Cordierite composed of an alumina-silica-magnesia compound has a low coefficient of thermal expansion(CTE) and excellent thermal shock resistance. It also has a low dielectric constant and high electrical insulation. However, due to low mechanical strength, it is limited for use in a ceramic heater. In this study, ZrO2 is added to an 80 wt% cordierite-20 wt% mullite composition, and the effect of ZrO2 addition on the mechanical strength and thermal shock resistance is investigated. With an increasing addition of ZrO2, cordierite-mullite formed ZrO2, ZrSiO4 and spinel phases. With sintering conducted at 1400 °C with the addition of 5 wt% ZrO2 to 80 wt% cordierite-20 wt% mullite, the most dense microstructure forms along with an excellent mechanical strength with a 3-point flexural strength of 238MPa. When this composition is quenched in water at ΔT = 400℃ , the 3-point flexural strength is maintained. Moreover, when this composition is cooled from 800℃ to air, the 3-point flexural strength is maintained even after 100 cycles. In addition, the CTE is measured as 3.00 × 10−6·K−1 at 1000℃ . Therefore, 80 wt% cordierite-20 wt% mullite with 5 wt% ZrO2 is considered to be appropriate as material for a ceramic heater.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 Reference

• 임진현(한국세라믹기술원 엔지니어링세라믹센터, 인하대학교 신소재공학과) | Jin-Hyeon Lim (Korea Institute of Ceramic Engineering & Technology, Engineering Ceramic Center, Department of Materials Science and Engineering, Inha University)
• 김시연(한국세라믹기술원 엔지니어링세라믹센터) | Shi Yeon Kim (Korea Institute of Ceramic Engineering & Technology, Engineering Ceramic Center)
• 여동훈(한국세라믹기술원 엔지니어링세라믹센터) | Dong-Hun Yeo (Korea Institute of Ceramic Engineering & Technology, Engineering Ceramic Center) Corresponding author
• 신효순(한국세라믹기술원 엔지니어링세라믹센터) | Hyo-Soon Shin (Korea Institute of Ceramic Engineering & Technology, Engineering Ceramic Center)
• 정대용(인하대학교 신소재공학과) | Dae-yong Jeong (Department of Materials Science and Engineering, Inha University)