Combustion Synthesis and Sintering of .BETA.-Sialon Ceramics (z = 2)

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概要

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• Single-phase (β-SiAlON (Si<SUB>4</SUB>Al<SUB>2</SUB>O<SUB>2</SUB>N<SUB>6</SUB>, z = 2) powder has been prepared by the combustion synthesis method. The raw materials (Si, Al and SiO<SUB>2</SUB>) were combusted with different ratios of (β-SiAlON (z = 1) diluent (0, 10, 20, 30, 40, 50wt%) in 1MPa of N2 pressure. Without diluent, the reaction temperature was very high (> 2000°C) and the product contained metal Si residue besides (β-SiAlON product. Both the reaction temperature and amount of residual Si decreased gradually with the increase of diluent content up to 50wt%. At 50wt% dilution, the combustion temperature was 1859°C and the XRD analysis showed complete conversion to pure (β-SiAlON (z = 2). The individual peaks of (β-SiAlON (z = 1) diluent were also detected in the XRD patterns and disappeared after using the product itself as a diluent five time repeats of combustion at which single-phase (β-SiAlON (z = 2) was produced. The sinterability of the best synthesized powder was further studied by spark plasma sintering (SPS) with 5wt% Y<SUB>2</SUB>O<SUB>3</SUB> as a sintering aid. High densification (∼97.3%) was obtained after sintering at 1600°C for 5 min under 30MPa pressure with heating and cooling rates of 100°C/min. The Vickers hardness and fracture toughness of the sintered SiAlON were 14.8GPa and 4.4MPam1/2, respectively.

• 日本材料学会の論文

著者

• Miyamoto Yoshinari

  Joining And Welding Research Institute Osaka University

• MIYAMOTO Yoshinari

  Joining and Welding Research Institute, Osaka Univ.

• KIRIHARA Soshu

  Joining and Welding Research Institute, Osaka Univ.

• RADWAN Mohamed

  Joining and Welding Research Institute, Osaka Univ.

• SHAHIEN Mohamed

  Central Metallurgical Research and Development Institute

• SAKURAI Toshitaka

  ISMAN J Corporation, Think Miraikobo

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