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Sintering Kinetics of Porous Ceramics from Natural Diatomite
Author(s) -
Zhang Xuebin,
Liu Xingqin,
Meng Guangyao
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00288.x
Subject(s) - sintering , scanning electron microscope , porosity , isothermal process , materials science , activation energy , shrinkage , porosimetry , ceramic , dimensionless quantity , kinetics , volume (thermodynamics) , exponent , composite material , mineralogy , thermodynamics , porous medium , chemistry , physics , quantum mechanics , linguistics , philosophy
The sintering kinetics of the porous ceramics from natural diatomite is investigated by means of stepwise isothermal dilatometry (SID) accompanied with XRD, scanning electron microscope (SEM), and porosity measurement. We find that the isothermal shrinkage data from SID could be well analyzed to get kinetic parameters according to the empirical rate equation developed by Makipirtti–Meng ,where Y is the fractional volume shrinkage during sintering process and n a dimensionless exponent. The apparent activation energy Δ E values obtained for 850°–1000°C and 1050°–1150°C are 911.8 and 610.5 kJ/mol, respectively. Correspondingly, the exponent n values for the two temperature ranges are also much different and can be served to reveal the morphology changing during the sintering process, which is well consistent with the SEM observation.