Journal
CERAMICS INTERNATIONAL
Volume 35, Issue 3, Pages 1039-1044Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2008.04.021
Keywords
Gelcasting; Si3N4 green body; Warpage rate; Shrinkage rate; Flexural strength
Categories
Funding
- Project of National Key Laboratory of Advanced Functional Composite Materials [9140C5602040805]
- New Century Excellent Talents in University [NECT-05-0838]
- National Basic Research Program of China [2006CB601201]
- Science and Technology Department of Shaanxi Province [2005K06-G22]
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The gelcasting technique was employed to prepare Si3N4 green body. The monomers used in the research were acrylamide (AM) and N,N'-methylenebisacrylamide (MBAM). The influences of the monomer content (AM and MBAM) and the ratio of monomers (AM/MBAM) on the warpage rate, shrinkage rate, and the flexural strength Of Si3N4 ceramics green body were investigated. Both warpage rate and shrinkage rate of green body were found to decrease with the increase of monomer content, and monotonically increase with the ratio of monomers after drying. The variation of warpage rate with the ratio of monomers is evident when monomer content is 20 wt.%, but the variations are not evident when monomer contents are 40 and 55 wt.%. The flexural strength of the green body is highest at an optimum value of the monomers ratio, and increases with increasing monomer content, reaching 50-90 MPa when monomer contents are 40 and 55 wt.%. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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