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

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)
Publication Information
Applied Chemistry for Engineering / v.16, no.5, 2005 , pp. 648-652 More about this Journal
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.
Keywords
$K^+$-beta-aluminas; attrition mill; zone-sintering; solid electrolyte; solid-oxide fuel cell;
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