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Effects Of Laser Parameters On The Mechanical Response Of Laser Irradiated Micro-Joints

Published online by Cambridge University Press:  01 February 2011

Ahsan Mian ,
Tonfiz Mahmood ,
Greg Auner ,
Reiner Witte ,
Hans Herfurth  and
Golam Newaz
Ahsan Mian
Affiliation:
[email protected], Montana State University, Mechanical and Industrial Eng., 220 Roberts Hall, Bozeman, MT, 59717, United States, 406-994-6296, 406-994-6292
Tonfiz Mahmood
Affiliation:
[email protected], Wayne State University, Mechanical Engineering, Detroit, MI, 48202, United States
Greg Auner
Affiliation:
[email protected], Wayne State University, Electrical and Computer Engineering, Detroit, MI, 48202, United States
Reiner Witte
Affiliation:
[email protected], Fraunhofer USA, Center for Laser Technology, Plymouth, MI, 48170, United States
Hans Herfurth
Affiliation:
[email protected], Fraunhofer USA, Center for Laser Technology, Plymouth, MI, 48170, United States
Golam Newaz
Affiliation:
[email protected], Wayne State University, Mechanical Engineering, Detroit, MI, 48202, United States
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Abstract

This paper is devoted to the laser irradiated joints between glass and polyimide. To facilitate bonding between them, a thin titanium film with a thickness of approximately 0.2 μm was deposited on glass wafers using the physical vapor deposition (PVD) process. Two sets of samples were fabricated where the bonds were created using diode and fiber lasers. The samples were subjected to tension using a microtester for bond strength measurements. The failure strengths of the bonds generated using fiber laser are quite consistent, while a wide variation of failure strengths are observed for the bonds generated with diode laser. Few untested samples were sectioned and the microstructures near the bond areas were studied using an optical microscope. The images revealed the presence of a sharp crack in the glass substrate near the bond generated with the diode laser. However, no such crack was observed in the samples made using fiber laser. To investigate further the reasons behind such discrepancy in bond quality, three-dimensional uncoupled finite element analysis (FEA) was conducted for both types of samples. The transient heat diffusion-based FEA model utilizes the laser power intensity distribution as a time dependent heat source to calculate the temperature distribution within the substrates as a function of time.

Keywords

biomedicallaserbonding
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 926: Symposium CC – Electrobiological Interfaces on Soft Substrates , 2006 , 0926-CC08-04
Copyright
Copyright © Materials Research Society 2006

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