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Factors influencing structural evolution in the oxide of hot-pressed Si3N4-Y2O3-SiO2 materials

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Abstract

X-ray diffraction, SEM, EDS and WDS studies were performed of the structure and morphology of the oxide developed on hot-pressed compositions of the Si3N4-Si2N2O-Y2Si2O7 sub-system subjected to short-term (∼30 h) oxidation in air atT=1273 to 1673 K. Viscosity of the oxide glassy phase, ionic mobility and oversaturation degree of the atomic species involved were found to be the most important parameters in the control of structural evolution of the oxide. Clear links appear to exist between compositional parameters of the grain-boundary phase of the hot-pressed materials and the evolution of the crystal phases in the oxide. The ΣMi/Y ratio (ΣMi, total amount of metal impurities) in the grain-boundary phase, seems to play a major role in the transport properties of the oxide glassy phase.

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Authors and Affiliations

  1. C.N.R., Research Institute for Ceramics Technology, Faenza, Italy

    G. N. Babini, A. Bellosi & P. Vincenzini

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  1. G. N. Babini
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  2. A. Bellosi
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  3. P. Vincenzini
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Babini, G.N., Bellosi, A. & Vincenzini, P. Factors influencing structural evolution in the oxide of hot-pressed Si3N4-Y2O3-SiO2 materials. J Mater Sci 19, 3487–3497 (1984). https://doi.org/10.1007/BF00552263

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  • DOI: https://doi.org/10.1007/BF00552263

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