Paper Title:
Textured α-SiAlON Ceramics via Templated Grain Growth
  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.

  Info
Periodical
Edited by
Hasan Mandal
Pages
79-84
DOI
10.4028/www.scientific.net/MSF.554.79
Citation
S.R. Kushan, N. Tamsu, N.C. Acikbas, E. Suvaci, H. Mandal, "Textured α-SiAlON Ceramics via Templated Grain Growth", Materials Science Forum, Vol. 554, pp. 79-84, 2007
Online since
August 2007
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$32.00
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