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J. Korean Ceram. Soc. > Volume 44(7); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(7): 354.
doi: https://doi.org/10.4191/kcers.2007.44.7.354
The Effect of the Sintering Additives on the Fabrication and Thermal Conductivity of Porous Sintered RBSN
Young-Jo Park, Hai-Doo Kim
Powder Materials Research Division, Korea Institute of Materials Science
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 ${beta}-Si_3N_4$ 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 $1800^{circ}C$ for 2 h. It was found that the thermal conductivity of porous $Si_3N_4$ ceramics is dominated by the porosity more than this factor is influenced by the addition of $Al_2O_3$.
Key words: RBSN, SRBSN, DPF, Porous, Thermal conductivity
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