期刊
MICROMACHINES
卷 12, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/mi12020179
关键词
laser joining; CFRTP; micro-texturing; dissimilar joint; anodizing; bonding strength
类别
资金
- Natural Science Foundation of Guangdong Province, China [2020A151501305, 2018A030313950]
- Shenzhen Basic Research Project [JCYJ20200109144604020, JCYJ20200109144608205]
- Youth Innovation Promotion Association Chinese Academy of Sciences [2017343]
- Zhejiang Provincial Natural Science Foundation of China [LY18E050027]
In this research, laser micro-texturing, anodizing, and hybrid pretreatment methods were used for Al/CFRTP butt joint. Laser micro-texturing created micro-pits or micro-furrows, anodizing formed Al2O3 oxide layer, and hybrid pretreatment fabricated a regular grid structure. The maximum bonding strengths were achieved at 20 MPa for micro-texturing, 11 MPa for anodizing, and the hybrid pretreatment showed relative better bonding strength.
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 Al2O3 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.
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