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Hot Corrosion Behavior of ZrB2-SiC-Graphite Composite in NaCl and Na2SO4 Molten Salts
X. Liu1, G. Wang2, L. Liu2, Z. Wang1, Z. Wu1, M. Liu1
1 School of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China.
2 Beijing Institute of Aerospace Systems Engineering, Beijing 100076, China.
received March 6, 2018, received in revised form April 18, 2018, accepted April 28, 2018
Vol. 9, No. 3, Pages 309-318 DOI: 10.4416/JCST2018-00020
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.
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Keywords
ZrB2-based composites, molten salts, hot corrosion, sulfidation
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