Aqueous Coloidal Processing of ZTA Composites

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Susana M. Olhero (Author) Other; Ibram Ganesh (Author) Other; Paula M .C. Torres (Author) Other; Fernando J. Alves (Author) FEUP; José M. F. Ferreira (Author) Other

Journal

Title: Journal of the American Ceramic Society

Vol. 92 No. 1

Pages: 9-16

ISSN: 0002-7820

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 37 Citations

Scopus - 45 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

CORDIS: Technological sciences > Engineering > Materials engineering

Other information

Authenticus ID: P-003-R3P

DOI: 10.1111/j.1551-2916.2008.02823.x

Abstract (EN): Two different zirconia-alumina composites, ZTA-30 (70 wt.% Al2O3 + 30 wt.% ZrO2) and ZTA-60 (40 wt.% Al2O3 + 60 wt.% ZrO2), 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 Al2O3 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 (3-point bend) strengths (~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 1600ºC in comparison to those consolidated by other techniques, including conventional die pressing (FG).

Language: English

Type (Professor's evaluation): Scientific