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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.12 (2008)  >  pp.1248-1252

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.12 (2008)   pp.1248 - 1252 Next article>>

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

Mohamed SHAHIEN1), Mohamed RADWAN2), Soshu KIRIHARA2), Yoshinari MIYAMOTO2) and Toshitaka SAKURAI3)
1) Central Metallurgical Research and Development Institute
2) Joining and Welding Research Institute, Osaka Univ.
3) ISMAN J Corporation, Think Miraikobo


Single-phase (β-SiAlON (Si4Al2O2N6, z = 2) powder has been prepared by the combustion synthesis method. The raw materials (Si, Al and SiO2) 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% Y2O3 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.


Keyword:
β-sialon, z value, SHS, Combustion synthesis, SPS

Received: August 31, 2007
Published online: December 19, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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