Grain growth of β-silicon nitride in RE-Mg-Si-O-N liquid

Noritaka Saito, Daiji Nakata, Kunihiko Nakashima, Ayumu Umemoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Isothermal growth of β-Si3N4 crystals dispersed in a series of rare-earth (RE = Y, Gd, Nd and La) oxynitride liquids (RE-Mg-Si-O-N) was studied after heat treatment at 1773 K for 64 to 512 min, The microstructural characterization of α- and β-Si3N 4 crystals was quantitatively analyzed by electron microscopy, The volume fraction of β-Si3N4 crystals in oxynitride glasses increased with heat treatment time, It is determined that the rate of α/β transformation in the oxynitride liquid with Y2O 3 additive can be faster than that in oxynitride liquids with other additives, Likewise, the radii of rare-earth elements make significant differences in the mean grain size and aspect ratio of β-Si 3N4 crystals, In all cases mentioned above, a marked change was observed in the order of ionic radius from La to Y, The mean width of the needlelike β-Si3N4 crystals heat-treated with La2O3 additive was almost constant in the time range of heat treatment in this study. However, the aspect ratio of β-Si 3N4 crystals with La2O3 additive was found to be much larger than that in oxynitride liquids with other additives, indicating negligible growth of β-prism plane.

Original languageEnglish
Title of host publicationDevelopments and Applications of Advanced Engineering Ceramics and Composites - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6
Pages73-80
Number of pages8
Publication statusPublished - Jul 26 2006
Event6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6 - Maui, HI, United States
Duration: Sep 11 2005Sep 16 2005

Publication series

NameCeramic Transactions
Volume192
ISSN (Print)1042-1122

Other

Other6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6
CountryUnited States
CityMaui, HI
Period9/11/059/16/05

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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  • Cite this

    Saito, N., Nakata, D., Nakashima, K., & Umemoto, A. (2006). Grain growth of β-silicon nitride in RE-Mg-Si-O-N liquid. In Developments and Applications of Advanced Engineering Ceramics and Composites - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6 (pp. 73-80). (Ceramic Transactions; Vol. 192).