The role of physical factors in mass transport during sintering of coal ashes and deposit deformation near the temperature of glass transformation

The role of physical properties of melts such as viscosity, diffusion, and surface/interfacial tensions in sintering and deformation mechanisms of ash deposits above glass-transformation temperature is discussed. The differential thermal analysis (DTA) technique was applied to measure glass transfor...

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Bibliographic Details
Published in:Fuel processing technology 1998-07, Vol.56 (1), p.89-101
Main Authors: Nowok, Jan W, Hurley, John P, Benson, Steven A
Format: Article
Language:English
Subjects:
Brittle↔ductile deformation
Coal ash
Sintering
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Summary:The role of physical properties of melts such as viscosity, diffusion, and surface/interfacial tensions in sintering and deformation mechanisms of ash deposits above glass-transformation temperature is discussed. The differential thermal analysis (DTA) technique was applied to measure glass transformation and crystallization temperatures. Sintering of selected coal ashes was performed as a function of temperature in air. The mechanical properties of sintered ashes were measured below and above the glass-transformation temperature, T g. It was found that sintering propensities of amorphous ashes and superplastic-like deformation of deposits above T g depend on mass transport phenomena in the intergranular liquid phase.
ISSN:0378-3820
1873-7188
DOI:10.1016/S0378-3820(97)00087-8