Effect of starting composition, type of rare earth sintering additive and amount of liquid phase on alpha reversible arrow beta sialon transformation

Camuscu N., Thompson D., Mandal H.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol.17, no.4, pp.599-613, 1997 (SCI-Expanded) identifier identifier identifier


Five different alpha-beta sialon and alpha-sialon compositions have been prepared using different rare earth oxide additives namely, neodymium, samarium, dysprosium and ytterbium., Post-sintering heat treatments have been carried out at 1450 degrees C for up to 720 h (one month) to observe alpha --> beta sialon transformation. A combination of X-ray and microstructural observations has shown that the high-temperature stability of the alpha-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 beta-sialon grains in the initial sintered material. (C) 1997 Elsevier Science Limited. All rights reserved.