Aqueous Coloidal Processing of ZTA Composites

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

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

Revista

Título: Journal of the American Ceramic Society

Vol. 92 Nº 1

Páginas: 9-16

ISSN: 0002-7820

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 37 Citações

Scopus - 45 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia de materiais

Outras Informações

ID Authenticus: 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).

Idioma: Inglês

Tipo (Avaliação Docente): Científica