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http://dx.doi.org/10.4191/kcers.2012.49.4.363

The Effect of Si3N4 Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures  

Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Ko, Jae-Woong (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Lee, Jae-Wook (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Kim, Hai-Doo (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Publication Information
Abstract
Nitriding and post-sintering behavior of powder mixture compacts were investigated. As mixture compacts are different from simple Si compacts, the fabrication of a sintered body with a mixture composition has engineering implications. In this research, in specimens without a pore former, the extent of nitridation increased with $Si_3N_4$ content, while the highest extent of nitridation was measured in $Si_3N_4$-free composition when a pore former was added. Large pores made from the thermal decomposition of the pore former collapsed, and they were filled with a reaction product, reaction-bonded silicon nitride (RBSN) in the $Si_3N_4$-free specimen. On the other hand, pores from the decomposed pore former were retained in the $Si_3N_4$-added specimen. Introduction of small $Si_3N_4$ particles ($d_{50}=0.3{\mu}m$) into a powder compact consisting of large silicon particles ($d_{50}=7{\mu}m$) promoted close packing in the green body compact, and resulted in a stable strut structure after decomposition of the pore former. The local packing density of the strut structure depends on silicon to $Si_3N_4$ size ratio and affected both nitriding reaction kinetics and microstructure in the post-sintered body.
Keywords
Reaction bonding; Silicon nitride; Porous; Diluents;
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Times Cited By KSCI : 1  (Citation Analysis)
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