Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Studies on the Fine Sintered Mullite(II)

파인 물라이트 소결체에 대한 연구(II)

  • 김경용 (한국과학기술연구원 정밀요업실) ;
  • 김윤호 (한국과학기술연구원 정밀요업실) ;
  • 강선모 (한국과학기술연구원 정밀요업실) ;
  • 김병호 (고려대학교 재료공학과) ;
  • 김석수 (고려대학교 재료공학과)
  • Published : 1989.05.01
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Abstract

Submicron high-purity mullite powder was prepared by a colloidal sol-gel route. Boehmite and silica were the starting materials. 2wt% $\alpha$-Al2O3 or ZrO2 was used as a seeding material. The gelled powder was calcined at 130$0^{\circ}C$ for 100min and attrition milled for 3hrs. The mullite powder obtained was composed of submicrometer and uniform particles with a narrow size distribution. It was hot-pressed at 1$600^{\circ}C$ for 1hr under 10MPa or was sintered at 1$650^{\circ}C$ for 4hrs. The bulk densities of the products made by both processes were 3.14 and 3.12g/㎤. the mechanical, thermal and electrical properties of the sintered mullite were characterized by bending strength, thermal expansion coefficient, thermal conductivity, dielectric constant and dielectric loss, etc.

Keywords

References

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