Wetting behavior and reactivity between liquid Gd and ZrO2 substrate

P. Turalska, M. Homa, G. Bruzda, N. Sobczak, Ivan Kaban, Norbert Mattern, Jürgen Eckert

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The wetting behavior and reactivity between molten pure Gd and polycrystalline 3YSZ substrate (ZrO2 stabilized with 3
wt% of Y2O3) were experimentally determined by a sessile drop method using a classical contact heating coupled with drop
pushing procedure. The test was performed under an inert flowing gas atmosphere (Ar) at two temperatures of 1362 °C and
1412 °C. Immediately after melting (Tm=1341 °C), liquid Gd did not wet the substrate forming a contact angle of θ=141°.
The non-wetting to wetting transition (θ < 90°) took place after about 110 seconds of interaction and was accompanied by
a sudden decrease in the contact angle value to 67°. Further heating of the couple to 1412 °C did not affect wetting
The solidified Gd/3YSZ couple was studied by means of optical microscopy and scanning electron microscopy coupled
with X-ray energy dispersive spectroscopy. Structural investigations revealed that the wettability in the Gd/3YSZ system is
of a reactive nature associated with the formation of a continuous layer of a wettable reaction product Gd2Zr2O7
Original languageEnglish
Pages (from-to)285-293
Number of pages9
JournalJournal of Mining and Metallurgy, Section B: Metallurgy
Issue number3
Publication statusPublished - 13 Nov 2017

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