Ye Yiyun, Zou Qi, Xiao Yinan, Jiao Junke, Du Beining, Liu Yuezhan, Sheng Liyuan
School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo 315201, China.
Micromachines (Basel). 2021 Feb 11;12(2):179. doi: 10.3390/mi12020179.
In the present research, the carbon fiber reinforced thermoplastic (CFRTP) was laser joined with the Al alloy whose joining interface was pretreated by laser micro-texturing, anodizing, and hybrid of laser micro-texturing and anodizing. The surface morphology of the pretreated Al joining interface and bonding strength of the corresponding Al/CFRTP butt joint were investigated. The results show that the laser micro-texturing has fabricated the micro-pit or micro-furrow in the Al joining interface. With the increasing of laser scanning times, the size of the micro-pit or micro-furrow decreases, when the laser scanning distance is constant. The bonding strength of the Al/CFRTP butt joint with Al joining interface pretreated by micro-texturing fluctuates with the increasing of laser scanning distance and times, reaching the maximum value of 20 MPa at laser scanning distance of 0.1 mm and 1 time. The anodizing pretreatment has formed the AlO oxide layer on the Al joining interface. The Al/CFRTP butt joint with Al joining interface pretreated by anodizing obtains the maximum bonding strength of 11 MPa at anodizing time of 10 min. The hybrid pretreatment of micro-texturing and subsequent anodizing fabricates the regular grid structure with smooth micro-furrow and micro-pit, while the hybrid pretreatment of anodizing and subsequent micro-texturing fabricates the Al joining interface with explosive micro-pit and micro-furrow. The bonding strength of the Al/CFRTP butt joint with hybrid-pretreated Al joining interface is relative better than that of the Al/CFRTP butt joint with anodizing-pretreated Al joining interface but almost lower than that of the Al/CFRTP butt joint with micro-texturing pretreated Al joining interface. Such results should be attributed to the surface morphology of the Al joining interface.
在本研究中，将碳纤维增强热塑性塑料（CFRTP）与铝合金进行激光连接，铝合金的连接界面经过激光微织构化、阳极氧化以及激光微织构化与阳极氧化的复合处理。研究了预处理后的铝合金连接界面的表面形貌以及相应的铝/碳纤维增强热塑性塑料对接接头的结合强度。结果表明，激光微织构化在铝合金连接界面上制造出了微坑或微槽。当激光扫描距离恒定时，随着激光扫描次数的增加，微坑或微槽的尺寸减小。经过微织构化预处理的铝/碳纤维增强热塑性塑料对接接头的结合强度随激光扫描距离和次数的增加而波动，在激光扫描距离为0.1mm且扫描1次时达到最大值20MPa。阳极氧化预处理在铝合金连接界面上形成了AlO氧化层。经过阳极氧化预处理的铝/碳纤维增强热塑性塑料对接接头在阳极氧化时间为10min时获得最大结合强度11MPa。微织构化与后续阳极氧化的复合预处理制造出了具有光滑微槽和微坑的规则网格结构，而阳极氧化与后续微织构化的复合预处理制造出了具有爆裂状微坑和微槽的铝合金连接界面。经过复合预处理的铝合金连接界面的铝/碳纤维增强热塑性塑料对接接头的结合强度相对优于经过阳极氧化预处理的铝/碳纤维增强热塑性塑料对接接头，但几乎低于经过微织构化预处理的铝/碳纤维增强热塑性塑料对接接头。这些结果应归因于铝合金连接界面的表面形貌。
