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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 32  1973
Ceramic Properties of Hard Porcelain in Relation to their Mineralogical Compositions and Microstructures · II-Creep Characteristics
s. P. CHAUDHURI
Pages : 70-78
DOI : 10.1080/0371750X.1973.10840564
Abstract
Creep of hard porcelains has been studied by a short time test, avoiding changes in the phase composition and minor trace during the test. The thermal activation energy of creep ranged from 121.4 to 277 Kcal/mole depending on the mineralogical composition and microstructure. The activation energy, which is a measure of the thermal sensitivity, has been found to be indirectly proportional to the concentration of mullite, directly to the concentration of the glassy phase and almost independent of the quartz content. The size of mullite crystals, howe1•er, has a stronger influence on the activation energy which is directly proportional to the size. The thermal activation energies of creep and the viscous flow of the glassy phase are almost same indicating thereby the strong influence of the glassy phase on the creep characteristics of the samples.
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