Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effect of Cr2O3-MgO-Y2O3 Addition on Mechanical Properties of Mullite Ceramics

Cr2O3-MgO-Y2O3 첨가에 따른 뮬라이트 세라믹스의 기계적 성질

  • Lim, Jin-Hyeon (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Shi Yeon (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Yeo, Dong-Hun (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Shin, Hyo-Soon (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Jeong, Dae-Yong (Department of Materials Science and Engineering, Inha University)
  • 임진현 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 김시연 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 여동훈 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 신효순 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 정대용 (인하대학교 신소재공학과)
  • Received : 2017.10.08
  • Accepted : 2017.10.13
  • Published : 2017.12.01
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Abstract

Mullite ($3Al_2O_3{\cdot}2SiO_2$) has emerged as a promising candidate for high-temperature structural materials due to its erosion resistance, chemical and thermal stabilities, relatively low thermal expansion coefficient, excellent thermal shock and creep resistances, and low dielectric constant. However, since the pure mullite sintering temperature is as high as $1,600{\sim}1,700^{\circ}C$, there is an increasing need for a sintering additive capable of improving the strength characteristics while lowering the sintering temperature. Herein we have tried to obtain the optimal sintering additive composition by adding MgO, $Cr_2O_3$, and $Y_2O_3$ to mullite, followed by sintering at $1,325{\sim}1,550^{\circ}C$ for 2 h. With additives of 2 wt% of MgO, 2 wt% of $Cr_2O_3$, 4 wt% of $Y_2O_3$, A density of $3.23g/cm^3$ was obtained for the sintered body at $1,350^{\circ}C$ upon using 2 wt% MgO, 2 wt% $Cr_2O_3$, and 4 wt% $Y_2O_3$ as additives. The three-point flexural strength of that was 275 MPa and the coefficient of thermal expansion (CTE) was $4.15ppm/^{\circ}C$.

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References

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