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탄소열환원 공정을 사용한 다공질 탄화규소 세라믹스의 저온 제조공정
엄정혜,장두희,김영욱,송인혁,김해두,Eom, Jung-Hye,Jang, Doo-Hee,Kim, Young-Wook,Song, In-Hyuck,Kim, Hai-Doo 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.9
A low temperature processing route for fabricating porous SiC ceramics by carbothermal reduction has been demonstrated. Effects of expandable microsphere content, sintering temperature, filler content, and carbon source on microstructure, porosity, compressive strength, cell size, and cell density were investigated in the processing of porous silicon carbide ceramics using expandable microspheres as a pore former. A higher microsphere content led to a higher porosity and a higher cell density. A higher sintering temperature resulted in a decreased porosity because of an enhanced densification. The addition of inert filler increased the porosity, but decreased the cell density. The compressive strength of the porous ceramics decreased with increasing the porosity. Typical compressive strength of porous SiC ceramics with ${\sim}70%$ porosity was ${\sim}13 MPa$.
채수호,엄정혜,김영욱,송인혁,김해두,배지수,나상문,김승일,Chae, Su-Ho,Eom, Jung-Hye,Kim, Young-Wook,Song, In-Hyuek,Kim, Hai-Doo,Bae, Ji-Soo,Na, Sang-Moon,Kim, Seung-Il 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.1
A simple pressing process using zirconia and microbead for fabricating porous zirconia ceramics is demonstrated. Effects of microbead content and sintering temperature on microstructure, porosity, compressive and flexural strengths were investigated in the processing of porous zirconia ceramics using microbead as a pore former. By controlling the microbead content and the sintering temperature, it was possible to produce porous zirconia ceramics with porosities ranging from 43% to 70%. Typical compressive and flexural strength values at ${\sim}50%$ porosity were ${\sim}150\;MPa$ and ${\sim}35\;MPa$, respectively.
점토 광물 조성이 점토기반 분리막의 곡강도에 미치는 영향
이영일,엄정혜,김영욱,송인혁,Lee, Young-Il,Eom, Jung-Hye,Kim, Young-Wook,Song, In-Hyuck 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5
Clay-based membranes with submicron pore size were successfully prepared by a simple pressing process using low-cost starting materials(e.g., kaolin (K), bentonite (B), talc (T), and sodium borate). The green bodies were sintered at $1000^{\circ}C$ for 2 h in air. The effect of clay-mineral composition on the flexural strength of clay-based membranes was investigated. The porosity of the clay-based membranes could be controlled within the range of 34 - 42% by adjusting the starting composition. The flexural strength of the low-cost membranes depended on both the porosity and the ${\alpha}$-quartz content. In turn, the porosity and ${\alpha}$-quartz content were affected by the (B+T) /(K+B+T) ratio. The plot of strength relative to this ratio, showed a maximum when the ratio was 0.4. The typical flexural strength of these clay-based membranes (with ratio 0.4) was 28 MPa at 34% porosity.
첨가제의 조성이 폐유리-점토 타일의 곡강도에 미치는 영향
이영일,엄정혜,김영욱,송인혁,Lee, Young-Il,Eom, Jung-Hye,Kim, Young-Wook,Song, In-Hyuck 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
Cullet-loess tile bodies are successfully fabricated using cullet, loess, hollow microspheres, and sintering additives (borosilicate glass frit, boric acid, or fumed silica) as starting materials. The effects of the additive composition and sintering temperature on the sintered density and flexural strength of the cullet-loess tile bodies are investigated. The sintered density of the cullet-loess tile bodies increases with an increase in the sintering temperature as a result of the enhanced densification of pore walls through the viscous flow of a liquid phase formed from the glass frit and sintering additives. The flexural strength of the cullet-loess tile bodies increases with increases in the sintering temperature and the cullet content in the starting composition. A maximal flexural strength of 40 MPa is obtained in cullet-loess tile bodies sintered with glass frit at $800^{\circ}C$ in air.