Abstract
Single‐phase β′‐SiAlON (Si6−zAlzOzN8−z, z= 0–4.2) ceramics with porous structure have been prepared by pressureless sintering of powder mixtures of á‐Si3N4, AlN, and Al2O3 of the SiAlON compositions. A solution of AlN and Al2O3 into Si3N4 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.
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