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J. Korean Ceram. Soc. > Volume 27(3); 1990 > Article
Journal of the Korean Ceramic Society 1990;27(3): 394.
기판재료로서의 물라이트-코디어라이트 복합재료에 관한 특성
김경용, 김윤호, 정형진, 김석수1, 김병호1
한국과학기술 연구원 세라믹스 연구부
1고려대학교 재료공학과
Studies of the Mullite-Cordierite Composites as a Substrate Material
Mullite and cordierite were prepared by the sol-gel route. Boehmite, fumed silica and Mg(NO3)2$.$6H2O were their starting materials. Mullite and cordierite powder were mixed by various weight percent. These mixed sols were ball-milled for 48hrs, dried at 100$^{circ}C$, pressed, cold isostatic pressed and sintered at 1490$^{circ}C$ for 2hrs. Mullite-cordierite composites sintered at 1490$^{circ}C$ for 2hrs had>98% of theoretical density. Bending strength of the sintered bodies were 329-249MPa, dielectric constant 7.1-6.7 at 1MHz and thermal expansion coefficient at 800$^{circ}C$ was matched with Si in the range of 30-35wt% cordierite.
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