纳米SiO_2、硅灰石复合填充PA1010复合材料的摩擦学性能研究

用纳米SiO2机械包覆硅灰石填充尼龙1010制备复合材料,对复合材料进行拉伸、硬度和摩擦磨损实验,并与纯硅灰石填充尼龙1010的复合材料进行对比。结果表明:纳米SiO2机械包覆硅灰石填充尼龙1010大幅度提高了尼龙复合材料的耐磨性,降低了摩擦因数;当纳米SiO2/硅灰石复合颗粒填充质量分数为20%时,复合材料达到最低摩擦因数0.307和最低磨损量1.27 mg,分别比纯尼龙降低了51.35%和55.86%。     

碳纤维增强尼龙1010复合材料的摩擦磨损性能及磨损机理研究

以注塑成型法制备了尼龙1010及碳纤维(CF)增强尼龙1010复合材料，研究了CF含量和载荷对材料摩擦学性能和磨损机制的影响。结果表明，CF的加入可显著改善尼龙的摩擦学性能，以体积分数为20％的CF增强尼龙1010复合材料的耐磨性能最好。较低的CF含量下复合材料磨损表面主要受到对偶钢环上微凸峰的切削和犁沟作用，较高载荷时发生了热疲劳剥层磨损；随着CF含量增加，复合材料表面在较高载荷时产生明显疲劳断裂，并使对偶钢环产生较剧烈磨损。     

ZnOw填充铸型尼龙复合材料滚动摩擦磨损行为

研究ZnOw填充铸型尼龙(MC)复合材料的滚动摩擦学性能.结果表明,ZnOw/MC复合材料的拉伸强度随氧化锌晶须含量增加而升高,而断裂伸长率随氧化锌晶须含量的增加而降低;ZnOw/MC复合材料的摩擦因数和磨损率均随氧化锌晶须含量增加而降低;随着氧化锌晶须填充量的增加,磨损.ZnOw/MC复合材料的磨损机制由黏着磨损变为疲劳     

纳米ZnO填充PTFE复合材料的力学及摩擦学性能

通过机械搅拌和超声分散制备纳米ZnO填充PTFE复合材料,研究纳米ZnO填充量对复合材料力学及摩擦磨损性能的影响。结果表明:当ZnO质量分数小于3%时,复合材料的拉伸强度与纯PTFE相比略有增高;复合材料的密度、硬度、摩擦因数随ZnO填充量的增加而逐渐增大;当ZnO填充质量分数为1%～3%时,复合材料的磨耗量大幅下降,但若继续增加ZnO填充量,复合材料的磨耗量却变化不大。     

氧化锌晶须填充尼龙1010复合材料的摩擦磨损性能

采用模具挤压成型的方法制备了氧化锌晶须填充尼龙1010复合材料,使用纳米力学测试系统测试了不同含量氧化锌晶须复合材料的硬度和弹性模量,在UMT试验机上考察了复合材料的摩擦磨损性能,然后对磨损表面进行了SEM观察。结果表明：复合材料的硬度和弹性模量随氧化锌晶须含量的增加而增大;ZnOw在保持尼龙1010摩擦性能的同时,可使其耐磨性能提高60％左右。纯尼龙的主要磨损机制为粘着磨损和熔融,填充ZnOw后复合材料的磨损机制转变为疲劳剥层。     

ZnO填充尼龙1010的摩擦磨损行为研究

采用热挤压方法制备了含不同添加量的微米ZnO尼龙1010(PA1010)复合材料，对复合材料的力学性能和摩擦学性能进行了实验研究，并利用扫描电子显微镜对其磨损机理进行分析。结果表明，ZnO质量分数小于10％时，复合材料的拉伸强度与PA1010相当，而硬度明显提高。ZnO含量对复合材料的摩擦学性能有显著影响，ZnO质量分数介于3％～10％时填充效果最好。复合材料的磨损机理随ZnO含量的不同而发生变化。     

纳米SiO2包覆硅灰石填充改性尼龙1010的摩擦学性能

以硅灰石和水玻璃为主要原料,用无机化学沉积法制备纳米SiO2包覆硅灰石复合颗粒;利用扫描电镜和X射线衍射分析对包覆效果进行表征。将复合颗粒填充到尼龙1010中,对此复合材料进行拉伸、硬度和摩擦磨损实验,并与分别用硬脂酸改性硅灰石、未处理硅灰石填充的尼龙复合材料进行对比。结果表明,将纳米颗粒包覆硅灰石填充到尼龙1010中,可获得较好的结合界面,提高了尼龙复合材料的拉伸强度和硬度,比硬脂酸改性和未经处理的硅灰石更有效地改善了尼龙的摩擦学性能。     

氧化锌晶须填充尼龙1010的接触和摩擦学性能研究

用球-平面接触方式,测定ZnOw填充尼龙复合材料的压痕蠕变、球压痕硬度和摩擦磨损性能.试验结果表明,压痕试验中尼龙复合材料的压痕深度和蠕变柔量随试验时间而增加.尼龙复合材料的抗压痕蠕变性能和球压痕硬度均随ZnOw的含量增加而增强.尼龙复合材料的蠕变模型符合典型三参数线性粘弹性模型,模型中弹簧刚度和阻尼系数均随ZnOw含量的增加而增加.对摩擦因数和蠕变模型中的时间常数,磨损率和硬度分别进行相关分析,得出摩擦因数与时间常数之间为正比二次方程曲线关系、磨损率和硬度之间为反比二次方程曲线关系.     

Tribological studies of glass fabric-reinforced polyamide composites filled with CuO and PTFE

The effect of glass fabric reinforcement on the friction and wear behavior of nylon was investigated for varying fabric proportions. The effect of the addition of particulate CuO filler, and the filler and PTFE to the glass fabric-reinforced composites on the tribological properties of the composites was also studied. The composites with different proportions of fiber, filler and PTFE were compression molded and tested for friction and wear in a pin-on-disk configuration. It was found that the proportion of glass fabric for optimum wear resistance was about 20% by volume. The addition of CuO filler did not contribute to improvement in the wear resistance of the fabric-reinforced composites because a good transfer film did not develop in the presence of fibers and the composites became fragile. PTFE was very effective in reducing the wear of filled and fabric-reinforced composites. The friction and wear behavior of these composites has been interpreted in terms of their ability to form transfer film on the steel counterface and the changes occurring on the pin surface. The composition for maximum wear resistance was 25 vol.% CuO-11.3 vol.% glass fabric-10 vol.% PTFE-nylon.     

Friction and wear of powder coatings of epoxy composites with alumosilicate nanoparticles

The paper studies the effect of alumosilicate nanofillers of tubular and lamellar shape on the friction and wear of epoxy composites. It is shown that the influence of concentration and shape of the fillers on the tribological behavior of the composites is due to variations in their viscoelastic properties and shielding of the contact area of the matrix material with the metallic counterbody by the filler particles. The data evidence that at equal concentrations of alumosilicate fillers in the epoxy matrix, the best tribological characteristics are provided in the case of tubular-shaped particles.     

Effect of transfer film structure, composition and bonding on the tribological behavior of polyphenylene sulfide filled with nano particles of TiO2, ZnO, CuO and SiC

The tribological behavior of polyphenylene sulfide (PPS) filled with inorganic nano particles was studied. The fillers investigated were TiO₂, ZnO, CuO and SiC whose sizes varied from 30 to 50 nm. The polymer composites were compression molded with varying proportions of these fillers. Wear and friction tests were performed in a pin-on-disk configuration at a sliding speed of 1.0 m/s, nominal pressure of 0.65 MPa, and counterface roughness of 0.10 μm Ra. The polymer composite pins slid against hardened tool steel counterfaces. The transfer films of the composite materials formed on the counterfaces during sliding were studied by optical microscopy and X-ray photoelectron spectroscopy (XPS) and the adhesion between the transfer film and counterface was measured in terms of the peel strength. It was found that the wear rate of PPS decreased when TiO₂ and CuO were used as the fillers but increased with ZnO and SiC fillers. The optimum wear resistance was obtained with 2 vol.% CuO or TiO₂. These filled composites had the coefficients of friction lower than that of the unfilled PPS. The wear behavior of the composites is explained in terms of the topography of transfer film and adhesion of transfer film to the counterface as observed from peel strength studies. There is a good correlation observed between the transfer film-counterface bond strength and wear resistance.     

玻璃微珠填充改性含油铸型尼龙的摩擦学和热性能

以玻璃微珠为填料制备了玻璃微珠填充改性含油铸型尼龙复合材料,研究了复合材料的摩擦争性能和热性能。结果表明：加入玻璃微珠的复合材料的摩擦因数降低,耐磨性提高,其磨损行为主要是粘着磨损和磨粒磨损;该复合材料的热变形温度有所降低,但线膨胀系数减小。     

混杂填料改性UHMWPE复合材料的摩擦学性能

采用热压成型工艺制备铜粉、石墨粉、碳纤维混杂改性的UHMWPE复合材料,采用WDW-20电子万能实验机测量其力学性能,采用MM-2000试验机考察其摩擦学性能,用扫描电子显微镜观察复合材料磨损表面形貌能。结果表明:混杂填料的加入增加复合材料的硬度和弹性模量,降低复合材料的抗剪强度、抗拉强度;混杂填料对复合材料的摩擦因数影响很大,填充比例适当时能有效改善复合材料的耐磨损性能;改性后复合材料的磨损机制主要表现为磨料磨损、疲劳磨损和塑性变形;15%Cu+2%Gr+6%CF复合材料具有良好的摩擦学性能。     

硫酸钙晶须填充PTFE复合材料的摩擦学性能研究

用硫酸钙晶须(CSW )填充改性聚四氟乙烯(MVE),采用模压成型工艺制备不同硫酸钙晶须含量的PTFE/CSW复合材料;利用摩擦磨损试验机研究硫酸钙晶须对PTFE/CSW复合材料摩擦学性能的影响,利用扫描电子显微镜对PM复合材料的磨损表面进行微观分析.结果表明:填充硫酸钙晶须提高PTFE复合材料的耐磨损性能,但复合材料的摩擦因数略高于纯PTFE;纯PTFE的磨损机制为黏着磨损,而PTFE/CSW复合材料的磨损机制为轻微磨粒磨损和黏着磨损共同作用.当硫酸钙晶须质量分数大于10%时,PTFE/CSW复合材料的磨损机制逐渐转变为严重的磨粒磨损.     

微米氧化铝/尼龙复合材料在不同条件下的滚滑摩擦磨损行为研究

以微米氧化铝(Al2O3)为增强剂,尼龙1010为基体,进行氧化铝/尼龙复合材料在干摩擦和水润滑条件下的滚滑动摩擦磨损实验。通过实验发现,水能降低氧化铝/尼龙复合材料的摩擦因数,但增大了磨损量。水润滑时,尼龙1010材料的摩擦因数为0.09,为干摩擦时的45%;氧化铝/尼龙复合材料的平均摩擦因数为0.1195,比尼龙增加了24.7%,是干摩擦时的42%。水润滑时尼龙1010的磨损量为干摩擦时的2.5倍,复合材料平均磨损量为干摩擦时2.8倍。     

硫酸钙晶须填充UHMWPE复合材料的摩擦磨损性能

以硫酸钙晶须(CSW)作为填料填充改性超高分子量聚乙烯(UHMWPE),采用热压成型法制备了不同硫酸钙晶须含量的UHMWPE/CSW复合材料;在销-盘摩擦磨损试验机上考察了硫酸钙晶须对UHMWPE/CSW复合材料摩擦学性能的影响,利用扫描电子显微镜对UHMWPE复合材料的磨损表面进行了微观分析。结果表明:随着硫酸钙晶须填充量的增加,复合材料的硬度逐渐增大,耐磨性能逐渐增加,摩擦因数逐渐减小;当硫酸钙晶须填充质量分数为20%时,UHMWPE/CSW复合材料的摩擦学性能最好。     

Tribological behaviour of polymeric coatings. Part I. Aramid particle‐reinforced epoxy nanocomposite systems

An epoxy‐based nanocomposite containing a low concentration of nanometric TiO₂ (4 vol. %), graphite powder (7.21 vol. %), and 2–14 vol. % aramid particles was developed as a coating material. The mechanical and tribological performance of the composites was investigated. The epoxy filled only with TiO₂ possessed significantly improved impact strength and flexural properties, whereas the further incorporation of graphite and aramid particles had a deleterious effect on most of the mechanical properties, except the modulus. The tribological behaviour of the composites was tested in sliding and fretting modes. Under sliding conditions, the addition of nanometric TiO₂ alone significantly improved the wear resistance and decreased the coefficient of friction compared to the neat epoxy. The sliding wear and friction behaviour was further enhanced with the incorporation of graphite and aramid particles. Contrary to the sliding wear behaviour, the fretting wear and friction behaviour was worse for the epoxy filled only with TiO₂, but was significantly enhanced by the incorporation of graphite and aramid particles. The optimum aramid particle content for sliding and fretting wear of the epoxy‐based nanocomposite was determined as 10 vol. %.     

PTFE对纤维增强尼龙66材料摩擦学性能的影响

考察了玻璃纤维（GF）增强尼龙66复合材料的摩擦磨损性能,以及PTFE对复合材料摩擦学性能的影响,利用扫描电镜分析了磨损形貌。结果表明：15％GF增强尼龙复合材料的摩擦学性能改善不明显,而且磨损量高于纯尼龙;加入PTFE在摩擦过程中形成了转移膜,降低了玻璃纤维增强尼龙复合材料的摩擦磨损,改善了其摩擦学性能。     

氧化锌晶须填充尼龙的划痕实验

用划痕测试方法测定了ZnOw填充尼龙1010复合材料的划痕系数和划痕过程中的声发射信号。结果发现,当ZnOw含量小于20%(质量分数)时,划痕系数随ZnOw的含量线性增加。纯尼龙材料在划痕过程中没有发生声发射事件,而复合材料的声发射振铃计数随ZnOw的含量线性增加。根据ZnOw的特殊空间结构,建立了其在尼龙基体的细观几何模型,并根据模型得出了划痕系数与晶须含量的关系。模型计算结果与试验结果相一致。     

Effects of filler crystal structure and shape on the tribological properties of PTFE composites

In this paper, effects of filler crystal structure and shape on the friction and wear properties of potassium titanate whisker (K₂Ti₄O₉ whisker, K₂Ti₆O₁₃ whisker), TiO₂ whisker and TiO₂ particle filled polytetrafluoroethylene (PTFE) composites under dry friction conditions were studied. Meanwhile the influence of filler content, sliding duration, test speed and load were also investigated. Experimental results show that the friction coefficients of various PTFE-based composites are weakly dependent on filler shape but they are more strongly dependent on filler crystal structure. However, for improving the anti-wear property of PTFE, filler crystal structure has less importance than filler shape in the wear-reducing action of PTFE-based composites, and whisker-like filler is better than particle-like filler.