Textured α-SiAlON Ceramics via Templated Grain Growth |
| Journal |
Materials Science Forum (Volume 554) |
| Volume |
Nitrides and Oxynitrides III |
| Edited by |
Hasan Mandal |
| Pages |
79-84 |
| DOI |
10.4028/www.scientific.net/MSF.554.79 |
| Online since |
August, 2007 |
| Authors |
S.R. Kushan,
N. Tamsu,
N.C. Acikbas,
E. Suvaci,
Hasan Mandal
|
| Keywords |
Orientation, Seeding, Tape Casting, α-SiAlON |
| Abstract |
In this study, textured α-SiAlON ceramic was produced by templated grain growth
process. In order to enhance the alignment of the seeds, gated tape casting arrangement was utilized.
Y-Ce codoped seeds were synthesized to induce the preferred orientation. For the production of the
seeds, Ce3+ was used as a sintering additive due to its well-known effect on the formation of
elongated α-SiAlON grains. In addition, Y3+ was used to stabilize Ce3+ in α-SiAlON structure.
Gated tape casting arrangement was also used to enhance the alignment of the seeds in the green
tape. After the lamination and sintering, preferentially aligned α-SiAlON grains were observed by
the microstructural investigation. In addition, XRD results obtained from the planes parallel and
perpendicular to the casting direction indicated the alignment of grains in α-SiAlON ceramics.
Hardness measurements also confirmed that the alignment of the grains results in 8% increase in
hardness value of the plane perpendicular to the casting direction with respect to that of the parallel
one. |
| Full Paper |
Get the full paper by clicking here
|
| Preview |
Free first page example |
