Densification Study of K+-beta-aluminas Prepared from Their Ultra-fine Milled Powder

초미세 분쇄 분말로 제조된 K+-beta-aluminas의 치밀화 연구

  • Shin, Jae-Ho (Department of Materials Chemistry and Engineering, Konkuk University) ;
  • Kim, Woo-Sung (Department of Materials Chemistry and Engineering, Konkuk University) ;
  • Lim, Sung-Ki (Department of Materials Chemistry and Engineering, Konkuk University)
  • 신재호 (건국대학교 신소재공학과) ;
  • 김우성 (건국대학교 신소재공학과) ;
  • 임성기 (건국대학교 신소재공학과)
  • Received : 2005.03.18
  • Accepted : 2005.07.18
  • Published : 2005.10.10

Abstract

A super ionic conductor, $K^+$-beta-aluminas, which is known to be difficult to obtain in the form of dense sintered density under atmospheric pressure, was pulverized to 350 nm mean particle size using attrition mill. The sample were pressed into tablet form by uniaxial pressing. The specimen was sintered under atmospheric pressure in powder form. Sintering temperature range was $1400^{\circ}C$ to $1650^{\circ}C$ at $50^{\circ}C$ intervals. Additionally, zone sintering was carried out to control the growth grain at high temperature ($1600^{\circ}C$). The density of specimens that were sintered at $1600^{\circ}C$ and $1650^{\circ}C$, and sintered at $1600^{\circ}C$ by zone sintering were about 93% and 95%, respectively. In the case of the lengthened sintering time to 2 h, the density of specimen was reduced to lower than 90%, since the particles were grown to the duplex microstructure.

Acknowledgement

Supported by : 건국대학교

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