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Porous Silicon Nitride Ceramics Prepared by Extrusion Using Starch as Binder
Author(s) -
Jiang GuangPeng,
Yang JianFeng,
Gao JiQiang,
Niihara Koichi
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02701.x
Subject(s) - materials science , extrusion , microstructure , sintering , flexural strength , porosity , composite material , ceramic , silicon nitride , layer (electronics)
Green bodies of porous silicon nitride ceramics were shaped by the extrusion technique using starch simultaneously as binder during extrusion and as pore‐maker during subsequent thermal debinding. The different porosities, microstructures, and mechanical properties after the extrusion, drying, debinding, and sintering stages were investigated. The results showed that the porosity, density, microstructure, and flexural strength of samples varied greatly through the whole process stages. The resultant samples had a 160 MPa flexural strength at a porosity of 43% and a uniform fibrous interlocking microstructure consisting of well‐developed rod‐like β‐Si 3 N 4 grains. In addition, porosity, microstructure, and strength can be further tailored by sintering conditions such as the sintering nitrogen pressure. Extrusion using cheap starch as binder and pore‐maker is a promising preparation route for manufacturing cost‐effective porous silicon nitride ceramics.