导热填料对EP／SiC／CF复合材料摩擦层热性能的影响

摘要

In order to improve the braking performance of competitive bicycle,firstly, the modified resin was prepared by mixing the epoxy resin(EP) and silicon carbide(SiC), and the frictional layer sample of EP/SiC/carbon fiber (CF) composite for the braking part of bicycle wheel was made by immersion and mould pressing methods,and the influence of heat conduction filler on the thermal performance of the composite frictional layer sample was studied by using the thermal conductivity testing device made byself,also the thickness of frictional layer was optimized. The results show that the surface temperature of frictional layer sample gradually increases and reaches the balance with the time increasing, the equilibrium temperature of the composite frictional layer increases with the content of heat conduction filler in the modified resin increasing and the decrease of heating rate speed up. The thermal conductivity of the composite frictional layer on high temperature condition increases with the content of filler increasing, and the specific value of heat rising time and thickness is different with the thickness. Overall consideration,the 0.5 mm thickness composite frictional layer of bicycle wheel with 6%filler in the modified resin is suitable for the manufacture of braking structure of composite bicycle wheel.%为了提高竞技用自行车的制动性能，先将环氧树脂(EP)和碳化硅混合制备了改性树脂，利用浸渍-模压法制备了一种用于自行车轮圈刹车部位的EP/SiC/碳纤维(CF)复合材料摩擦层样品，利用自制的热导率测试装置研究了导热填料的含量对摩擦层样品的热性能影响，并且对摩擦层样品的厚度规格参数进行了优化。结果表明，摩擦层样品随着时间的增加，表面温度逐渐升高达到平衡；随着改性树脂中导热填料的含量增加，摩擦层样品平衡温度升高，且升温速率下降加快；摩擦层样品的高温热导率随着填料含量的增加而增大，不同厚度摩擦层样品的定值升温时间/厚度的比值不同。综合考虑，改性树脂中导热填料质量分数为6%、厚度为0.5 mm的复合材料摩擦层适用于复合材料自行车轮圈的刹车结构。