Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Microstructure and Mechanical Properties of β-SiAlON Ceramics Fabricated Using Self-Propagating High-Temperature Synthesized β-SiAlON Powder

  • Kim, Min-Sung (Advanced Engineering Division, Kyungnam University) ;
  • Go, Shin-Il (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Kim, Jin-Myung (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Park, Young-Jo (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Kim, Ha-Neul (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Ko, Jae-Woong (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Yun, Jon-Do (Advanced Engineering Division, Kyungnam University)
  • Received : 2017.04.25
  • Accepted : 2017.06.23
  • Published : 2017.07.31
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Abstract

${\beta}-SiAlON$, based on its high fracture toughness, good strength and low abrasion resistance, has been adopted in several industrial fields such as bearings, turbine blades and non-ferrous metal refractories. In general, ${\beta}-SiAlON$ is fabricated by reactive sintering using expensive $Si_3N_4$ and AlN as starting materials. On the other hand, in this study, a cheaper ${\beta}-SiAlON$ starting powder synthesized by SHS was employed to improve price competitiveness compared to that of the reactive sintering process. ${\beta}-SiAlON$ ceramics with various content of the sintering additive $Y_2O_3$ up to 7 wt% were fabricated by conventional pressureless sintering at $1800^{\circ}C$ for 2 to 8 h under $N_2$ pressure of 0.1 MPa. The specimen with 3 wt% $Y_2O_3$ exhibited the best mechanical properties: hardness of 14 GPa, biaxial strength of 830 MPa, fracture toughness of $5MPa{\cdot}m^{1/2}$ and wear rate of about $3{\times}10^{-6}mm^3/N{\cdot}m$.

Keywords

References

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