Hydrolysis-induced aqueous gelcasting for near-net shape forming of ZTA ceramic composites
authors Ganesh, I; Olhero, SM; Torres, PMC; Alves, FJ; Ferreira, JMF
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords ZTA ceramics; Hydrolysis-assisted solidification; Hydrolysis-induced aqueous gelcasting; Hardness; Flexural strength; Fracture toughness
keywords FRACTURE-TOUGHNESS; ASSISTED SOLIDIFICATION; ALUMINA; ROUTE
abstract A new near-net shape forming process called "hydrolysis-induced aqueous gelcasting" (GCHAS) is reported in this paper for the consolidation of ZTA composites, ZTA-30 (70 wt.% Al(2)O(3) + 30 wt.% ZrO(2)) and ZTA-60 (40 wt.% Al(2)O(3) + 60 wt.% ZrO(2)). For comparison purposes, ceramics having the same chemical compositions were also consolidated by hydrolysis-assisted solidification (HAS). All the starting suspensions contained a solids loading of 50 vol.%. In the precursor powder mixtures, 1-5 wt.% of Al(2)O(3) was replaced by equivalent amounts of AIN to enhance or promote or co-promote the consolidation of suspensions by HAS or by GCHAS, respectively. The suspensions for GCHAS were prepared by dispersing the ZTA powder precursor mixtures in a premix solution of 20 wt.% MAM (methacrylamide), MBAM (methylenebisacrylamide) and NVP (n-vinylpyrrolidinone) in 3:1:3 ratio in de-ionized water. Ceramics consolidated via GCHAS exhibited superior mechanical properties after consolidation and after sintering for 1 h at 1600 degrees C in comparison to those consolidated by HAS. (C) 2008 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2009
volume 29
issue 8
beginning page 1393
ending page 1401
digital object identifier (doi) 10.1016/j.jeurceramsoc.2008.08.033
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000265512400011
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