Thermal stability of rare earth densified α-sialon ceramics

MANDAL H., Thompson D. P.

Key Engineering Materials, sa.136 PART 2, ss.990-993, 1997 (Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 1997
  • Dergi Adı: Key Engineering Materials
  • Derginin Tarandığı İndeksler: Scopus
  • Sayfa Sayıları: ss.990-993
  • Anahtar Kelimeler: Thermal Stability, α-Sialon Ceramics, α↔β Sialon Transformation
  • Anadolu Üniversitesi Adresli: Evet

Özet

Typical α-sialon and mixed α-β sialon starting compositions were densified by either hot pressing or pressureless sintering using the oxides of Yb, Dy, Sm and Nd. The resulting materials were heat-treated at 1450°C for up to 720 hours (1 month) to observe α → β sialon transformation. The results of microstructural characteristics and the phase assembly showed that the high temperature stability of α-sialon phase depends on the starting composition, the type of rare earth sintering additives, the amount and viscosity of the liquid phase, and the presence or absence of ß-sialon grains in the initial sintered material. © 1997 Trans Tech Publications.