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

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

Authors

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

Journal

Title: Journal of the European Ceramic Society

Vol. 29 No. 8

Pages: 1393-1401

ISSN: 0955-2219

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 25 Citations

ISI Web of Science

Scopus - 32 Citations

COMPENDEX

INSPEC

Scientific classification

FOS: Engineering and technology > Materials engineering

CORDIS: Technological sciences > Engineering > Materials engineering

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific