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

AYAS E., KARA A., KARA F.

Key Engineering Materials, vol.403, pp.243-244, 2009 (Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 403
  • Publication Date: 2009
  • Doi Number: 10.4028/3-908454-00-x.243
  • Journal Name: Key Engineering Materials
  • Journal Indexes: Scopus
  • Page Numbers: pp.243-244
  • Keywords: Electrical conductivity, Segregated network, Spark plasma sintering, TiN, α-β SiAlON
  • Anadolu University Affiliated: Yes

Abstract

An effective approach for preparing electrically conductive SiAlON-TiN composites was developed. Granules of a designed composition of α-β SiAlON was obtained by spray drying and coated with varying amounts of TiO 2 powder homogenously by mechanical mixing. Fully dense composites were obtained by spark plasma sintering (SPS) under a pressure of 50 MPa at 1650°C for 5min. According to the SEM analysis, unique microstructures containing continuously segregated in-situ formed TiN phase in 3-D were achieved. Additionally, XRD studies revealed that all TiO2 was successfully converted to TiN. The resistivity of the α-β SiAlON (1×1011 Ω.m) was drastically reduced with the addition of only 5 vol. % TiO2 (2×10-4 Ω.m).