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Hot Corrosion Behavior of ZrB₂-SiC-Graphite Composite in NaCl and Na₂SO₄ Molten Salts

X. Liu, G. Wang, L. Liu, Z. Wang, Z. Wu, M. Liu

Journal of Ceramic Science and Technology, Vol. 9, No. 3 (2018), pp. 309-318

DOI: 10.4416/JCST2018-00020

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Abstract

In the present work, the hot corrosion behavior of ZrB2-SiC-graphite (G) composite in different media at 900 and 1000 °C was investigated in detail. The results indicated that the ZrB2-SiC-G composite became slightly corroded in NaCl molten salts owing to the ZrB2 phase of the ZrB2-SiC-G composite being oxidized by oxygen molecules dissolved in the NaCl molten salts. However, the ZrB2-SiC-G composite underwent more severe corrosion in Na2SO4 molten salts, owing to the complex oxidation and sulfidation reaction of the ZrB2-SiC-G composite exposed to oxygen molecules and decomposition products of Na2SO4 at high temperature.

Keywords

ZrB2-based composites, molten salts, hot corrosion, sulfidation  

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