Behavior of yttria-stabilized zirconia in the presence of molten salts: Part 1 - Dissolution and recrystallization phenomena

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• 作者：Dirk Mü ; ller ; ^{dirk.mueller@min.uni-muenchen.de" class="auth_mail" title="E-mail the corresponding author} ; Soraya Heuss-A&szlig ; bichler
• 关键词：Zirconia ; Degradation ; Hot corrosion ; Waste-to-energy ; Self-healing coating
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：36
• 期：14
• 页码：3495-3503
• 全文大小：2747 K

文摘

Yttria‐stabilized zirconia is supposed to be a promising candidate as anti‐corrosion coating on steel tubes in waste‐to‐energy (WTE) plants. Since the formation of low‐melting eutectic salt melts on the surface of those tubes is a common process within WTE plants, the performance of yttria‐stabilized zirconia under these conditions was evaluated. Beads of 5 wt.‐% Y₂O₃ stabilized zirconia were embedded in an equimolar mixture of KCl-K₂SO₄-ZnCl₂-ZnSO₄. In a temperature range between 600 and 700 °C under an atmosphere of N₂—2.55 vol.‐% HCl—0.45 vol.‐% O₂, a dissolution and recrystallization of the zirconia was observed. The driving force of this process is a changing electromotive force in combination with an increasing basicity of the melt, controlled by reactions between melt and atmosphere. With respect to an application as anti‐corrosion coating, the recrystallization process can enable the material to act as a self‐healing coating.