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Hot Corrosion Mechanism of Silicon Nitride Based Ceramics Exposed to Coal Slag Containing Potassium Sulfate

Published online by Cambridge University Press:  03 September 2012

Z.B. Yu ,
W.H. Li  and
N.F. Li
Z.B. Yu
Affiliation:
Shandong R&D Institute of Industrial Ceramics, Zibo, Shandong, 255031, China
W.H. Li
Affiliation:
Shandong R&D Institute of Industrial Ceramics, Zibo, Shandong, 255031, China
N.F. Li
Affiliation:
Wuhan University of Technology, Wuhan, Hubei, 430070, China
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Abstract

The corrosion of three kinds of silicon nitride based ceramics by static liquid potassium sulfate-coal slag immersion was investigated at high temperatures. The reaction kinetics between silicon nitride based ceramics and coal-slag-potassium sulfate was investigated, different kinetic curves were obtained at different temperatures, it was l-(l-a)1/3=kt at 1350°C and a=kt2at 1400°C. Phase composition, microstructure of the materials before and after corrosion were studied by XRD, SEM/EDAX, and EPMA etc, which lead to the following detailed corrosion mechanism: (1) oxidation of silicon nitride based ceramics by potassium salt and oxygen in air simultaneously and formation of silicon dioxide. (2) melting of as-formed silica by potassium sulfate or K-contained silicate and resulting in a silicate melt Me-K20-xSiO2, and (3) formation of a protective silica layer below the silicate melt.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 367: Symposium P – Fractal Aspects of Materials , 1994 , 453
Copyright
Copyright © Materials Research Society 1995

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