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Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/176

Title: Effect of Powder Treatment on the Crystallization Behaviour and Phase Evolution of Al(sub)2O(sub)3-High ZrO(sub)2 Nanocomposites
Authors: Rana, R P
Pratihar, S K
Bhattacharyya, S
Keywords: Alumina-zirconia nanocomposite
gel-precipitation
post gel processing treatment
Issue Date: 2005
Publisher: Springer
Citation: Journal of Material Science, (Accepted)
Abstract: Al2O3-ZrO2 composites containing nominally equal volume fraction of Al2O3 and ZrO2 have been synthesized through combined gel-precipitation technique. Subsequently the gels were subjected to three different post gel processing treatments like ultrasonication, ultrasonication followed by water washing and ultrasonication followed by alcohol washing. It was observed that while in unwashed samples crystallization took place at low temperature, crystallization was delayed in the washed gels. The phase transition of ZrO2 in the calcined gels followed the sequence; amorphous  cubic ZrO2 tetragonal ZrO2 monoclinic ZrO2 transition. On the other hand, phase transition in alumina followed the sequence amorphous to γ-Al2O3, the transition taking place at 650oC. No α-Al2O3 could be detected even after calcination at 950oC. However, all the sintered samples had α-Al2O3. In spite of high linear shrinkage (19- 21%) during sintering, the sintered sample had density of only above 70% for all the f...
Description: Copyright for this article belongs to Springer
URI: http://hdl.handle.net/2080/176
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