Textured alpha-SiAlON ceramics via templated grain growth

Kushan S. R., Tamsu N., Acikbas N. C., Suvaci E., Mandal H.

5th International Symposium on Nitrides, Eskişehir, Turkey, 3 - 05 April 2006, vol.554, pp.79-81 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 554
  • Doi Number: 10.4028/www.scientific.net/msf.554.79
  • City: Eskişehir
  • Country: Turkey
  • Page Numbers: pp.79-81
  • Keywords: alpha-SiAlON, tape casting, orientation, seeding, CRYSTALS, ALUMINA
  • Anadolu University Affiliated: Yes


In this study, textured alpha-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 a-SiAlON grains. In addition, Y3+ was used to stabilize Ce3+ in a-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 a-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 a-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.