Li Pin, Li Jing, Tan Wensheng, Liu Huixia, Wang Xiao
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200000, China.
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China.
Materials (Basel). 2018 Aug 23;11(9):1513. doi: 10.3390/ma11091513.
To address the difficulty of joining polystyrene (PS) and titanium by laser transmission joining, two methods-laser treatment of the titanium surface and oxygen plasma treatment of the PS surface-are used to compare the laser transmission joint strengths of the different treatment methods. The results of the experiments find that joining with titanium can be achieved only when PS is treated with oxygen plasma. When the laser-treated surface of titanium is jointed to the oxygen plasma-treated PS, the joint strength is the highest, reaching 6.5 MPa. The joining mechanism of oxygen plasma-treated PS and laser oxidation-treated titanium was investigated by joint tensile failure mode, joint micromorphology observation, contact angle and surface free energy experiments, and X-ray photoelectron spectroscopy (XPS). The results show that the failure mode of the joint is an interfacial failure; the size and amount of bubbles play an important role in the joining strength, and the joints with fine and uniform bubbles have the highest joint strength. The two surface treatment methods can improve the surface energy of the joints, improve the compatibility between the two joining surfaces, and enhance the joint strength. Ti⁻C and Ti⁻O chemical bonds are formed at the joints, which are the main reason for the increase in joint strength.
为了解决通过激光透射连接法连接聚苯乙烯（PS）和钛的困难，采用了两种方法——对钛表面进行激光处理以及对PS表面进行氧等离子体处理——来比较不同处理方法的激光透射连接强度。实验结果发现，只有当PS经过氧等离子体处理时，才能实现与钛的连接。当钛的激光处理表面与氧等离子体处理的PS连接时，连接强度最高，达到6.5兆帕。通过接头拉伸失效模式、接头微观形貌观察、接触角和表面自由能实验以及X射线光电子能谱（XPS）研究了氧等离子体处理的PS与激光氧化处理的钛的连接机制。结果表明，接头的失效模式为界面失效；气泡的大小和数量对连接强度起着重要作用，气泡细小且均匀的接头具有最高的连接强度。两种表面处理方法均可提高接头的表面能，改善两个连接表面之间的相容性，并增强连接强度。接头处形成了Ti⁻C和Ti⁻O化学键，这是连接强度增加的主要原因。
