Abstract
The nitriding and post-sintering behavior of silicon powder compact containing sintering additives of 2.3 wt% and 7 wt% were investigated in this study. Regardless of the liquid phase content, elongated large grains of a typical morphology evolved in the post-sintered specimens. Phase analysis revealed a complete phase transformation into β-Si₃N₄ in both porous systems. Oxynitride second phases (mellilite) precipitated in the latter, while those were free in the former containing less amount of liquid phase. The post-sintering condition that yielded a favorable microstructure for a filter application was achieved when the specimens were soaked at 1800℃ for 2 h. It was found that the thermal conductivity of porous Si₃N₄ ceramics is dominated by the porosity more than this factor is influenced by the addition of Al₂O₃.
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