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http://dx.doi.org/10.4191/KCERS.2011.48.2.168

Effect of Mullite Generation on the Strength Improvement of Porcelain  

Choi, Hyo-Sung (Whiteware Ceramic Center, KICET)
Pee, Jae-Hwan (Whiteware Ceramic Center, KICET)
Kim, Yoo-Jin (Engineering Ceramic Center, KICET)
Cho, Woo-Seok (Whiteware Ceramic Center, KICET)
Kim, Kyeong-Ja (Whiteware Ceramic Center, KICET)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.2, 2011 , pp. 168-172 More about this Journal
Abstract
Alumina powder was added in a general porcelain (Backja) with clay, feldspar and quartz contents to promote the mullite ($3Al_2O_3{\cdot}2SiO_2$) generation in the porcelain. Low melting materials ($B_2O_3(450^{\circ}C)$, $MnO_3(940^{\circ}C)$, CuO($1080^{\circ}C$)) were doped at ~3 wt% to modify the sinterability of porcelain with a high alumina contents and promote the mullite generation. Green body was made by slip casting method with blended slurry and then, they were fired at $1280^{\circ}C$ for 1hr by a $2^{\circ}C/min$. Densifications of samples with high alumina contents (20~30 wt%) were impeded. As the doping contents of low melting materilas increased, the sinterability of samples was improved. The shrinkage rate and bulk density of samples were improved by doping with low melting materials. Mullite phase increased with increasing the low melting contents in the phase analyses. This means lots of alumina and quartz were transformed into mullite phase by low melting contents doping. In the results, high bending strength of samples with high alumina contents was accomplished by improving the densification and mullite generation in the porcelain.
Keywords
Mullite; High strength; Flux materials; Densification; Alumina powder;
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Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By SCOPUS : 1
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