Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Phase Formation and Physical Properties of SiAlON Ceramics Fabricated by Gas-Pressure Reactive Sintering

가스압 반응소결로 제조된 SiAlON 세라믹스의 상형성과 물리적 특성

  • Lee, Soyul (Engineering Ceramics Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Choi, Jae-Hyeong (Engineering Ceramics Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Han, Yoonsoo (Engineering Ceramics Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Lee, Sung-Min (Engineering Ceramics Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Seongwon (Engineering Ceramics Center, Korea Institute of Ceramic Engineering & Technology)
  • 이소율 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 최재형 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 한윤수 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 이성민 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 김성원 (한국세라믹기술원 이천분원 엔지니어링세라믹센터)
  • Received : 2017.11.30
  • Accepted : 2017.12.22
  • Published : 2017.12.28
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Abstract

SiAlON-based ceramics are some of the most typical oxynitride ceramic materials, which can be used as cutting tools for heat-resistant super-alloys (HRSA). SiAlON can be fabricated by using gas-pressure reactive sintering from the raw materials, nitrides and oxides such as $Si_3N_4$, AlN, $Al_2O_3$, and $Yb_2O_3$. In this study, we fabricate $Yb_{m/3}Si_{12-(m+n)}Al_{m+n}O_nN_{16-n}$ (m=0.3, n=1.9, 2.3, 2.7) ceramics by using gas-pressure sintering at different sintering temperatures. Then, the densification behavior, phase formation, microstructure, and hardness of the sintered specimens are characterized. We obtain a fully densified specimen with ${\beta}$-SiAlON after gas-pressure sintering at $1820^{\circ}C$ for 90 min. under 10 atm $N_2$ pressure. These SiAlON ceramic materials exhibited hardness values of ~92.9 HRA. The potential of these SiAlON ceramics for cutting tool application is also discussed.

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