莫来石与碳纤维协同填充的聚四氟乙烯基复合材料及其摩擦学性能

发布时间：2018-11-25 19:07

【摘要】：为了提高聚四氟乙烯(PTFE)的摩擦学性能,采用机械混匀、带温预压及烧结等工艺制备了莫来石和碳纤维填充的PTFE基复合材料,并通过FTIR、XRD、万能材料试验机、洛氏硬度计、DSC及热机械分析分别表征了PTFE基复合材料的显微结构、力学性能和热学性能;然后,使用MRH-3型高速环块磨损试验机测定了复合材料的摩擦系数和磨损率,通过自制的硅油砂浆磨损装置测定了复合材料在不同温度下的耐砂浆磨损性能;最后,借助3D测量激光显微镜研究了复合材料摩擦面形貌,并分析了摩擦磨损机制。结果表明:莫来石和碳纤维在PTFE体系中起到填充增强作用,20wt%莫来石~(-1)0wt%碳纤维/PTFE复合材料的弹性模量由364 MPa增加至874 MPa;20wt%莫来石~(-1)0wt%碳纤维/PTFE复合材料的干摩擦系数较大,但其磨损率与纯PTFE相比降低了3个数量级以上,且此复合材料在水摩擦条件下仍能保持较好的摩擦系数和磨损率,摩擦系数为0.157,磨损率为7.40×10-6 mm3·N~(-1)·m~(-1);此外,20wt%莫来石~(-1)0wt%碳纤维/PTFE复合材料在较高温度下仍能表现出良好的耐砂浆磨损性能。所得结论表明改性得到的PTFE基复合材料的摩擦学性能显著提高,复合材料可用于有杆抽油井防偏磨。
[Abstract]:In order to improve the tribological properties of PTFE (PTFE), mullite and carbon fiber filled PTFE matrix composites were prepared by mechanical blending, temperature preloading and sintering, and the hardness tester Rockwell hardness tester was used to prepare mullite and carbon fiber filled PTFE matrix composites. The microstructure, mechanical properties and thermal properties of PTFE matrix composites were characterized by DSC and thermomechanical analysis, respectively. Then, the friction coefficient and wear rate of the composites were measured by MRH-3 high-speed ring wear tester, and the wear resistance of the composites at different temperatures was measured by the self-made silicon oil mortar wear device. Finally, the friction surface morphology of the composites was studied by 3D laser microscope, and the friction and wear mechanism was analyzed. The results show that mullite and carbon fiber play a filling and strengthening role in PTFE system, and the elastic modulus of 20wt% mullite% carbon fiber / PTFE composites increases from 364 MPa to 874 MPa;. The dry friction coefficient of 20wt% mullite% carbon fiber / PTFE composites is larger, but the wear rate of 20wt% mullite / PTFE composites is more than 3 orders of magnitude lower than that of pure PTFE. The friction coefficient and wear rate of the composite are 0.157 and 7.40 脳 10 ~ (-6) mm3 N ~ (-1) m ~ (-1), respectively, and the friction coefficient is 0.157 and the wear rate is 7.40 脳 10 ~ (-6) mm3 N ~ (-1) m ~ (-1). In addition, 20wt% mullite ~ (-1) 0wt% carbon fiber / PTFE composites can still exhibit good wear resistance at higher temperatures. The results show that the tribological properties of the modified PTFE matrix composites are significantly improved, and the composites can be used to prevent deviation wear in rod pumping wells.
【作者单位】：扬州大学化学化工学院;
【分类号】：TH117;;TQ325

【相似文献】