Parya, T K and Bhattacharyya, R K and Banerjee, S and Adhikari, Uday Bhanu (2010) Co-precipitated ZnAl(2)O(4) spinel precursor as potential sintering aid for pure alumina system. Ceramics International, 36 (4). pp. 1211-1215. ISSN 0272-8842

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Abstract

Ultra-fine ZnAl(2)O(4) spinel hydrogel precursor synthesized from mixed salt solutions of Zn(2+) and Al(3+) ions using ammonium hydroxide hexamethylenetetramine as basic media for co-precipitation was used as bonding material and sintering aid for pure alumina system. The hydrogel powder exhibited some well-defined ZnAl(2)O(4) spinel phases at 800 degrees C. Alumina compacts were fabricated by incorporating small proportions of the precursor in alumina powder and firing at different temperatures (1350-1500 degrees C). The degree of densification was studied by measurement of tired shrinkage, apparent porosity, bulk density and cold crushing strength. Phase compositions and microstructural features of sintered samples were evaluated by XRD and SEM respectively. Addition of 0.2% hydrogel powder to alumina exhibited remarkable influence on development of high mechanical strength. The in situ formed ZnAl(2)O(4) spinel dopant acted as a grain growth inhibitor in the alumina system. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	ZnAl(2)O(4) precursor; Consolidation; Alumina-spinel composites
Subjects:	Engineering Materials
Divisions:	Ceramic Membrane
Depositing User:	Bidhan Chaudhuri
Date Deposited:	15 Feb 2012 07:05
Last Modified:	29 Feb 2012 12:40
URI:	http://cgcri.csircentral.net/id/eprint/852

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