| 납석으로 카올린을 대체한 도자기 소지의 뮬라이트 형성과 특성 |
| 곽안나, 김근희, 피재환, 김종영, 조우석, 김경자, 이종근1 |
한국세라믹기술원 도자세라믹센터
1대한세라믹스 주식회사 |
| Mullite Formation and Effect in Porcelain Body by Replacing Kaolinite with Pyrophyllite |
| An-Na Kwak, Geun-Hee Kim, Jae-Hwan Pee, Jong-Young Kim, Woo-Seok Cho, Kyeong-Ja Kim, Jong-Keun Lee1 |
Whiteware Ceramic Center, KICET
1Daehan Ceramics Co., Ltd. |
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| ABSTRACT |
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Mullite formation in a porcelain body was promoted extensively by replacing kaolinite with pyrophyllite. Effects of mullite formation and vitrification by substitution of kaolinite with pyrophyllite on the mechanical and thermal properties were investigated. Addition of 45-55% pyrophyllite (pyrophyllite (45-55%)-feldspar (30%)-Gairome clay (20%)) could vitrify the sintered samples (water absorption : 0.05%, bulk density : 2.66g/cc) and improve the flexural strength (122MPa) when fired at $1280^{circ}C$. Mullite formation was found to be decreased with increasing content of pyrophyllite. On the contrary, beyond 50% of pyrophyllite quartz and cristobalite phases was found to be increased. Thermal expansion coefficient of the samples decreased with increase of mullite phase. In triaxial system of pyrophyllite-feldspar-clay, the mullite formation of the samples with 50% pyrophyllite reaches about 78.7% and thermal expansion coefficient was found to be $5.4{times}10^{-6}/K$. |
| Key words:
Porcelain, Pyrophyllite, Kaolinite, Mullitization, Densification |
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