| 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 |
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| ABSTRACT |
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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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