The Effect of SiO<sub>2</sub> Additives on Sintering Ca-α-SiAlON Powder Prepared by Combustion Synthesis

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  • IIZUKA Takamasa
    Dept. Mechanical and Materials Engineering, Kanagawa Institute of Industrial Science and Technology
  • YOKOUCHI Masahiro
    Dept. Mechanical and Materials Engineering, Kanagawa Institute of Industrial Science and Technology

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Other Title
  • 燃焼合成Ca-α-SiAlON粉末のホットプレス焼結におけるSiO<sub>2</sub>の添加効果

Abstract

<p>Composite of Ca-α-SiAlON and β-SiAlON was obtained by hot pressing of mixture of commercially available Ca-α-SiAlON and SiO2 powders under 40 MPa at 1800°C for 2hours. The Ca-α-SiAlON powder used in this study was manufactured with combustion synthesis technique. Effect of SiO2 additive on the mechanical properties of the SiAlON composite was investigated by changing the amount of the additives; 1, 3, 5 and 7 wt%. The highest strength, 736 MPa for the 4 points bending strength, was obtained in the SiAlON composite sintered with the addition of 5 wt% SiO2 powder. From the results of XRD, SEM, and EPMA analysis, we found the formation of columnar β-SiAlON grains facilitated by the addition of SiO2 powder led to the high strength.</p>

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