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Microstructure formation of α/β-sialons prepared via an aqueous processing route and from cost effective silicon nitride powders
- Source :
- Open Ceramics, Vol 8, Iss , Pp 100199- (2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier, 2021.
-
Abstract
- High quality α/β-Sialon materials were reproducible prepared using cost effective silicon nitride powders and an aqueous processing route. The influence of the powder quality (SN-E10, Silzot HQ, SicoNide P95H) on sintering and phase formation was investigated. With all 3 powders dense Sialon materials with nominal composition RxSi12-(m + n)Alm + nOnN16-n and m = 0.5 and n = 1 and 4 wt% excess rare earth additives could be prepared. The material based on Silzot HQ exhibits the highest α-Sialon content and subsequently the highest hardness due to the lower oxygen content of the starting powder.The microstructural analysis using XRD, FESEM including EDX- and EBSD-mapping reveal, that the α-Sialon grains are formed on existing α-Si3N4 grains of the starting powder. Anisotropic grain growth of the α-Sialon takes place therefore the differences in the microstructure depend strongly on the oxygen content but not from the α/β-content of the starting powders.
Details
- Language :
- English
- ISSN :
- 26665395
- Volume :
- 8
- Issue :
- 100199-
- Database :
- Directory of Open Access Journals
- Journal :
- Open Ceramics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.21afb1b7dd7c4353bac0d325f5d5cab3
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.oceram.2021.100199