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Synthesis and Properties of Porous Single‐Phase β′‐SiAlON Ceramics
Author(s) -
Yang JianFeng,
Beppu Yoshihisa,
Zhang GuoJun,
Ohji Tatsuki,
Kanzaki Shuzo
Publication year - 2002
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.1151-2916.2002.tb00370.x
Subject(s) - sialon , sintering , materials science , scanning electron microscope , ceramic , transmission electron microscopy , flexural strength , porosity , phase (matter) , relative density , mineralogy , analytical chemistry (journal) , composite material , chemical engineering , crystallography , nanotechnology , chemistry , chromatography , organic chemistry , engineering
Single‐phase β′‐SiAlON (Si 6− z Al z O z N 8− z , z = 0–4.2) ceramics with porous structure have been prepared by pressureless sintering of powder mixtures of á‐Si 3 N 4 , AlN, and Al 2 O 3 of the SiAlON compositions. A solution of AlN and Al 2 O 3 into Si 3 N 4 resulted in the β′‐SiAlON, and full densification was prohibited because no other sintering additives were used. Relative densities ranging from 50%–90% were adjusted with the z ‐value and sintering temperature. The results of X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy analyses indicated that single‐phase β′‐SiAlON free from a grain boundary glassy phase could be obtained. Both grain and pore sizes increased with increasing z ‐value. Low z ‐value resulted in a relatively high flexural strength.