Hydrolysis-induced aqueous gelcasting for near-net shape forming of ZTA ceramic composites

被引:35
作者
Ganesh, Ibram [1 ,2 ]
Olhero, Susana M. [1 ]
Torres, Paula M. C. [1 ]
Alves, Femando J. [3 ]
Ferreira, Jose M. F. [1 ]
机构
[1] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal
[2] Int Adv Res Ctr Powder Met & New Mat ARCI, Ctr Adv Ceram, Hyderabad 500005, Andhra Pradesh, India
[3] Univ Porto, FEUP, Dept Mech Engn & Ind Management, P-4100 Oporto, Portugal
关键词
ZTA ceramics; Hydrolysis-assisted solidification; Hydrolysis-induced aqueous gelcasting; Hardness; Flexural strength; Fracture toughness; FRACTURE-TOUGHNESS; ASSISTED SOLIDIFICATION; ALUMINA;
D O I
10.1016/j.jeurceramsoc.2008.08.033
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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 AIN 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 degrees C in comparison to those consolidated by HAS. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1393 / 1401
页数:9
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