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Porous Si 3 N 4 Ceramics Prepared via Nitridation of Si Powder with Si 3 N 4 Filler and Postsintering
Author(s) -
Yao Dongxu,
Zeng YuPing,
Zuo Kaihui,
Jiang Dongliang
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2011.02627.x
Subject(s) - materials science , flexural strength , porosity , sintering , ceramic , composite material , silicon nitride , filler (materials) , grain size , nitride , layer (electronics)
Porous silicon nitride (Si 3 N 4 ) ceramics with high porosity were prepared via nitridation of Si powder, using Si 3 N 4 as filler and Y 2 O 3 as sintering additive. After nitridation, samples with high Si 3 N 4 filler content showed high porosity, low flexural strength, and low grain size. A porosity of 50–62% a flexural strength of 16–49 MPa were obtained. After postsintering at 1750°C, sample with Si 3 N 4 filler content of 50% exhibited a bimodal grain size distribution of elongated β‐Si 3 N 4 grains with high aspect ratio embedded in fine‐grained matrix. Porous Si 3 N 4 ceramics with a porosity of 48–60% and a flexural strength of 100–145 MPa were obtained.