Dense nanometric ZrO2-Al2O3 from spray-pyrolysed powders

Jayaram, V. ; Mishra, R. S. ; Majumdar, B. ; Lesher, C. ; Mukherjee, A. (1998) Dense nanometric ZrO2-Al2O3 from spray-pyrolysed powders Colloids and Surfaces A: Physicochemical and Engineering Aspects, 133 (1-2). pp. 25-31. ISSN 0927-7757

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09277...

Related URL: http://dx.doi.org/10.1016/S0927-7757(97)00108-8

Abstract

Powders of ZrO2-Al2O3 synthesized by spray pyrolysis of aqueous solutions of nitrates have been subjected to high-pressure rapid-heating compaction at 700-900°C. The original amorphous phase undergoes decomposition during heat treatment via a series of metastable crystalline solid solutions to the equilibrium phases of monoclinic ZrO2 and α-alumina. The application of high pressure results in a substantial decrease in the temperature required for each transformation. Maximum densification during pressure-assisted sintering appears to occur at the lowest temperature (700° C), in which the predominant phase is a tetragonal ZrO2-Al2O3 solid solution, with a small amount of partitioned γ-alumina. Under these optimum conditions, the crystalline size is 10-20 nm with no evidence of porosity.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Nanocrystalline; Spray-pyrolysed; ZrO2- Al2O3; High Pressure; Sintering
ID Code:13642
Deposited On:12 Nov 2010 15:12
Last Modified:04 Jun 2011 07:18

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