Hydrolysis-Induced Aqueous Gelcasting for Near-Net Shape Forming of ZTA Ceramic Composites

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

Autores

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

Revista

Título: Journal of the European Ceramic Society

Vol. 29 Nº 8

Páginas: 1393-1401

ISSN: 0955-2219

Editora: Elsevier

Indexação

ISI Web of Knowledge - 25 Citações

ISI Web of Science

Scopus - 32 Citações

COMPENDEX

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia de materiais

Outras Informações

ID Authenticus: P-003-KH2

DOI: 10.1016/j.jeurceramsoc.2008.08.033

Abstract (EN): 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.% Al2O3 + 30 wt.% ZrO2) and ZTA-60 (40 wt.% Al2O3 + 60 wt.% ZrO2). 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 Al2O3 was replaced by equivalent amounts of AlN 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 ◦C in comparison to those consolidated by HAS.

Idioma: Inglês

Tipo (Avaliação Docente): Científica