3.2. Thermal and mechanical perform

3.2。热力学性能<br>3.2.1。导热系数<br>由于<br>摩擦副与纸质摩擦<br>板之间的压力接触，在摩擦过程中会产生大量热量。如果热量没有及时传递到外部，<br>则摩擦材料的表面温度会迅速升高，从而损坏<br>摩擦材料。图10显示了不同<br>复合材料的热导率。可以得出结论，孔的尺寸和分布<br>以及材料的孔隙率对导热<br>率有影响。原因是孔中的孔的热导率<br>纸基摩擦材料的性能要比基体材料差，并且<br>材料内部的传热始终是在<br>阻力较小的方向上进行的。因此，当<br>孔隙率低时，孔壁的厚度增加，从而导热能力增强并且<br>材料的导热率增加。另外，当孔径小时，孔结构变得复杂，因此热<br>传递的路径相对复杂，从而增加了热<br>传递的难度并降低了热导率。

3.2. 热力和机械性能<br>3.2.1. 导热性<br>在摩擦过程中可以产生大量的热量<br>摩擦对与纸质摩擦之间的压力接触<br>板。如果热量不及时转移到外面，表面<br>摩擦材料的温度迅速上升，然后损坏<br>摩擦材料。图10 显示不同电导率<br>复合材料。可以得出结论，毛孔的大小和分布，<br>以及材料的孔隙度，对热有影响<br>电导 率。原因是毛孔的导热性<br>纸基摩擦材料比矩阵差，<br>材料内部的热传递始终朝着<br>阻力较小。因此，毛孔壁的厚度增加时，<br>孔隙度低，使热传导能力增强，<br>材料的导热性增加。此外，毛孔结构复杂时，孔径小，所以热路径<br>传输相对复杂，从而增加了热量的差异<br>转移和降低导热性。

3.2. Thermal and mechanical performance 3.2.1. Thermal conductivity A large amount of heat can be generated during the friction process due to the pressure contact between friction pair and paper-based friction plate. If the heat was not transferred to the outside timely, the surface temperature of the friction materials rises rapidly and then damage the friction materials. Fig. 10 shows the thermal conductivity of different composites. It can be concluded that the size and distribution of the pores, as well as the porosity of the materials, have an effect on the thermal conductivity. The reason is that the thermal conductivity of the pores in the paper-based friction materials is worse than that of the matrix, and the heat transfer inside the materials is always carried out in the direction of less resistance. Therefore, the thickness of the pore wall increases when the porosity is low, so that the ability of heat conduct enhanced and the thermal conductivity of materials increases. In addition, the pore structurebecomes complicated when the pore diameter is small, so the path of heat transfer is relatively complicated, thereby increasing the diffculty of heat transfer and reducing the thermal conductivity.<br>