Abstract
The densification of Si3N4 with nano-sized sintering aids that were in situ incorporated by a combustion process was studied in comparison with that of sintering aids mixed by ball milling. The combustion process directly produces amorphous and nano-sized Y–Al oxides within the Si3N4 powder. X-ray diffraction results indicate that amorphous Y–Al oxides begin to crystallize into Y3Al5O12 at about 600 °C. Additionally the nano-sized sintering aids are more homogeneously distributed and thereby promote the formation of eutectic melts at lower temperatures during liquid-phase sintering. Therefore, the densification process of Si3N4 during liquid-phase sintering is strongly accelerated. The microstructure of as-sintered parts from combusted powder seems more dense and homogeneous.
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Wang, L., Sigmund, W.M., Roy, S. et al. Improved densification by nano-sized sintering aids for Si3N4 . Journal of Materials Research 14, 4562–4569 (1999). https://doi.org/10.1557/JMR.1999.0618
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DOI: https://doi.org/10.1557/JMR.1999.0618