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Investigation on the microstructure of self-reinforced Nd-α-sialon ceramics
- Source :
-
Ceramics International . Jan2008, Vol. 34 Issue 1, p51-56. 6p. - Publication Year :
- 2008
-
Abstract
- Abstract: α-Sialon ceramics doped with Nd2O3 were prepared by hot-pressing sintering at 1900°C holding for 1h with a heat preservation for 1h at 1500°C. Microscopic observations indicate that elongated α-sialon grains appear and are embedded in the fine equiaxed-grain matrix. A small amount of β-sialon phases and secondary crystallized phases M′ (Nd2Si3−x Al x O3+x N4−x ) also exist in the Nd-α-sialon ceramic. A core/shell structure can be found in the elongated α-sialon and β-sialon grains with a high aspect ratio, in which some misfit dislocations surround the core. The 21R AlN-polytype was observed by transmission electron microscopy (TEM), which could not be detected by X-ray diffraction (XRD) due to its trace amount. Different nucleation and growth modes of sialon grains were also discussed. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 34
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 27243928
- Full Text :
- https://doi.org/10.1016/j.ceramint.2006.08.016