Influence of Re-adhesion on the Wear and Friction of Glass Fibre-Reinforced Polyester Composites

Based on the well-known pin-on-disc test rig, a new test setup for online measuring of wear and friction behaviour of polymer matrix composites has been developed. In contrast to a traditional friction-and-wear test rig, a steel pin and composite disc are used for studying the influence of wear debris and fibre orientation. During sliding, a thin adhesive film is possibly formed on the wear track of a composite disc, consisting of wear debris that is squeezed under the steel pin and that finally smoothens onto the composite surface. By optical microscopy, it was observed that most of the debris particles originate from the edges of the wear track. The thin film deforms continuously, with large and dark wear particles observed at the edge of the wear track. A lower coefficient of friction is achieved when the particles are re-adhered to the mating surface. The film formation mechanism depends on the normal force, sliding velocity, and bulk composite structure: because pultruded composite profiles are presently used with a layered structure, a change in film properties is observed depending on the wear depth.     

EP/三维编织PE–UHMW纤维复合材料的摩擦磨损性能

以三维编织超高分子量聚乙烯(PE–UHMW)纤维为增强体,环氧树脂(EP)为基体,通过树脂传递模塑工艺制备了EP/三维编织PE–UHMW纤维复合材料,研究了纤维含量和载荷对复合材料摩擦系数与磨损率的影响,并采用扫描电子显微镜对复合材料磨损表面进行了分析。结果表明,随着纤维体积含量的增加,复合材料的摩擦系数和磨损率逐渐减小;随着载荷的增大,复合材料的摩擦系数逐渐减小,但磨损率增大;复合材料的磨损机制以粘着磨损为主。     

BF/黑宝石粉体增强EP基摩擦材料的摩擦磨损性能

以环氧树脂(EP)为基体,玄武岩纤维(BF)为增强材料,玄武岩水晶玻璃(黑宝石)粉体为摩擦性能调节剂制备BF/黑宝石粉体增强EP基摩擦材料,研究了黑宝石粉体对摩擦材料摩擦磨损性能和力学性能的影响,然后在添加质量分数为5%的黑宝石粉体的基础上,采用相同手段研究了BF含量对摩擦材料性能的影响。结果表明,黑宝石粉体可以极大地提高摩擦材料的摩擦系数,并进一步降低磨损率以及提高摩擦材料的力学性能。BF的加入在一定程度上降低了摩擦材料的摩擦系数,且当BF含量较低或较高时,摩擦材料的磨损率均会有所提升。当BF质量分数为6%时,摩擦材料的综合性能最优,其摩擦系数为0.534,与未加BF的摩擦材料相比仅降低了7.61%,磨损率为0.75%,较未加BF的摩擦材料降低了31.82%,拉伸强度和弯曲强度分别为55.568 MPa和92.750 MPa,与未加BF的摩擦材料相比,分别提高了148%和66.42%。     

Friction and Wear of MoO3/Graphene Oxide Modified Glass Fiber Reinforced Epoxy Nanocomposites

In order to further improve the tribological performance of glass fiber reinforced epoxy (GF/EP) composites, highly flexible, binder‐free, molybdenum trioxide MoO₃ nanobelt/graphene oxide (GO) film (f‐MoO₃‐GO) is prepared by a hydrothermal method. Herein, f‐MoO₃‐GO is adopted to modify GF/EP composites prepared through the vacuum‐assisted resin transfer molding method. The neat GF/EP and MoO₃‐GO modified GF/EP composites are also fabricated for comparison. The tribological performance is performed using a ball‐on‐disc (“steel‐on‐polymer”) configuration under a dry sliding condition. The coefficient of friction is reduced from 0.61 for neat GF/EP composites down to 0.23 for f‐MoO₃‐GO modified GF/EP (f‐MoO₃‐GO/GF/EP) composites and the anti‐wear performance is improved by more than four times. The worn surface morphological observation for the composite samples is used to explain the possible wear micro‐mechanisms. The wear reducing effect of the f‐MoO₃‐GO/GF/EP composites can be assigned to the increased self‐lubricating effect of f‐MoO₃‐GO. With the combined advantageous properties of the used individual components, these unique composites can be used for many other applications.     

纳米SiO2与玻璃纤维混杂增强聚酰胺6复合材料的摩擦磨损性能研究

采用MM-200型摩擦磨损试验机对干摩擦条件下纳米SiO2与玻璃纤维混杂填充聚酰胺6(PA6)复合材料与45#钢对摩时的摩擦磨损性能进行了研究。结果表明,纳米SiO2和玻璃纤维混杂可以显著改善PA6复合材料的摩擦磨损性能,以5 %的SiO2和20 %的玻璃纤维增强PA6的耐磨减摩性最好。扫描电镜分析表明,纯PA6的磨损以黏着和犁削为主。当载荷较低时,复合材料的磨损机制主要表现为不同程度的磨粒磨损,但当载荷较高时,复合材料的磨损机制主要表现为不同程度的疲劳磨损。     

环氧复合涂层的摩擦磨损性能研究

综述了环氧复合涂层摩擦磨损性能的研究进展,阐述了不同填料单一填充和复合填充改性对环氧复合涂层摩擦磨损性能的影响,分析了不同填料改性环氧复合涂层的摩擦磨损机制。多种填料之间存在性能互补性,易产生协同效应,多种填料复合填充可提高环氧复合涂层的减摩耐磨性能,使环氧复合涂层具有更优异的摩擦磨损性能。     

硅纳米材料与玻璃纤维混杂填充PA6复合材料的摩擦磨损性能研究

采用MM-200型摩擦磨损试验机对在干摩擦条件下3种硅纳米材料（纳米SiC、SiO2及Si3N4）与玻璃纤维混杂填充聚酰胺6（PA6）复合材料与45#钢对磨时的摩擦磨损性能进行了研究,并采用扫描电子显微镜对复合材料的磨损表面进行了观察。结果表明,3种纳米硅材料都能减小复合材料的摩擦因数,其中以纳米SiO2与玻璃纤维混杂效果最佳,纳米SiC、SiO2及Si3N4的最佳含量分别为3 %、5 %和3 %。纳米SiO2和纳米Si3N4能够提高复合材料的耐磨性,而纳米SiC会导致复合材料的磨损量增大。     

玻纤对湿热环境下的环氧复合材料拉伸性能的影响

为了研究湿热环境下玻璃纤维对环氧复合材料拉伸性能的影响,建立试验模型,以不同浸润剂配方生产的相同单丝直径及TEX值的玻璃纤维进行浸胶制样,样条在95℃下1%浓度的NaCl溶液中浸泡24 h、72 h后,样条拉伸强度变化,从而得出玻璃纤维对在湿热环境下环氧复合材料拉伸性能的影响,即选用合适的偶联剂生产的玻璃纤维,对复合材料湿态拉伸强度有明显的提升。     

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。     

Effect of Braking Speed on Friction and Wear Behaviors of C/C-SiC Composites

Carbon fiber-reinforced silicon carbide matrix composites (C/C-SiC) have received considerable attentions because of their superior friction and wear behaviors. In this paper, C/C-SiC composites were fabricated by the reaction melt infiltration method, and the braking performance, the microstructure of friction surface, and wear debris at different braking speeds were also investigated. The mean coefficient of friction increases to the maximum value of 0.52 at 10 m/s and then declines afterwards with an increase in the braking speed. The higher coefficient of friction at low braking speed indicates the excellent braking performance of the C/C-SiC composites for low braking energy. Excellent wear resistance is demonstrated by the low wear rate of the C/C-SiC composites in comparison with C/C composites.     

玻璃纤维／环氧树脂复合材料的热性能

本文采用E-玻璃纤维作为增强材料、双酚A环氧树脂和芳胺类固化剂作为基体制成复合材料试样,利用动态与静态热分析方法测定玻璃纤维／环氧树脂基复合材料的热性能,研究了玻璃纤维含量对复合材料动态热机械性能、玻璃化温度等热性能的影响。     

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。     

聚四氟乙烯/纳米氮化钛复合材料的摩擦磨损性能研究

利用摩擦磨损试验机考察了填料含量及载荷对纳米氮化钛(TiN)填充聚四氟乙烯(PTFE)复合材料摩擦磨损性能的影响,采用扫描电子显微镜观察分析磨损表面形貌,探讨了磨损机理。结果表明,纳米TiN可以提高PTFE的硬度和耐磨性,当纳米TiN质量分数为7%时,PTFE纳米TiN复合材料的磨损量最小;随载荷的增大,PTFE/TiN复合材料的磨损量增加。PTFE纳米TiN复合材料的摩擦因数比纯PTFE小。     

聚合物基复合材料摩擦与磨损性能的研究进展

介绍了聚合物及其复合材料的摩擦与磨损性能,包括聚四氟乙烯(PTFE)、含PTFE及其他聚合物基复合材料的耐磨性能,讨论了填料的种类、尺寸、含量以及填料的协同作用对聚合物基复合材料耐磨性能的影响.结果显示:填料能较好地改善聚合物基复合材料的摩擦磨损性能.并总结了聚合物基复合材料摩擦磨损性能的研究方向.     

空心玻璃微珠/环氧树脂基复合泡沫材料研究进展

综述了环氧树脂基复合泡沫材料中空心玻璃微珠的改性方法,以及近几年来环氧树脂基复合泡沫材料在强度、密度、吸水率等方面的研究进展。并展望了环氧树脂基复合泡沫材料的未来发展方向。     

Temperature Effects on Friction and Wear of Thermoset Polyester Fabric Composites

The tribological properties of unsaturated polyester with a plain weave polyester fabric and poly(tetrafluoro-ethylene) fillers are evaluated in reciprocating sliding at 23 to 220°C. Thermogravimetric analysis and differential scanning calorimetry show that poly(tetrafluoro-ethylene) restricts the thermostability, while the curing reaction becomes more pronounced in the presence of poly(tetrafluoro-ethylene). The pure polyester composites show continuously increasing friction and overload above 120°C, while the poly(tetrafluoro-ethylene)-filled composites indicate a regime of increasing friction up to 100°C, decreasing friction at 100–160°C, and increasing friction above 160°C. The infrared spectra of worn composites have absorption bands representing poly(tetrafluoro-ethylene), curing, and degradation of the matrix.     

Multifunctional Characteristics of Glass Fiber-Reinforced Epoxy Polymer Composites with Multiwalled Carbon Nanotube Buckypaper Interlayer

In this work, multiwalled carbon nanotube buckypaper (MWCNT-BP) was inserted at the middle-plane of glass fiber/epoxy resin prepregs to obtain three-phase nanostructured composite. Preliminary tests conducted by differential scanning calorimetry and thermogravimetric analyses (TGA) revealed that the proposed curing cycle to prepare the laminates in a hot compression-molding machine was appropriated. The mechanical properties of the BP-based composite studied by short beam shear and compression shear tests presented no improvements compared to the base laminate. On the other hand, the thermal properties of the nanostructured composite improved as demonstrated by dynamical mechanical analyses and TGA. Besides, the reflectivity results revealed an average value of −12.2 dB in the X-band with a maximum attenuation of 99.4% of the incident wave at 9.5 GHz. The improvements in both thermal and electromagnetic properties demonstrate the potential for both structural and multifunctional applications of the obtained BP-composite. POLYM. ENG. SCI., 60:740–751, 2020. © 2020 Society of Plastics Engineers     

空心玻璃微珠改性环氧树脂的制备及其性能研究

以双酚F环氧树脂为基体,以空心玻璃微珠为填料,制备环氧树脂绝缘复合材料。用硅烷偶联剂KH-570对空心玻璃微珠进行表面改性,并研究改性后的空心玻璃微珠对复合材料力学性能、热机械性能以及电绝缘性能的影响。实验结果表明:随着填料含量的增加,力学性能表现出先增加再降低的趋势,并在空心玻璃微珠含量为4%时,性能达到最优;热机械性能和介电性能均随填料含量的增加而呈现降低的趋势,并在空心玻璃微珠含量为8%时,介电常数最低。     

空心玻璃微珠填充环氧树脂复合材料压缩性能研究

制备了空心玻璃微珠 (HGM )填充环氧树脂复合材料 ,对材料进行了单轴静态压缩实验。研究了HGM的粒径和体积分数 (Vf)对材料压缩性能的影响 ,研究发现 ,Vf增大 ,材料中HGM外部空气泡的含量增大 ;材料的压缩强度和压缩模量可在 5 0～ 10 0MPa和 1.5 0～ 1.80GPa之间调节 ;材料断裂应变较小 ,用扫描电镜观察了其结构形态和破坏形式 ,断裂面与应力方向约成 45°角 ,破坏主要由HGM的破裂引起 ;HGM粒径减小 ,材料压缩强度增大 ;Vf 增大 ,压缩强度减小 ,压缩模量先增大后减小 ,断裂应变减小。用改进Turcsanyi方程对压缩强度进行了模拟计算 ,材料的密度与计算值基本一致     

硫酸钡填充聚四氟乙烯复合材料的摩擦磨损性能研究

用M 2000型摩擦磨损试验机研究了干摩擦条件下硫酸钡、载荷、对磨时间对聚四氟乙烯复合材料摩擦磨损性能的影响。结果表明:在本实验采用的条件下,硫酸钡/PTFE复合材料的摩擦因数随着硫酸钡含量的增加而增大,抗磨损能力则有一个最佳含量;随着载荷的增加,材料的摩擦因数、磨损量和磨痕宽度也随之增大;磨损量随着对磨时间的延长,波动变小并趋于稳定。