NDLI: Modeling the diffusion-driven growth of a pre-existing gas bubble in molten tin

Content Provider	Springer Nature Link
Author	Kunwar, Anil Ma, Haitao Sun, Junhao Li, Shuang Liu, Jiahui
Copyright Year	2015
Abstract	Finite element method is utilized to solve the diffusion equation and model the diffusion driven growth of a pre-existing spherical gas bubble in molten tin at the solder/substrate interface for reflow time of 120 s and temperature of 250 °C. The gibbs free energy change required for determining the equilibrium concentration at liquid solder/gas bubble boundary was calculated using the thermodynamic polynomial coefficients. The rate of change of radius, as function of concentration flux, is calculated using the lagrangian mesh update methodology. With an initial diameter of 20 μm, the bubble growth is calculated as a function of contact angle. When the wetting angle is varied from a value of 30° to 135°, the numerical calculation has yielded the final sizes for the bubble to change from 62.87 μm to 82.8 μm respectively. The effect of wetting transition in the growth of bubble was studied by the in-situ observation of bubble dynamics through synchrotron radiation imaging technique. The scanning electron microscopy images of the morphologies of intermetallic compounds influenced by growing bubble in Sn/Cu solder joint and bubble pictures obtained through synchrotron radiation are utilized to get the experimental size of the bubble. The mean experimental bubble diameter has been obtained as 76.39 μm. The growing bubble inhibits the growth of intermetallic compound at its vicinity and thereby reduces the strength of solder joints.
Starting Page	962
Ending Page	970
Page Count	9
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	21
Issue Number	5
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2015-08-18
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	bubble metals soldering diffusion synchrotron radiation Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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Erratum to: Modeling the diffusion-driven growth of a pre-existing gas bubble in molten tin

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