Wetting behaviour and reactivity between liquid Gd and ZrO2 substrate
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...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700045T.pdf |
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| Summary: | 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 (θ=67°±1°). 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. |
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| ISSN: | 1450-5339 2217-7175 |