Corrosion and recession mechanism of Lu2Si2O7/mullite eutectic

A Lu2Si2O7/Al6Si2O13 (mullite) eutectic oxide was discovered in the Lu2O3-SiO2-Al2O3 ternary system. The composition of the eutectic was Lu2O3:SiO2:Al2O3 = 18.1:54.6:27.3 in molar ratio. The eutectic point was at approximately 1500-1550 C. Since this eutectic system has no boundary phase even if it...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2008-08, Vol.28 (12), p.2359-2361
Main Authors: UENO, Shunkichi, LIN, Hua-Tay, OHJI, Tatsuki
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
Structural ceramics
Technical ceramics
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Summary:A Lu2Si2O7/Al6Si2O13 (mullite) eutectic oxide was discovered in the Lu2O3-SiO2-Al2O3 ternary system. The composition of the eutectic was Lu2O3:SiO2:Al2O3 = 18.1:54.6:27.3 in molar ratio. The eutectic point was at approximately 1500-1550 C. Since this eutectic system has no boundary phase even if it contains a silicate component, no selective corrosion of the mullite phase occurred during a static state water vapour corrosion test at 1300 C. However, a selective recession of mullite phase was observed under a high velocity steam jet environment at 1200 C. 11 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2008.01.008