摩擦磨损实验。实验条件为正压力5.8 MPa,往复频率1 Hz,对摩面粗糙度Ra0.8μm。结果表明:经填充的POM复合材料的摩擦因数和比磨损率均有不同程度的降低,其中POM 20%(质量分数)PTFE的摩擦因数最低,POM 20%PTFE 10%GF的耐磨性最好。扫描电镜分析表明POM材料的磨损机制以粘着磨损为主。     

聚四氟乙烯与超细高岭土填充聚甲醛复合材料的摩擦学性能

用聚四氟乙烯(PTFE)和超细高岭土填充聚甲醛(POM),采用热模压成型工艺制备出四种不同成分的试样,在往复式滑动摩擦试验机上进行摩擦磨损试验,并对磨损表面形貌进行了分析.结果表明:只填充PTFE的复合材料的摩擦因数和磨损率较纯POM均有较大幅度的下降,7.5%高岭土与20%PTFE复合填充的复合材料摩擦因数最小,耐磨性最好;纯POM的磨损机制是粘着磨损和磨粒磨损,POM复合材料的磨损机制以粘着磨损为主.     

纳米碳黑与纳米石墨填充PTFE复合材料摩擦磨损性能比较研究

用M-2000摩擦磨损试验机对纳米碳黑和石墨填充PTFE复合材料进行了摩擦磨损性能研究,用扫描电子显微镜(SEM)对磨损表面进行观察.结果表明:2种碳纳米能够提高PTFE复合材料的耐磨性,其中纳米碳黑填充效果最佳.纳米碳黑和纳米石墨2种碳纳米的最佳添加量分别为7%和5%(质量分数).纳米石墨可以减小PTFE复合材料的摩擦因数,而纳米碳黑使得PTFE复合材料的摩擦因数增大,且含量越高,复合材料摩擦因数增幅越大.结晶型纳米石墨与PTFE基体的相容性较差,而无定形纳米碳黑与PTFE基体的相容性较好.     

PTFE复合材料的摩擦磨损性能研究

用机械共混、冷压成型烧结的方法制备了纳米SiO2/石墨/玻璃纤维/PTFE复合材料试样。用MM-200型磨损试验机测试了在干摩擦条件下不同载荷时各试样的摩擦磨损性能;用扫描电镜对磨损后试件表面进行观察和分析。研究结果表明：纳米SiO2和玻璃纤维有效提高了PTFE的承载能力,石墨的加入起到了减小摩擦的作用;在本试验条件下,在摩擦过程中三元混合填充PTFE复合材料在偶件表面形成了转移膜,减少了复合材料与偶件的直接接触,因而表现出优异的抗磨性。     

氧化锌晶须/聚醚砜复合材料的制备及摩擦学性能研究

采用机械共混-模压成型方法制备了ZnOw/PTFE/PES复合材料,通过摩擦磨损实验方法对材料的摩擦学性能进行了研究,并用SEM对磨损表面进行了观察和分析,探讨了复合材料的磨损机制。结果表明:用机械共混-模压法能制得摩擦学性能优良的ZnOw/PTFE/PES复合材料;随着ZnOw含量的增加,复合材料的磨损机制由黏着磨损及疲劳磨损、轻微的黏着磨损向磨粒磨损及疲劳磨损的转变。     

Sliding wear behaviour of PEEK‐PTFE blends

The role of PTFE in tailoring the tribological performance of PEEK is not clear from the literature, and conflicting evidence is reported about its ability to improve friction, wear, or both. Moreover, little has been reported on the optimum composition of such blends for the best possible combination of mechanical and tribological properties. Hence, in this work various blends of PEEK with PTFE have been injection moulded and characterised for their mechanical properties. Their friction and wear behaviour was evaluated using a pin‐on‐disc machine. It was observed that the inclusion of PTFE powder not only removed scuffing problems associated with the friction behaviour of PEEK, but also improved both friction and wear characteristics. A blend with 7.5 wt. % PTFE showed the best wear behaviour, while a blend with 30 wt.% PTFE exhibited the best friction performance. A concentration of 7.5 wt. % PTFE was thought to be the optimum amount for the best possible combination of mechanical and tribological properties.     

Influence of PTFE content in PEEK-PTFE blends on mechanical properties and tribo-performance in various wear modes

Few papers are available on the optimum composition of PEEK-PTFE blends for the best possible combination of mechanical and tribological properties in the adhesive wear mode. Nothing is reported in this context on low amplitude oscillating/fretting wear mode. Moreover, the influence of increasing amounts of PTFE in the blend on abrasive wear behaviour along with a correlation with strength properties is not reported. Hence, in this work, five injection-moulded blends of PEEK with PTFE (in the range of 0-30 wt.%) were evaluated on a pin-on-disc configuration on an SRV Optimol Tester for their tribo-behaviour in the low amplitude oscillating wear mode. The data in the abrasive wear mode were generated by abrading a pin loaded against an abrasive paper fitted on the rotating disc. Data on neat PTFE were also included for comparison. It was observed that inclusion of PTFE affected the adhesive wear and low amplitude oscillating wear (LAOW) in a beneficial way. With an increase in PTFE contents, coefficient of friction in both the wear modes (adhesive and low amplitude oscillating) decreased but the trends in wear performance differed. In the adhesive wear mode, the specific wear rate showed minima for 7.5% PTFE inclusion followed by a slow increase for further PTFE addition. In the case of LAOW mode, on the other hand, the wear rate continuously decreased for the selected compositions. The 30% PTFE blend showed excellent combination of μ, wear rate and limiting pressure-velocity (PV) values. Unfilled PEEK proved to be fairly good wear-resistant material but exhibited high μ, a stick-slip tendency and a low PV limit value. Abrasive wear performance of the blends on the other hand, deteriorated with increasing amount of PTFE. Fairly good correlation was observed between the wear rate and product of H and S (H-hardness and S-ultimate tensile strength) rather than Ratner-Lancaster plot (product of S and e, where e is elongation to break).Thus, with increase in PTFE contents, though adhesive and LAOW performance increased substantially, it was at the cost of deterioration in all mechanical properties (except impact strength) and abrasive wear performance.     

Tribological Characterization of Aromatic Thermosetting Copolyester–PTFE Blends in Air Conditioning Compressor Environment

The tribological behavior of a wide range of compositions using blends of aromatic thermosetting polyester (ATSP) with polytetrafluoroethylene (PTFE) has been investigated. PTFE was chosen as the blending material because of its low coefficient of friction and good performance at high temperatures and resistance to chemicals. ATSP blends were used to specifically combat some of the shortcomings of PTFE like its extremely low wear resistance and poor mechanical properties, and special processing requirements due to its high melt viscosity. Controlled tribological experiments simulating an air conditioning compressor operating with R134a refrigerant under realistic operating conditions were carried out with different ATSP/PTFE compositions, as well as four different state-of-the-art commercially available composites containing carbon fibers, graphite and PTFE. It was found that the newly synthesized composites exhibited superb tribological characteristics as far as low friction and low wear were concerned. The wear performance of PTFE was greatly improved, while it was shown that greater amounts of ATSP used in the blend lead to lower wear and the amount of ATSP did not significantly alter the friction coefficient. Material transfer and development of a weak film on the disk surface was observed, especially for the blends with higher PTFE content.     

填料对聚四氟乙烯工程塑料改性的影响

研究了MoS2、PbS、石墨、玻璃纤维、碳纤维等填料对聚四氟乙烯（PTFE）工程塑料抗磨损、摩察系数、表面硬度、耐冲击强度等性能的影响。结果表明：填料可将PTFE的磨损量降低2个数量级，石墨和适量硬质填料的协同作用对PTFE的改性效果比较理想，既降低了PTFE的磨损量，增大了表面硬度，又提高了耐冲击强度。对其作用机理进行了分析和探讨，为材料的性能优化提供理论依据。     

Physical and tribological properties of PTFE micropowder-filled EPDM rubber

The physical and tribological properties of ethylene-propylene-diene-rubber (EPDM) filled with polytetrafluoroethylene (PTFE) micropowders, i.e. MP1100 and MP1200 having chemically similar but distinctive microstructural morphology have been investigated. EPDM-PTFE micropowder blends filled with MP1200 having a solid granular structure, showed poor tensile strength and elongation at break but significantly improved tribological properties. It attained both the lowest steady-state friction coefficient and specific wear rate. However, EPDM-PTFE blends containing a fine agglomerated PTFE micropowder of MP1100 showed enhanced physical properties. Its increasing tensile strength and elongation at break with PTFE micropowder loading compared to MP1200-filled EPDM blend was essentially due to its characteristic morphology, which enhanced its dispersion and compatibility with EPDM. It showed specific wear rate similar to MP1200-filled EPDM but resulted in high friction coefficient. Scanning electron microscopy (SEM) of the PTFE micropowders and the corresponding PTFE micropowder-filled EPDM blends suggest that agglomerates morphology, dispersion and interfacial compatibility with EPDM are the key factors influencing physical and tribological properties of these compounds.     

MoS2、CdO及聚全氟乙丙烯填充改性聚四氟乙烯复合材料的摩擦磨损性能

用机械共混、冷压成型自由烧结的方法制备了MoS2、CdO和聚全氟乙丙烯填充聚四氟乙烯复合材料;用MM-2000型摩擦磨损试验机测试了在干摩擦条件下该复合材料的摩擦磨损性能;用扫描电镜(SEM)对磨损试样的表面形貌进行观察和分析.结果表明:未添加聚全氟乙丙烯的复合材料其摩擦磨损性能比添加的好;当CdO的体积分数为22.5%,MoS2的体积分数为7.5%时,复合材料的摩擦因数最小,抗磨性强,复合材料的摩擦磨损性能最佳.     

干摩擦工况下Si3N4/PTFE配副材料摩擦磨损特性与转移膜形成分析

为使全陶瓷轴承在干摩擦工况下可靠运转,选用四氟乙烯(PTFE)材质的保持架为全陶瓷轴承提供润滑.利用Rtec销/盘摩擦磨损试验机,以PTFE盘与氮化硅(Si3 N4)销为摩擦副,研究Si3 N4/PTFE在不同载荷和转速条件下的摩擦磨损性能,通过SEM对Si3 N4表面的转移膜形貌进行观察,分析转移膜形成原因.结果表明...     

Tribo-investigation on PTFE lubricated PEEK in harsh operating conditions

A series of blends with Polytetrafluroethylene (PTFE) powder and Polyetheretherketone (PEEK) was developed by varying the PTFE contents in steps of 5 wt.% from 0 to 20 wt.%. The composites were evaluated for their friction and wear properties at room temperature as well as high temperature in low amplitude oscillating wear (LAOW) mode against steel (100 Cr 6) ball against polymer plate. The same blends were also evaluated in abrasive wear mode to study the influence of harsh operating conditions on wear and friction performance. Incorporation of PTFE benefited PEEK in various ways such as it increased the tribo-utility of the latter by increasing its limiting load value, removing its stick-slip tendency, lowering coefficient of friction and specific wear rate significantly. With increase in PTFE content, benefits to the wear performance increased regularly. This was not the case for friction coefficient. Lowest μ was recorded for 15% PTFE contents. The enhancement in wear and friction performance, however, was at the cost of strength properties which decreased substantially with increase in PTFE content. At 100 °C, friction coefficient and wear rates of all blends increased marginally. In abrasive wear mode, on the other hand, PTFE filled PEEK showed poorer wear resistance than neat PEEK. This was correlated with strength properties and it was observed that these blends closely followed the predictions of Ratner–Lancaster plot. SEM was used to examine the micro-structural features of worn surfaces.