激光处理对CFRP与铝胶接性能的研究

碳纤维增强复合材料(CFRP)具有轻质高强的特点,被广泛应用于汽车、航空航天、建筑等领域。但CFRP表面惰性高,使得CFRP与其他异质材料复合时的胶接强度低,不能满足使用。采用激光(光纤激光器)对CFRP进行表面处理后,再与铝进行胶接测试。利用SEM、接触角测试和光学轮廓仪测试对不同脉宽的激光处理后的CFRP表面形貌、表面能、表面粗糙度进行研究。结果表明,随脉宽增加,处理后的CFRP表面树脂残留量减少,表面粗糙度增加,表面自由能也相应增加。对比激光处理与机械打磨两种方式与铝的胶接性能发现,激光处理的CFRP与铝的胶接强度比未处理提高了1.95倍,比打磨处理提高了1.02倍。对其胶接断面进行分析可知,激光处理试样的断裂模式主要为纤维撕裂破坏。

EFFECT OF LASER TREATMENT ON PROPERTIES OF CFRP/ALUMINUM ADHESIVE

Carbon fiber reinforced polymers (CFRP) have been receiving much interest in motivation and aviation fields due to their outstanding properties including lightweight and high strength.However,bonding strength of CFRP between composites and other materials needs to be enhanced because of the strong surface inertia and weak bonding strength.CFRP was treated by lasers with different pulse widths.The modified surface and cementation section of CFRP were characterized by SEM,contact angle test and surface roughness analysis.The results show that the amount of residual resin on CFRP surface decreased with increasing of pulse width,while the surface energy and surface roughness increased.The efficiency of the laser treatment method has been compared with mechanical grinding method through bonding strength and fiber cross section analysis.The bonding strength of CFRP and aluminum for laser treatment method improved 1.95 times and 1.02 times for mechanical grinding method in compassion with the untreated samples.At last,the bonding mechanism and failure mechanism of this dissimilar joint were investigated.