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ABSTRACT
Asbestos fiber usage as reinforcement in friction material composites is avoided because of its carcinogenic property that might cause cancer. The aim of this study is to investigate the thermal characteristics of the novel noncommercial brake pad materials, i.e., flax fiber reinforced phenolic resin composites (FRPCs) and basalt fiber reinforced phenolic resin composites (BRPCs). FRPCs and BRPCs with different volume percentages of 2, 4, 6, and 8 of chemically treated flax and basalt fiber are fabricated by diffusion bonding technique. The thermal behavior was investigated by the use of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. DSC results revealed that FRPC and BRPC samples reinforced with 6% volume fraction (Vf) of the respective fibers are having better thermal stability than other volume percentage, since the glass transition temperature (Tg) is relatively high. TGA analysis also shows that FRPC and BRPC specimens reinforced with 6% Vf of flax and basalt fibers have good thermal stability when compared to other volume fractions. The weight loss observed for 6% Vf of FRPC and BRPC is less compared to other specimens with increase in temperature. Scanning electron microscopy photography is used to analyze the orientation and bonding structure of matrix and fibers.
摘要
石棉纤维具有致癌、致癌的特性，可避免在摩擦材料复合材料中用作增强材料.研究了亚麻纤维增强酚醛树脂（FRPC）和玄武岩纤维增强酚醛树脂（BRPC）两种新型非商用刹车片材料的热性能.采用扩散键合技术制备了纤维体积分数分别为2%、4%、6%和8%的化学处理亚麻纤维和玄武岩纤维的FRPC和BRPC.采用差示扫描量热法（DSC）和热重分析（TGA）研究了其热行为.差示扫描量热分析（DSC）结果表明，纤维体积分数为6%的纤维增强FRPC和BRPC的玻璃化转变温度较高，热稳定性优于其它体积分数的纤维.TGA分析还表明，用6%Vf亚麻和玄武岩纤维增强的FRPC和BRPC试样与其它体积分数相比具有良好的热稳定性.随着温度的升高，6%Vf的FRPC和BRPC复合材料的失重率比其他试样小.利用扫描电镜（SEM）照片分析了基体和纤维的取向和结合结构.