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

Abstract

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.

Interfacial and Transport Phenomena between Liquid Metal and Solid Structural Materials

“…The next paper described the result of the experimental studies that were conducted on practical implementation of the high-temperature capillarity phenomena, namely, ones involving a reactive wetting and reactive melt infiltration. In this topic, Zhang et al [ 4 ] described pioneering findings on the interaction between Sn-V active solders and porous graphite at a temperature range of 650–950 °C. It was shown that even a very small addition of vanadium (0.5 wt %) to tin strongly improved the wetting, while a further increase of its content (up to 7 wt %) only slightly affected the contact angle values.…”

Investigation of Vanadium-Containing Sludge Oxidation Roasting Process for Vanadium Extraction

“…Vanadium is one of the most important strategic metals widely used in various industries such as metallurgy, chemical, aerospace, medicine, etc. [1][2][3][4][5][6][7][8][9][10]. The main raw materials for vanadium extraction are titanomagnetite ores [11][12][13][14][15].…”