Hot corrosion of γ-Y2Si2O7 in strongly basic Na2CO3 molten salt environment

Sun, Ziqi, Li, M., Li, Z., & Zhou, Y. (2008) Hot corrosion of γ-Y2Si2O7 in strongly basic Na2CO3 molten salt environment. Journal of the European Ceramic Society, 28(1), pp. 259-265.

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Abstract

γ-Y2Si2O7 is a promising candidate both for high temperature structural applications and as thermal barrier coatings due to its unique combination of properties, such as high melting point, good machinability, high thermal stability, low linear thermal expansion coefficient (3.9 × 10-6 K-1, 25-1400 °C) and low thermal conductivity (<3 W/m K above 300 °C). In this work, the hot corrosion behavior of γ-Y2Si2O7 in strongly basic Na2CO3 molten salt at 850-1000 °C for 20 h in flowing air was investigated. In the employed conditions, multi-layer corrosion scales with total thickness less than 90 μm were formed. At 850-900 °C, the outmost layer of the scale was composed of the reprecipitation of Y2O3, the bottom of a Si-rich Na2O·xSiO2 (x > 3.65) melt layer, and the middle of a NaYSiO4 layer. At 1000 °C, the corrosion products turned out to be a mixture of NaY9Si6O26 and Si-rich Na2O·xSiO2 (x > 3.65). In all cases, a thin layer of protective SiO2 formed under the Na2O·xSiO2 melt and protected the bulk material from further corrosion.

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ID Code: 94645
Item Type: Journal Article
Refereed: Yes
DOI: 10.1016/j.jeurceramsoc.2007.05.011
ISSN: 0955-2219
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 Elsevier
Deposited On: 11 Apr 2016 05:12
Last Modified: 19 Apr 2016 05:05

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