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research-article

Effects of Laser Radiation on the Wetting and Diffusion Characteristics of Kovar Alloy on Borosilicate Glass

[+] Author and Article Information
Min Zhang

ASME Member Laser Processing Research Center, School of Mechanical and Electrical Engineering, Soochow University, Suzhou, Jiangsu 215021, China
mzhang@aliyun.com

Y. Lawrence Yao

ASME Fellow Advanced Manufacturing Laboratory, Department of Mechanical Engineering, Columbia University, New York, NY 10027
yly1@columbia.edu

Changjun Chen

ASME Member Laser Processing Research Center, School of Mechanical and Electrical Engineering, Soochow University, Suzhou, Jiangsu 215021, China
chjchen2001@aliyun.com

Panjawat Kongsuwan

ASME Member Advanced Manufacturing Laboratory, Department of Mechanical Engineering, Columbia University, New York, NY 10027
panjawat.kon@mtec.or.th

Grant Brandal

ASME Member Advanced Manufacturing Laboratory, Department of Mechanical Engineering, Columbia University, New York, NY 10027
gbb2114@columbia.edu

Dakai Bian

ASME Member Advanced Manufacturing Laboratory, Department of Mechanical Engineering, Columbia University, New York, NY 10027
db2875@columbia.edu

1Corresponding author.

ASME doi:10.1115/1.4037426 History: Received March 05, 2017; Revised June 21, 2017

Abstract

The advantages of laser surface melting for improving wetting over the traditional approach was studied. Kovar alloy was preoxidized in atmosphere at 700? for 10min and wetted with borosilicate glass powder at 1100? with different holding time in atmosphere. A Nd:YAG laser was used to melt the surface of the kovar alloy in atmosphere, then wetted with borosilicate glass powder at 1100? with the same holding time. The laser melted surface shows a decrease in contact angle from 47.5 degrees to 38 degrees after 100 minutes. XPS analysis shows that the surface and adjacent depth have higher concentration of FeO for laser treated kovar (Kovar(L)) than that on traditional thermal treated kovar (kovar(P)). This is attributed to the following improved wetting and diffusion process. The adhesive oxide layer formed on kovar (L) may enhance the oxygen diffusion into the substrate and iron diffusion outwards to form an outside layer. This is an another way to enhance the wetting and diffusion process when compared to the delaminated oxide scales formed on kovar (P) surface. The diffusion mechanisms were discussed for both approaches. An iron oxide interlayer in the joint existed under both conditions. Fayalite nucleated on the iron oxide layer alloy and grew into the glass. In both cases, neither Co nor Ni were involved in the chemical bonding during wetting process. The work has shown that laser surface melting can be used to alter the wetting and diffusion characteristics of kovar alloy onto borosilicate glass.

Copyright (c) 2017 by ASME
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