Si<sub>3</sub>N<sub>4</sub>-Matrix Composite with TiN Particles Formed by In-situ Reaction

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  • UENO Kazuo
    Department of Energy Conversion, Osaka National Research Institute
  • INOUE Takahiro
    Department of Energy Conversion, Osaka National Research Institute
  • SODEOKA Satoshi
    Department of Energy Conversion, Osaka National Research Institute
  • SUZUKI Masato
    Department of Energy Conversion, Osaka National Research Institute
  • ISHIKAWA Hiroshi
    Department of Energy Conversion, Osaka National Research Institute
  • UCHIYAMA Koujirou
    Department of New Materials Technology, Osaka College of High Technology
  • INUI Tsuzuru
    Department of New Materials Technology, Osaka College of High Technology

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  • その場反応により生成されたTiN粒子分散Si<sub>3</sub>N<sub>4</sub>基複合材料
  • Si3N4 Matrix Composite with TiN Particl

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Abstract

Si3N4 matrix composite reinforced with 5vol% TiN particles was fabricated by the in-situ reaction: 4TiO2+4AlN→4TiN+2Al2O3+O2, followed by hot-pressing. The internal TiN formation reaction was studied using TiO2 powders with three different particle sizes (0.28, 0.35 and 1.19μm). The reaction is likely to start from nearly 1150°C and finishes at 1450°C, before the Si3N4 matrix is sintered, and TiN formation is confirmed from the unit cell dimension. TiN particle sizes in the composites sintered at 1600°C and 1850°C were measured. When the TiO2 particle size was large (1.19μm), the particle crumbled into fragments and underwent nitridation to TiN with a smaller size than that of the original TiO2. Smaller TiO2(0.28μm) was converted into TiN particles of nearly the same size. These results suggest that the in situ TiN formation proceeds through nitridation of TiO2 particles.

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