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Reactive Infiltration and Microstructural Characteristics of Sn-V Active Solder Alloys on Porous Graphite

1
Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China
2
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730000, China
3
School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia
*
Author to whom correspondence should be addressed.
Contributed equally.
Materials 2020, 13(7), 1532; https://doi.org/10.3390/ma13071532 (registering DOI)
Received: 3 March 2020 / Revised: 15 March 2020 / Accepted: 18 March 2020 / Published: 27 March 2020
In this work, the reactive wetting and infiltration behaviors of a newly designed Sn-V binary alloy were comprehensively explored on porous graphite for the first time. It was discovered that 0.5 wt.% addition of V can obviously improve the wettability of liquid Sn on porous graphite and the nominal V contents in Sn-V binary alloys has minor effects on the apparent contact angles wetted at 950 °C. Moreover, the V-containing Sn-V alloys were initiated to spread on porous graphite at ~650 °C and reached a quasi-equilibrium state at ~900 °C. Spreading kinetics of Sn-3V alloy on porous graphite well fitted in the classic product reaction controlled (PRC) model. However, our microstructural characterization demonstrated that, besides vanadium carbide formation, the adsorption of V element at the wetting three-phase contact line spontaneously contributed to the reactive spreading and infiltrating of Sn-V alloys on porous graphite. Meanwhile, the formation of continuous vanadium carbides could completely block the infiltration of Sn-V active solder alloy in porous graphite. Affected by the growth kinetics of vanadium carbides, the infiltration depth of Sn-V alloys in porous graphite decreased at increased isothermal wetting temperatures. This work is believed to provide implicative notions on the fabrication of graphite related materials and devices using novel V-containing bonding alloys. View Full-Text
Keywords: reactive wetting; infiltration; mass transfer; porous graphite; Sn-V alloy reactive wetting; infiltration; mass transfer; porous graphite; Sn-V alloy
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MDPI and ACS Style

Zhang, Y.; Liao, X.; Lin, Q.; Mu, D.; Lu, J.; Huang, H.; Huang, H. Reactive Infiltration and Microstructural Characteristics of Sn-V Active Solder Alloys on Porous Graphite. Materials 2020, 13, 1532.

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