Microstructural development of calcium alpha-SiAlON ceramics with elongated grains

Authors
Wood, CA Zhao, H Cheng, YB
Citation
Ca. Wood et al., Microstructural development of calcium alpha-SiAlON ceramics with elongated grains, J AM CERAM, 82(2), 1999, pp. 421-428
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
82
Issue
2
Year of publication
1999
Pages
421 - 428
Database
ISI
SICI code
0002-7820(199902)82:2<421:MDOCAC>2.0.ZU;2-7
Abstract
Silicon nitride (Si3N4) and SiAlONs can be self-toughened through the growt h of elongated beta-Si3N4/beta-SiAlON grains in sintering. alpha-SiAlONs us ually retain an equiaxed grain morphology and have a higher hardness but lo wer toughness than beta-SiAlONs. The present work has demonstrated that elo ngated alpha-SiAlON grains can also be developed through pressureless sinte ring. alpha-SiAlONs with high-aspect-ratio grains in the calcium SiAlON sys tem have exhibited significant grain debonding and pull-out effects during fracture, which offers promise for in-situ-toughened alpha-SiAlON ceramics.