EFFECT OF HEATING RATE ON THE EXAGGERATED GRAIN-GROWTH BEHAVIOR OF BETA-SI3N4

Authors
RHEE SH LEE JD KIM DY
Citation
Sh. Rhee et al., EFFECT OF HEATING RATE ON THE EXAGGERATED GRAIN-GROWTH BEHAVIOR OF BETA-SI3N4, Materials letters, 32(2-3), 1997, pp. 115-120
Citations number
31
Categorie Soggetti
Material Science","Physics, Applied
Journal title
Materials letters → ACNP
ISSN journal
0167577X
Volume
32
Issue
2-3
Year of publication
1997
Pages
115 - 120
Database
ISI
SICI code
0167-577X(1997)32:2-3<115:EOHROT>2.0.ZU;2-S
Abstract
The exaggerated growth behavior of beta-Si3N4 grains during post sinte ring heat treatment at 1900 degrees C has been investigated. The speci mens were sintered at 1760 degrees C with slow and rapid heating rates , respectively, and the exaggerated growth behavior was observed to oc cur only in the rapidly heated specimens. The results were explained i n terms of the growth mechanism, similar to two-dimensional nucleation and growth. Practical implication of the results is that the fracture toughness of beta-Si3N4 ceramics can be improved by adopting rapid he ating to the sintering temperature. (C) 1997 Elsevier Science B.V.