Effect of Phase Transformation and Fine Particle Dispersion on Densification of High Purity Nanocrystalline γ-Phase Dispersed α-Alumina

Abstract:

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The effect of phase transformation and fine particle dispersion on densification behavior of high purity nanocrystalline alumina was investigated. The γ/α phase ratio of the mixture compacts were affected detrimentally by sinterability and phase transformation of α-phase alumina ceramics. The densification was significantly deteriorated with increasing γ-phase owing to faceted pores which are caused by the formation of a colony. The faceted pores were not existed in the α- Al2O3 ceramics with 10% γ-phase. Densification of the 10% γ-phase dispersed α-Al2O3 ceramics was significantly enhanced by rapid transformation of α-alumina. The grain growth was effectively inhibited by a small amount of nanoparticle dispersion for the alumina ceramics. As a result, dense nanostructured alumina can be achieved in the 10% γ-phase dispersed α-Al2O3 ceramics, even sintering at 1400oC for 3 hours.

Info:

Periodical:

Solid State Phenomena (Volumes 124-126)

Edited by:

Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park

Pages:

831-834

DOI:

10.4028/www.scientific.net/SSP.124-126.831

Citation:

S. W. Kim and S. Y. Kim, "Effect of Phase Transformation and Fine Particle Dispersion on Densification of High Purity Nanocrystalline γ-Phase Dispersed α-Alumina", Solid State Phenomena, Vols. 124-126, pp. 831-834, 2007

Online since:

June 2007

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$35.00

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