Abstract To explore the effect of the pore structure of paper-based friction materials on the friction and wear properties, the composites with different pore structures were obtained using physical foaming technology. Results displayed that the bulk density and average pore size of composites increased after the foaming treatment, while the total pore area and porosity showed a tendency to gradually decrease after hot pressing. The tensile and interlaminar shear strength of the composites were improved by 18% and 42% respectively after the optimization of the pore structure. Moreover, the application of foaming technology significantly increased dynamic friction coefficient and reduced wear rate of the friction materials. In particular, the wear rate of paper-based friction materials decreased by 44.6% from 1.57x10−8 cm3/J to 0.87x10−8 cm3/J with the increase of foaming agent content. Most importantly, the pore structure of paper-based friction materials can be effectively changed due to the introduction of physical foaming technology. This research lays a solid foundation for optimizing the pore structure of paper-based friction materials in the future.

中文翻译：

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孔结构对纸基摩擦材料力学和摩擦学性能的影响

摘要 为探讨纸基摩擦材料孔隙结构对摩擦磨损性能的影响，采用物理发泡技术制备了不同孔隙结构的复合材料。结果表明，发泡处理后复合材料的堆积密度和平均孔径增大，而热压后总孔面积和孔隙率呈逐渐减小的趋势。孔结构优化后复合材料的拉伸强度和层间剪切强度分别提高了18%和42%。此外，发泡技术的应用显着提高了动摩擦系数，降低了摩擦材料的磨损率。特别是，纸基摩擦材料的磨损率从 1.57x10−8 cm3/J 下降了 44.6% 到 0。87x10−8 cm3/J 随着发泡剂含量的增加。最重要的是，由于物理发泡技术的引入，可以有效改变纸基摩擦材料的孔隙结构。该研究为今后优化纸基摩擦材料的孔结构奠定了坚实的基础。