碳纤维-AlN/聚醚醚酮复合材料的制备与性能

以聚醚醚酮(PEEK)为基体树脂、碳纤维(CF)和氮化铝(AlN)为填料,通过模压成型的方法制备了抗静电耐热型CF-AlN/PEEK复合材料。采用高阻计、导热系数测定仪、热失重、差示扫描量热仪和SEM研究了CF-AlN/PEEK复合材料的抗静电性能、热性能、力学性能以及降温速率对复合材料性能的影响,并探讨了后期热处理对力学性能的影响。结果表明:当CF和AlN的质量分数均为10%时,CF-AlN/PEEK复合材料的性能较优,其表面电阻率达到108 Ω,比PEEK的表面电阻率提高了6个数量级;导热系数为0.418 W·(m·K)-1,初始分解温度高达573℃;拉伸强度提高了40.4%;降温速率越低,复合材料的熔点越高;后期热处理会影响CF-AlN/PEEK复合材料的力学性能,在270℃下热处理2 h,其拉伸强度可达146 MPa,表明在生产过程中,加工温度是影响复合材料性能的因素之一。 

Preparation and properties of carbon fiber-AlN/poly ether ether ketone composites

The antistatic and heat-resistant carbon fiber(CF)-aluminum nitride(AlN)/poly ether ether ketone(PEEK) composites were prepared by compression molding, in which PEEK was used as matrix resin, CF and AlN were used as fillers. The antistatic, thermal and mechanical properties of CF-AlN/PEEK composites were characterized by high resistance meter, thermal conductivity instrument, thermo-gravimetric, differential scanning calorimetry and SEM. The effect of cooling rate on properties of composites and the effect of heat post-treatment on mechanical properties were also discussed. The results show that CF-AlN/PEEK composites have better properties when the mass fractions of CF and AlN are both 10% and surface resistivity is 10⁸ Ω which improves 6 magnitude than that of PEEK. The thermal conductivity coefficient and initial decomposition temperature are 0.418 W·(m·K)^-1 and 573℃ respectively.The tensile strength increases by 40.4%. The lower the cooling rate is, the higher the melting point of composites have. Heat post-treatment could affect mechanical properties of CF-AlN/PEEK composites. Tensile strength can reach 146 MPa at 270℃ after heat treating 2 h, which indicates that processing temperature is one of the factors that influences properties of composite in process of production.