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J. Korean Ceram. Soc. > Volume 43(8); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(8): 472.
doi: https://doi.org/10.4191/kcers.2006.43.8.472
The Effect of Processing Variables and Composition on the Nitridation Behavior of Silicon Powder Compact
Young-Jo Park, Hyung-Woo Lim, Eugene Choi, Hai-Doo Kim
Powder Materials Research Center, Korea Institute of Machinery and Materials
The effect of compositional and processing variables on a nitriding reaction of silicon powder compact and subsequent post sintering of RBSN (Reaction-Bonded Silicon Nitride) was investigated. The addition of a nitriding agent enhanced nitridation rate substantially at low temperatures, while the formation of a liquid phase between the nitriding agent and the sintering additives at a high temperature caused a negative catalyst effect resulting in a decreased nitridation rate. A liquid phase formed by solely an additive, however, was found to have no effect on nitridation for the additive amount used in this research. The original site of a decomposing pore former was loosely filled by a reaction product ($Si_3N_4$), which provided a specimen with nitriding gas passage. For SRBSN (Sintered RBSN) specimens of high porosity, only a marginal dimensional change was measured after post sintering. Its engineering implication for near-net shaping ability is discussed.
Key words: RBSN, SRBSN, Nitridation rate, Porosity, DPF
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