A novel approach for preparing electrically conductive alpha/beta SiAlON-TiN composites by spark plasma sintering

Creative Commons License

Ayas E., Kara A., Kara F.

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, vol.116, no.1355, pp.812-814, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 116 Issue: 1355
  • Publication Date: 2008
  • Doi Number: 10.2109/jcersj2.116.812
  • Journal Name: JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.812-814
  • Keywords: SiAlON, TiN, electrical conductivity, SPS, segregated network, MICROSTRUCTURE
  • Anadolu University Affiliated: Yes

Abstract

An effective approach for preparing electrically conductive SiAlON-TiN composites have been developed. Granules of a designed composition of alpha-beta SiAlON were obtained by spray drying and coated with varying amounts of TiO2 powder (0-10 vol%) homogenously by mechanical mixing. Fully dense composites were obtained by spark plasma sintering (SPS) under a pressure of 50 MPa at 1650 degrees C for 5min. According to the scanning electron microscope (SEM) analysis, unique microstructures containing continuously segregated in-situ formed TiN phase in 3D were achieved. Additionally, X-ray diffraction (XRD) studies revealed that all TiO2 was successfully converted to TiN. The resistivity of the alpha-beta SiAlON (1 x 10(11) Omega center dot m) was drastically reduced down to 2 x 10(-4) Omega center dot m at 5 vol % TiO2 addition. (C) 2008 The Ceramic Society of Japan. All rights reserved.