Thermal stability of rare earth densified α-sialon ceramics


MANDAL H., Thompson D. P.

Key Engineering Materials, no.136 PART 2, pp.990-993, 1997 (Scopus) identifier

  • Publication Type: Article / Article
  • Publication Date: 1997
  • Journal Name: Key Engineering Materials
  • Journal Indexes: Scopus
  • Page Numbers: pp.990-993
  • Keywords: Thermal Stability, α-Sialon Ceramics, α↔β Sialon Transformation
  • Anadolu University Affiliated: Yes

Abstract

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.