Aqueous Colloidal Processing of ZTA Composites
authors Olhero, SM; Ganesh, I; Torres, PMC; Alves, FJ; Ferreira, JMF
nationality International
journal JOURNAL OF THE AMERICAN CERAMIC SOCIETY
keywords HYDROLYSIS-ASSISTED SOLIDIFICATION; FRACTURE-TOUGHNESS; DENSIFICATION BEHAVIOR; STARCH CONSOLIDATION; CERAMICS; ALUMINA; BODIES; RHEOLOGY; SPINEL; ROUTE
abstract Two different zirconia-alumina 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)), with potential for orthopedic applications, were processed in aqueous media and consolidated by slip casting (SC), hydrolysis-assisted solidification (HAS), and gelcasting (GC) from suspensions containing 50 vol% solids loading. For comparison purposes, the same ceramic compositions were also consolidated by die pressing of freeze-dried granules (FG). In the HAS process, 5 wt% of Al(2)O(3) in the precursor mixture was replaced by equivalent amounts of AlN to promote the consolidation of the suspensions. Ceramics consolidated via GC exhibited higher green (three-point bend) strengths (similar to 17 MPa) than those consolidated by other techniques. Further, these ceramics also exhibited superior fracture toughness and flexural strength properties after sintering for 1 h at 1600 degrees C in comparison with those consolidated by other techniques, including conventional die pressing (FG).
publisher WILEY-BLACKWELL PUBLISHING, INC
issn 0002-7820
year published 2009
volume 92
issue 1
beginning page 9
ending page 16
digital object identifier (doi) 10.1111/j.1551-2916.2008.02823.x
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000262229500002
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journal impact factor 3.502
5 year journal impact factor 3.475
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