sPS/PA66/g-sPS/纳米A12O3粒子复合材料性能

以间规聚苯乙烯sPS-sPS/Al2O3纳米粒子复合材料;测量了纳米复合材料的力学性能和热性能,并用扫描电[英文作者]PA66/g复合,制备出sPS-sPS合金具有明显的增韧增强[英文作者]PA66/g镜观察了材料的显微组织结构.研究结果表明:纳米Al2O3粒子对于sPS/PA99/g-sPS合金具有明显的增韧增强作用;随着纳米A12O3粒子质量为6g时,复合材料的拉伸强度最大,纳米复合材料的冲击强度和拉伸强度均出现先升高后下降的变化趋势.     

纳米Al2O3和聚四氟乙烯填充聚醚醚酮基复合材料摩擦学特性研究

以热压成型法制备了纳米Al2O3和聚四氟乙烯(PTFE)填充聚醚醚酮基(PEEK)复合材料,利用销盘摩擦磨损试验机研究了干摩擦条件下纳米Al2O3和PTFE填充PEEK的摩擦磨损特性.结果表明,纳米Al2O3使PTFE填充PEEK复合材料的摩擦磨损特性得到明显改善,其改善程度与纳米Al2O3的填充量有关,当纳米Al2O3的含量较低(3%)时,纳米Al2O3-PTFE-PEEK复合材料与钢对偶面产生的磨损模式以磨粒磨损和犁削为主;而当纳米Al2O3的含量较高(10%)时,纳米Al2O3填充PEEK的磨损模式主要是粘着磨损;纳米Al2O3的含量为5%～7%时,PEEK复合材料的摩擦系数和比磨损率最低.随着载荷的增加,纳米Al2O3-PTFE-PEEK复合材料的摩擦系数将因纳米粒子效应和表面摩擦温升呈现下降趋势.     

纳米Al2O3和聚四氟乙烯填充聚醚醚酮基复合材料摩擦学特性研究

以热压成型法制备了纳米Al2 O3 和聚四氟乙烯 (PTFE)填充聚醚醚酮基 (PEEK)复合材料 ,利用销盘摩擦磨损试验机研究了干摩擦条件下纳米Al2 O3 和PTFE填充PEEK的摩擦磨损特性。结果表明 ,纳米Al2 O3 使PTFE填充PEEK复合材料的摩擦磨损特性得到明显改善 ,其改善程度与纳米Al2 O3 的填充量有关 ,当纳米Al2 O3 的含量较低 (3% )时 ,纳米Al2 O3 PTFE PEEK复合材料与钢对偶面产生的磨损模式以磨粒磨损和犁削为主 ;而当纳米Al2 O3 的含量较高 (10 % )时 ,纳米Al2 O3 填充PEEK的磨损模式主要是粘着磨损 ;纳米Al2 O3 的含量为 5 %～ 7%时 ,PEEK复合材料的摩擦系数和比磨损率最低。随着载荷的增加 ,纳米Al2 O3 PTFE PEEK复合材料的摩擦系数将因纳米粒子效应和表面摩擦温升呈现下降趋势     

纳米Al2O3改性酚醛树脂在汽车制动摩擦材料上的应用

用偶联剂KH570对纳米Al2O3进行表面处理,经透射电镜检测,发现纳米Al2O3能够均匀有效地分散在酚醛树脂中,并确定了纳米Al2O3质量为树脂质量的6%时分散性最好.运用共混的方法,对酚醛树脂进行纳米Al2O3改性处理,分析了纳米Al2O3的质量为树脂质量的2%,4%,6%,8%和10%时,改性酚醛树脂对汽车制动摩擦材料性能的影响.结果表明:经过表面处理的纳米Al2O3改性醛醛树脂,当纳米Al2O3质量为树脂质量的6%时,酚醛树脂的性能提升最明显,酚醛树脂的热分解温度提高了41℃,且降低失重率,纳米Al2O3改性酚醛树脂制备的摩擦材料的摩擦系数最稳定,具有较低的磨损率.     

纳米Al2O3和聚四氟乙烯填充聚醚醚酮基复合材料摩擦学特性研究

以热压成型法制备了纳米Al2O3和聚四氟乙烯(PTFE)填充聚醚醚酮基(PEEK)复合材料，利用销一盘摩擦磨损试验机研究了干摩擦条件下纳米Al2O3和PTFE填充PEEK的摩擦磨损特性。结果表明，纳米Al2O3使PTFE填充PEEK复合材料的摩擦磨损特性得到明显改善，其改善程度与纳米Al2O3的填充量有关，当纳米Al2O3的含量较低(3％)时，纳米Al2O3-PTFE-PEEK复合材料与钢对偶面产生的磨损模式以磨粒磨损和犁削为主；而当纳米Al2O3的含量较高(10％)时，纳米Al2O3填充PEEK的磨损模式主要是粘着磨损；纳米Al2O3的含量为5％～7％时，PEEK复合材料的摩擦系数和比磨损率最低。随着载荷的增加，纳米Al2O3-PTFE-PEEK复合材料的摩擦系数将因纳米粒子效应和表面摩擦温升呈现下降趋势。     

Fe3O4复合丁腈橡胶的力学和摩擦学性能

研究了填充纳米Fe3O4粒子对丁腈橡胶(NBR)力学性能、摩擦学性能的影响.结果表明:填充纳米Fe3O4粒子后丁腈橡胶的力学性能略有降低,但其表现了良好的抗磨、减摩性能,其中填充质量分数为12%时材料的摩擦学性能最优.随着填充质量分数的增加,材料的磨损形式由犁削和粘着磨损逐步转变为粘着、疲劳剥落.磁性纳米Fe3O4粒子有利于在摩擦表面形成自修复膜,从而起到抗磨、减摩的作用.     

铁铝氧化物纳米粒子对土壤有机碳矿化作用的影响

目的:了解纳米Fe2O3和纳米Al2O3颗粒对土壤有机碳分解矿化作用的影响.方法:以若尔盖高寒草甸土为研究对象,采用室内培养实验方法,测定不同纳米材料对土壤呼吸强度的影响.结果:在一个培养试验周期内,添加Al2O3纳米颗粒后土壤呼吸作用增强,添加Fe2O3纳米粒子的土壤呼吸作用变化不明显;随纳米材料加入量增加,土壤呼吸强度的变化无显著差异;结论:Al2O3纳米粒子能够一定程度增强土壤有机碳分解矿化作用,Fe2O3纳米粒子对土壤有机碳分解矿化作用的影响不大.     

纳米Al_2O_3/MC尼龙6原位复合材料的晶型转变

采用原位阴离子聚合法制备PA6/Al2O3纳米复合材料,借助广角X射线衍射(WXRD)研究其晶型结构和晶型转变.结果表明,淬冷样品均呈现单一的γ晶型;在较高温度下退火2 h后,Al2O3的引入更有利于基体PA6的γ晶型向α晶型转变;纯PA6的Brill转变温度在150～180 ℃之间,Al2O3质量分数为1.0%的PA6/Al2O3原位复合材料的Brill转变温度130～150 ℃之间.     

纳米二氧化硅改性环氧树脂复合材料的性能研究

利用硅烷偶联剂对纳米SiO2进行表面改性,进而通过共混法将改性后的纳米SiO2粒子分散到环氧树脂(Epoxy)中,制备了不同纳米SiO2含量的SiO2/EP复合材料.利用IR,SEM和TGA、阻抗分析仪等研究了SiO2添加量对复合材料微观结构、热稳定性和介电性能的影响.结果表明,随着纳米SiO2含量的增加,SiO2/EP复合材料的热稳定性逐渐升高,介电常数和损耗因数则呈先降低后增加趋势;当纳米SiO2含量为4%时,纳米颗粒在复合材料中分散均匀,复合材料的热稳定性好,介电性能最优(当测试频率为1GHz,介电常数为2.86,介电损耗为0.023 53).分析了复合材料热稳定和介电性能变化的微观机理.     

纳米Al_2O_3改性酚醛树脂的摩擦磨损性能研究

利用专利中所述的方法制备纳米Al2O3含量为酚醛树脂5%的纳米改性酚醛树脂。通过SEM分析其显微结构;并用该纳米改性酚醛树脂材料进行摩擦磨损试验,分析其热衰退性能。结果表明:纳米粉在酚醛树脂中的分散情况较好。纳米改性酚醛树脂较纯酚醛树脂的热衰退和耐磨性有很大提高。     

纳米Al2O3对聚乙烯工程材料性能的影响

采用压制和烧结的方法，制备了纳米Al2O3和超高分子量聚乙烯的复合材料。用MPV－200型摩擦磨损试验机和腐蚀磨损试验机研究了纳米Al2O3粒子对超高分子量聚乙烯工程塑料的摩擦磨损性能的影响。结果表明：纳米Al2O3粒了不仅显著地提高了超高分子量聚乙烯的耐磨性，而且降低了超高分子量聚乙烯的摩擦系数，同时使得超高分子量聚乙烯的硬度增大，扩大了超高分子量聚乙烯材料的应用范围。     

偶联剂改性纳米Al2O3粒子对NBR改性酚醛树脂摩擦磨损性能的影响研究

通过对比试验,研究偶联剂改性纳米Al2O3粒子对丁腈改性酚醛树脂摩擦磨损性能的影响。结果表明:铝锆偶联剂添加到纳米Al2O3粒子改性丁腈酚醛可显著提高酚醛树脂的耐热性、增加摩擦系数、降低磨损率。     

Influence of nano-Al<Subscript>2</Subscript>O<Subscript>3</Subscript>-reinforced oxide-dispersion-strengthened Cu on the mechanical and tribological properties of Cu-based composites

The mechanical and tribological properties of Cu-based powder metallurgy (P/M) friction composites containing 10wt%–50wt% oxide-dispersion-strengthened (ODS) Cu reinforced with nano-Al₂O₃ were investigated. Additionally, the friction and wear behaviors as well as the wear mechanism of the Cu-based composites were characterized by scanning electron microscopy (SEM) in conjunction with energy-dispersive X-ray spectroscopy (EDS) elemental mapping. The results indicated that the Cu-based friction composite containing 30wt% ODS Cu exhibited the highest hardness and shear strength. The average and instantaneous friction coefficient curves of this sample, when operated in a high-speed train at a speed of 300 km/h, were similar to those of a commercial disc brake pad produced by Knorr-Bremse AG (Germany). Additionally, the lowest linear wear loss of the obtained samples was (0.008 ± 0.001) mm per time per face, which is much lower than that of the Knorr-Bremse pad ((0.01 ± 0.001) mm). The excellent performance of the developed pad is a consequence of the formation of a dense oxide composite layer and its close combination with the pad body.     

超高分子量聚乙烯聚合材料的磨擦磨损性能

用MPV－200型磨擦磨损试验机和腐蚀磨损试验机,对MoS2、PTFE、石墨、玻璃纤维、碳纤维填充的超高分子量聚乙烯（UHMW－PE）塑料复合材料的磨擦磨损性能进行了较为系统的研究,结果表明：填充MoS2、PTFE、石墨可降低UHMW－PE的磨擦系数;而添加玻璃纤维则增大了UHMW－PE的磨擦系数;添加碳纤维对UHMW－PE的磨擦系数几乎无影响。同时,添加填料可使用UHMW－PE的耐磨性显著提高,其中石墨的减磨降磨效果最佳。重点研究了载荷、滑动速度对高分子量聚乙烯基体＋20％石墨复合材料的磨擦磨损性能的影响。     

Effect of Al<Subscript>2</Subscript>O<Subscript>3sf</Subscript> addition on the friction and wear properties of (SiC<Subscript>p</Subscript>+Al<Subscript>2</Subscript>O<Subscript>3sf</Subscript>)/Al2024 composites fabricated by pressure infiltration

Aluminum (Al) 2024 matrix composites reinforced with alumina short fibers (Al₂O_3sf) and silicon carbide particles (SiC_p) as wear-resistant materials were prepared by pressure infiltration in this study. Further, the effect of Al₂O_3sf on the friction and wear properties of the as-synthesized composites was systematically investigated, and the relationship between volume fraction and wear mechanism was discussed. The results showed that the addition of Al₂O_3sf, characterized by the ratio of Al₂O_3sf to SiC_p, significantly affected the properties of the composites and resulted in changes in wear mechanisms. When the volume ratio of Al₂O_3sf to SiC_p was increased from 0 to 1, the rate of wear mass loss (K_m) and coefficients of friction (COFs) of the composites decreased, and the wear mechanisms were abrasive wear and furrow wear. When the volume ratio was increased from 1 to 3, the COF decreased continuously; however, the K_m increased rapidly and the wear mechanism became adhesive wear.     

尼龙-6／纳米粒子复合材料制备及其性能研究

利用原位聚合方法制备了尼龙-6／纳米SiO2、尼龙6／纳米TiO2及尼龙6／碳纳米管复合材料;对复合材料的力学性能、软化温度进行测试,并对复合材料进行了IR分析;探讨了改性纳米粒子对复合材料力学性能的影响．结果表明：经钛酸酯偶联剂表面处理的纳米TiO2、经硅烷偶联剂处理的纳米SiO2及混酸处理的碳纳米管都可以在一定程度上提高尼龙6基体的拉伸强度和冲击强度;当复合材料中纳米SiO2质量分数为3％,或纳米TiO2质量分数为3％,或碳纳米管质量分数为1％时,其复合材料有较好的力学性能．     

水润滑条件对UHMWPE复合材料的摩擦行为影响研究

为研究不同水润滑条件对超高分子量聚乙烯/橡胶复合材料摩擦过程的影响,通过高温混炼和热压成型制备不同橡胶填充不同UHMWPE复合材料.利用Mrh-3型环块摩擦实验机,通过控制变量法定量研究不同组分复合材料的摩擦磨损性能,从而优选出最终UHMWPE复合材料.针对选定材料研究3种水润滑工况对摩擦过程的影响,同时利用SEM分析磨损表面,从微观层面探究摩擦机理.实验结果表明,水润滑条件对UHMWPE复合材料摩擦磨损性能指标影响显著,对应的磨损机理迥异,润滑条件的改善可使磨合期变短,稳定磨损期变长.从微观和定量方面综合评估了舰艇水润滑轴承材料在不同水润滑条件下的磨损状况,可为工况规划与实际应用提供理论指导.     

Friction and Wear Behaviors of C/C-Si C Composites under Water Lubricated Conditions

C/C-SiC composites have the potentiality to be applied in shield pumps of nuclear reactors as the bearing material because of their low density, good mechanical properties and excellent tribological properties. The C/C-SiC composites are fabricated via reactive melt infiltration(RMI) using silicon liquid infiltrated in C/C matrix composites. Friction and wear behaviors of C/C-SiC composites under water lubricated conditions are investigated using the block-on-ring test at room temperature, and compared with those of the resin graphite which is used as the bearing material in shield pumps at present. In addition, friction and wear mechanisms of C/C-SiC composites under water lubricated conditions have been discussed. Results show that tensile strengths of C/C-SiC composites are 150-210 MPa, and compressive strengths are 403-536 MPa. Friction and wear behaviors of C/C-SiC composites are closely related to the load and the speed. The time to reach a stable friction status decreases with the increase of the speed. Though the friction coefficient of C/C-SiC composites under water lubricated conditions is slightly higher than that of graphite, the wear rate of C/C-SiC composites is much lower, which suggests that the C/C-SiC composites can sustain a longer life during operation.     

三维编织碳/环氧复合材料的摩擦学特性

为研究三维编织复合材料的摩擦学行为，采用RTM工艺制备了三维编织碳纤维增强环氧树脂复合材料，讨论了纤维体积比、纤维表面处理和润滑条件等因素对复合材料摩擦磨损性能的影响。结果表明，随着纤维含量的增加，复合材料的摩擦系数先降后升，在35％时有最小值；磨损率则一直下降。纤维表面处理使复合材料的磨损率降低，耐磨性提高，水润滑条件下复合材料的摩擦磨损性能远优于干摩擦条件下的性能。干摩擦条件下复合材料的磨损机制主要为黏着磨损，水润滑条件下则以磨粒磨损为主。