Ceramics-Silikáty 51, (4) 210 - 212 (2007) |
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DILATOMETRIC STUDY OF Si₃N₄–LAS SYSTEM
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Matovic Branko, Saponjić Aleksandra, Posarać Milica,
Egelja Adela,
Radosavljević-Mihajlović Aleksandra,
Bosković Snezana
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INN Vinca, Material Science Laboratory, 11001 Belgrade, Serbia
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Keywords: Si₃N₄, Additive, Ion-exchanged zeolite, Dilatometer, XRD
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The possibility of using Li-exchanged zeolite (LAS) as additive for densification of Si₃N₄ ceramic was studied. Dilatometry
was used to measure the shrinkage behavior of green bodies prepared from zeolitic precursor and Si₃N₄ powder under a nitrogen
atmosphere from room temperature to 1500°C. The first liquid forms as low as 1080°C, resulting in a significant reduction
of sintering temperature. XRD data reveal that phase transformation from α– to β–Si₃N₄ takes place after the second
phase has been completely converted into a glassy phase. The results show that the Li-exchanged zeolite is a very effective
low temperature sintering additive for silicon nitride. |
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