稀土元素表面处理玻璃纤维增强PTFE复合材料的拉伸性能

研究了用稀土元素 (RE)处理玻璃纤维表面的最佳用量及其对玻璃纤维增强聚四氟乙烯 (GF/PTFE)复合材料拉伸性能的影响。测试了不同表面处理条件下GF/PTFE复合材料的拉伸性能 ,并对断口形貌进行了SEM分析。结果表明 ,由于RE对亲和性的作用 ,RE能够有效地提高玻璃纤维与PTFE之间的界面结合力。当稀土元素在表面改性剂中的含量为 0 2 %～ 0 4%时 ,GF/PTFE复合材料的拉伸性能得到明显提高 ,并且在RE含量为 0

稀土元素对玻璃纤维增强PTFE复合材料拉伸性能的影响

三种表面改性剂，即硅烷偶联剂SG－Si900(SGS)、含SG－Si900的稀土溶液（SGS／RES）和稀土溶液（RES）用于玻璃纤维表面处理，研究了不同表面处理条件下玻璃纤维增强聚四氟乙烯（GF／PTFE）复合 拉伸性能，并应用SEM对断口形貌进行了分析，试验结果表明，由于稀土元素的作用，稀土溶液RES比SGS／RES和SGS能够更好地提高玻璃纤维与PTFE之间的界面结合力，经RES处理GF／PTFE复合材料的界面结合力主要受稀土元素含量的影响，当稀土元素含量为0．2－0．4wt%时，GF／PTFE复合材料的拉伸性能大大提高，并且在稀土元素含量为0.3wt%时其性能最佳。

Tensile Properties of Surface-Treated Glass Fiber Reinforced PTFE Composite with Rare Earth Elements

The optimum amount of rare earth elements (RE) for treating glass fiber surface and its effect on the tensile properties of glass fiber reinforced polytetrafluoroethylene (GF/PTFE) composites were investigated. The tensile properties of GF/PTFE composites with different surface treatment conditions were measured. The fracture surface morphologies were observed and analyzed by SEM. The results indicate that rare earth elements can effectively promote the interfacial adhesion between the glass fiber and PTFE, owing to the effects of rare earth elements on the compatibility. The tensile properties of GF/PTFE composites can be improved considerably when the content of RE in surface modifier is 0.2%～0 4%, and the optimum performance of GF/PTFE composites is obtained at 0.3%RE content.

混杂填料增强PTFE复合材料的摩擦磨损性能

利用M-2000型摩擦磨损试验机考察了载荷以及纳米TiO2/SiO2与玻璃纤维的混合填料对PTFE复合材料摩擦磨损性能的影响,用扫描电子显微镜观察了复合材料磨损后的表面形貌。结果表明：纳米材料与玻璃纤维的协同作用显著改善了材料的摩擦磨损性能,其中纳米TiO2与玻纤填充复合材料的耐磨性较好,磨损量降低了2-3个数量级,其磨损机制是低载荷下为磨粒磨损,高载荷下为疲劳磨损;纳米SiO2与玻纤填充复合材料的摩擦系数与PTFE相近,磨损机制是低载荷下为磨粒磨损,高载荷下为粘着磨损和表面微犁削磨损。

增强耐磨改性尼龙6的研制

本文研究了PA6/PTFE/GF共混体系性能与组成比的关系.讨论了PTFE的品级,GF的种类及共混工艺对共混物性能的影响.通过用Cr及PTFE填充改性,使改性尼龙6的力学性能和耐磨性均得到有效的改善.该共混物材料的性能指标接近国外同类产品的水平.

玻璃纤维/聚四氟乙烯复合材料的制备与性能研究

通过高速混合、冷压烧结成型法用玻璃纤维(GF)填充聚四氟乙烯(PTFE)制备了GF/PTFE复合材料,探讨了GF用量对GF/PTFE复合材料拉伸性能和摩擦磨损性能的影响,用扫描电子显微镜(SEM)对复合材料微观结构进行了分析研究。结果表明:GF质量分数为15%时,复合材料耐磨性能最好,磨耗量不足1.0×10-3g/h,拉伸强度与常规干法混合制备的复合材料相比提高近30%,高速混合工艺使GF均匀分布于PTFE基体中,并可进一步细化PTFE粉料。

Tribological Properties of Polytetrafluoroethylene Composites Filled with Rare Earths Modified Glass Fibers

Rare earths were used to modify the surface of glass fiber in order to enhance the interfacial adhesion and improve the tribolngical properties of GF / PTFE composites . Three surface modifiers, a coupling agent, rare earths, and a mixture of coupling agent and rare earths, were investigated. It is found that the tensile properties of rare earths modified GF / PTFE composites were improved considerably under the same experimental conditions. The PTFE composites, filled with rare earths modified glass fibers, exhibited the lowest friction coefficient and the highest wear resistance under both dry friction and oil-dropped lubrication conditions. In addition, rare earths modified GF/ PTFE composites showed the highest wear resistance under reciprocating impact load. The worn surfaces observation shows that rare earth elements modifier are superior to coupling agent modifier and the mixture of coupling agent and rare earths in promoting interfacial adhesion between the glass fiber and PTFE, accordingly improve tribological properties of GF / TFE composites due to their outstanding chemical activity.