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한현근 ( Hyun Guen Han ),이종국 ( Jong Kook Lee ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
Porcelain ceramics by mixing recycled waste ceramic raw materials and normal ceramic raw materials were prepared to reduce the manufacturing cost. The waste ceramic raw materials were recycled by crushing and ball milling waste porcelain bodies. The mean particle size of recycled ceramic raw material after milling was 22 ~ 40 ㎛ with irregular shape and narrow particle size distribution. Shrinkage and sintered density of compacts obtained from recycled ceramic batch composition increased with increasing sintering temperatures. However, the sintered density was independent on the amount of the recycled ceramic raw materials. The batch composition containing 30% of recycled ceramic raw materials showed the highest sintered density. Sintered density decreased over the temperature of 1200℃ due to the presence of cracks on surface and in bulk.
지오폴리머 시멘트를 이용한 콘크리트 표면의 패각 분말 코팅
김갑중,한현근,서동석,이종국,Kim, Gab-Joong,Han, Hyun-Geun,Seo, Dong-Seok,Lee, Jong-Kook 한국재료학회 2010 한국재료학회지 Vol.20 No.1
Geopolymer materials are attractive as inorganic binders due to their superior mechanical and eco-friendly properties. In the current study, geopolymer-based cement was prepared using aluminosilicate minerals from fly-ash with KOH as an alkaline-activator and $Na_2SiO_3$ as liquid glass. Then, calcium carbonate powder from a clam shell was mixed with the geopolymer and the mixture was coated on a concrete surface to provide points of attachment for environmental organisms to grow on the geopolymers. We investigated the effect of the shell powder grain size on the microstructure and bonding property of the geopolymers. A homogeneous geopolymer layer coated well on the concrete surface via aluminosilicate bonding, but the adhesiveness of the shell powder on the geopolymer cement was dependent on the grain size of the shell powder. Superior adhesive characteristics were shown in the shell powder of large grain size due to the deep penetration into the geopolymer by their large weight. This kind of coating can be applied to the adhesiveness of eco-materials on the surface of seaside or riverside blocks.
황규홍,한현근,김상우,이종국 조선대학교 생산기술연구소 2007 生産技術硏究 Vol.29 No.1
As increasing the porcelain as a home ware, the amount of waste porcelain is increased in factory or at home every year. It is very important to recycle the waste porcelain from environmental and economic point if views. Recycling of porcelain body to batch composition can be reduced the manufacturing cost of porcelain by production of raw materials and dropping of sintering temperature about 150~200℃. In this study, we prepared porcelain ceramics by mixing recycled waste ceramic raw materials and normal ceramic raw materials. The waste ceramic raw materials were recycled by crushing and ball milling waste porcelain bodies. The recycled ceramic raw materials after milling have a mean particle size about 22-40 ㎛ with irregular shape and narrow particle size distribution. Shrinkage and sintered density of compacts from recycled ceramic batch composition increased with increasing sintering temperatures, however the sintered density was independent on the amount of the recycled ceramic raw materials. The batch composition containing 30% of recycled ceramic raw materials showed the highest sintered density. Sintered density was decreased over the temperature of 1200℃ due to the creation of cracks on surface and in bulk. It may be concluded that sintering temperature can be reduced in the processing of porcelain body by adding of recycled ceramic raw matehals to normal batch composition.