Analysis of two grain sizeα-Al2O3sintering at low heating rate based on master sintering curves

Autor:	Y. Wan, H. S. Cao, Dichen Li, S. S. Zhang, S. O. Chen, Y. C. Zhang, W. Q. Shao
Rok vydání:	2008
Předmět:	Microcrystalline Materials science Mechanics of Materials Mechanical Engineering Alumina ceramic Metallurgy Sintering General Materials Science Condensed Matter Physics Grain size
Zdroj:	Materials Science and Technology. 24:734-738
ISSN:	1743-2847 0267-0836
DOI:	10.1179/174328408x278475
Popis:	Master sintering curves (MSC) were constructed for dry pressed compacts composed of either a submicrocrystalline or a microcrystalline α-Al2O3 powder using constant heating rate dilatometry data containing lower heating rates only. The MSC constructed for two grain size α-Al2O3 were used to evaluate the sintered densities, which agreed well with the density obtained with different heating procedures and determined by Archimedes method. So the applicability of the MSC theory to alumina ceramic sintering under lower heating rates was validated. Apparent activation energies for submicrocrystalline and microcrystalline α-Al2O3 were determined to be 1035 and 1148 kJ mol−1 based on the MSC respectively. The calculated activation energies for densification are higher than the values reported in the literature concerning heating rates >5 K min−1.
Databáze:	OpenAIRE
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