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A study of titanium thin films in transmission laser micro-joining of titanium-coated glass to polyimide |
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| Authors: | Taslema Sultana Golam Newaz Grigor L Georgiev Gregory W Auner Rahul Patwa |
| Affiliation: | a Institute for Manufacturing Research, Wayne State University, 555 Hancock Ave, Detroit, MI 48202, USA b Department of Mechanical Engineering, Wayne State University, 5050 Anthony Wayne Dr., Detroit, MI 48202, USA c Department of Electrical and Computer Engineering, Wayne State University, 5050 Anthony Wayne Dr., Detroit, MI 48202, USA d Fraunhofer Center for Laser Technology, 46025 Port Street, Plymouth, MI 48170, USA |
| Abstract: | Electron beam evaporation (EB-PVD) and cathodic arc physical vapor deposition (CA-PVD) techniques were used for the preparation of titanium (Ti) thin films onto Pyrex borosilicate 7740 glass wafers and the deposited films were characterized by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) techniques. The microstructure and surface morphology of the films were studied as a function of the film deposition techniques. Film properties such as, adherence, microstructure and roughness were interconnected to the laser joint strength between Ti coated glass wafers and polyimide films. Ti thin films on glass had a natural oxide layer on the surface as found from XPS. AFM study showed the formation of a uniform Ti coating consisted of packed crystallites with average size of 35 nm by EB-PVD. The root-mean-square surface roughness of the films was 1-2 nm. Whereas, films prepared by CA-PVD had crystallites with an average size of 120 nm and defects in the form of macro-particles which is a common attribute of this deposition system. The surface roughness of the film was 125 nm. The laser joint strength was found to be influenced by the Ti film quality on the glass substrate. |
| Keywords: | Titanium Thin films Electron beam evaporation Cathodic arc physical vapor deposition Transmission laser joining Atomic force microscopy X-ray photoelectron spectroscopy |
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