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

Müller, Dirk and Heuss-Aßbichler, Soraya (2016): Behavior of yttria-stabilized zirconia in the presence of molten salts: Part 1. Dissolution and recrystallization phenomena. In: Journal of the European Ceramic Society, Vol. 36, No. 14: pp. 3495-3503

Abstract

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 degrees C under an atmosphere of N-2-2.55 vol.-% HCl-0.45 vol.-% O-2, 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. (C) 2016 Elsevier Ltd. All rights reserved.

• Item Type: Journal article
• Faculties: Geosciences > Department of Earth and Environmental Sciences
• Subjects: 500 Science > 550 Earth sciences and geology
• ISSN: 0955-2219
• Language: English