Wetting of substoichiometric YSZ2-x by molten Sn-based active alloys at 800-900?

The wetting of Sn-8Zr, Sn-4Zr-4Ti, and Sn-8Ti on a substoichiometric YSZ(2-x) (yttria-stabilized substoichiometric zirconia) substrate was studied using a modified sessile drop method at 800-900 degrees C. The Sn-4Zr-4Ti/YSZ(2-x) system had the best final wettability (approximately 32 degrees, 27 degrees, and 22 degrees at 800, 850, and 900 degrees C, respectively), satisfying the brazing wetting requirements. When Zr-containing alloys contacted the YSZ(2-x) substrate, the decomposition of YSZ(2-x) induced the formation of Sn2Zr and more non-metallic YSZ(2-y.) The final wettability was determined using Sn2Zr, YSZ(2-y), and the adsorption of Zr (and/or Ti). Titanium in the Sn-8Ti/YSZ2-x system inhibited the massive decomposition of YSZ(2-x), maintained the original metallicity, and, together with the adsorption of Ti, contributed to the final wettability. A scalar law analysis indicated that the wetting activation energies of the Sn-4Zr-4Ti/YSZ(2-x) and Sn-8Ti/YSZ(2-x) systems were 197 and 243 kJ/mol, corresponding to the formation of Sn-Zr and Ti-Zr chemical bonds during the liquid-solid interface formation, respectively.

Automated summary

The wetting behavior of Sn-8Zr, Sn-4Zr-4Ti, and Sn-8Ti on a substoichiometric YSZ(2-x) substrate was studied, with the Sn-4Zr-4Ti/YSZ(2-x) system showing the best final wettability.