Journal ArticleDOI
Effect of Titania Addition on the Sintering of Alumina
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In this article, the sintering behavior of Bayer grade alumina in the temperature range 1400°-1800°C in a partially reducing atmosphere was reported, and a 1 wt% addition of titania was found to improve the sintability of alumina appreciably.Abstract:
The sintering behaviour of Bayer grade alumina in the temperature range 1400°—1800°C in a partially reducing atmosphere is reported. A 1 wt% addition of titania is found to improve the sinterability of alumina appreciably. The pellet density after two hours of sintering was the highest at 1475°C. The microstructure of the sintered pellets showed enhanced but uneven grain growth compared to that of similar alumina pellets without the titania addition. They also showed that the titania addition did not form any eutectic phase with the impurities in the Bayer alumina during the sintering.read more
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Studies on Sintering of Technical Grade Alumina—Part II: Influence of Grinding and Minor Additions on Densification of Commercial Alumina
P. Y. Dalvi,A. K. Kulkarni +1 more
TL;DR: The influence of grinding process and minor additions like MgCO3 and TiO2 on sintering behavior of technical grade commercial alumina has been studied with a view to making dense and impervious al... as discussed by the authors.
References
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Journal ArticleDOI
Sintering Crystalline Solids. II. Experimental Test of Diffusion Models in Powder Compacts
TL;DR: Coble et al. as mentioned in this paper showed that the grain size increases linearly with the logarithm of time, and the grain density increases with the one-third power of time.
Journal ArticleDOI
Role of Solute Segregation at Grain Boundaries During Final–Stage Sintering of Alumina
P. J. Jorgensen,J. H. Westbrook +1 more
TL;DR: In this article, the authors show that the addition of minor amounts of MgO or NiO to Al2O3 inhibits grain growth during sintering by maintaining a high diffusion flux of vacancies from the pores to the grain boundaries.
Journal ArticleDOI
Role of Grain Boundaries in Sintering.
TL;DR: In this paper, the authors show that grain growth during sintering changes the configuration of grain boundaries relative to pores and thus may markedly influence the shrinkage rate; for uniformly distributed pores, shrinkage rates will increase as the grain size decreases.
Journal ArticleDOI
Solubilities of Magnesia, Titania, and Magnesium Titanate in Aluminum Oxide
Salil K. Roy,Robert L. Coble +1 more
TL;DR: In this article, the solubility of MgTiO3 in Al2O3 was measured as 1.10 × loW4, 3.00 × 10”4, 6.80 × 10−4, and 1.40 × 10-3 at 1530, 1630°, 1730° and 183O°C, respectively.