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손세구,이지현,이정미,김영도,Son, Se-Gu,Lee, Ji-Hyeon,Lee, Jeong-Mi,Kim, Young-Do 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.7
Willemite ($Zn_2SiO_4$) are a wide range of applications such as a phosphor host and an important crystalline phase in glass ceramics, electrical insulators, glazes, and pigments. In this study, Willemite precursors were synthesized with zinc silicate gels from mixture of zinc nitrate solution and various sodium silicate solution by the geopolymer technique. To examine the crystallization behavior, precursors were have been monitored by the XRD. A pure willemite phase was obtained at $900^{\circ}C$. TEM investigations revealed that the sample with 50 nm particle size was obtained via heat-treated at $900^{\circ}C$ for W-3.
Geopolymer Technique에 의한 Mullite 분말의 합성
손세구,이지현,이정미,김영도,Son, Se-Gu,Lee, Ji-Hyeon,Lee, Jeong-Mi,Kim, Young-Do 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.5
Mullite precursors were synthesized with aluminosilicate gels from mixture of aluminum nitrate and sodium orthosilicate by the geopolymer technique at ambient temperature. Then, the gel was heat-treated in air up to $1200^{\circ}C$ at intervals of $100^{\circ}C$. Raw and heat-treated gels were characterized by TG-DTA, XRD, FTIR, $^{29}Si$ MAS-NMR, TEM. The result to examine the crystallization of behavior though DTA, the synthesized precursors were crystallized in the temperature range from $950^{\circ}C$ to $1050^{\circ}C$. The XRD results showed that the gel compositions were begun to crystallize at various temperature. Also, it was found that the precursors of M-4 begun to crystallize at about $950^{\circ}C$. The M-4 XRD peaks were characterized better than $M-1{\sim}M-3$ at $1000^{\circ}C$. The formation temperature of mullite in this study is much lower than that of previous sol-gel methods, which crystallized at up of $1200^{\circ}C$. TEM investigations revealed that the sample with 10 nm particle size was obtained via heat-treated at $1000^{\circ}C$ for M-4.
Properties of the Alumino-Silicate Geopolymer using Mine Tailing and Granulated Slag
손세구,김영도,이우근,김경남 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.5
In this study, the physical characteristics of alumino-silicate geopolymer and the role of mine tailings in alumino-silicate geopolymer were investigated using mine tailings, coal fly ash, granulated blast furnace slag and alkali activator solution. The reaction products of alumino-silicate geopolymer using mine tailings are amorphous aluminosilicate gel and calcite, and are increased with decreasing the addition of mine tailings. The compressive strength of MRG-2 specimen is the highest as 142.2 MPa. The compressive strength of specimen adding mine tailings is decreased, as curing days are increased. When curing days are same, the compressive strength is decreased, as mine tailings is added more. The compressive strength of alumino-silicate geopolymer manufactured by adding mine tailings is higher than that of portland cement mortar, when cured for 28 days. The leaching resistance of heavy metal ion in alumino-silicate geopolymer is lower than the toxic threshold of each ion. It is confirmed that heavy metals are stabilized and fixed in alumino-silicate geopolymer.
ZnO 바리스터의 미세구조와 전기적특성에 미치는 ${ZnAl_2}{O_4}$의 영향
손세구,김경남,한상목 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.4
Microstructueral development and electrical properties in ZnO-Bi2O3-ZnAl2O4 system were investigated with ZnAl2O4 content(0.1~1.0 mol%). The shrinakge of specimens started around $700^{\circ}C$ and finished at 110$0^{\circ}C$, reaching a maximum shrinkage rate at 80$0^{\circ}C$. The shrinkage rate is strongly related to the fromation of a Bi-rich liquid. The increase of the ZnAl2O4 content inhibited the grain growth of ZnO. Most of ZnAl2O4 particles located at the grain boundaries were about 2~3${\mu}{\textrm}{m}$. ZnO grain size changed little up to 110$0^{\circ}C$, but increased markedly above 115$0^{\circ}C$, especially at lower ZnAl2O4 content. Drastic decreasing in breakdown voltage(Vb) with increasing temperature is expected to be dependent on the ZnO grain size and the distribution of the largest grains between the electrode. The nonlinear I-V characteristic was significantly influenced by the ZnAl2O4 content, which exhibited a maximum value at about 15${\mu}{\textrm}{m}$ of ZnO grain size.
저급규석을 활용한 Fly Ash 지오폴리머 모르타르 제조 및 특성
손세구,홍승엽,김영도,Son, Se-Gu,Hong, Seung-Yeob,Kim, Young-Do 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.7
This paper indicates the investigation about the development of ET (Environmental Technology) industrial geopolymeric materials from mixture silica mine waste, coal fly ash and alkali activator solution (sodium silicate) by the geopolymer technique at ambient temperature. The results showed that higher compressive strength of geopolymeric mortar increased with a reduce of L/S ratio and increased along with an increase of coal fly ash content. The compressive strengths of geopolymer mortar on low silica of C Silica Mine and K Silica Mine are 18.7 MPa, 20.4 MPa, respectively. Compressive strength of geopolymeric mortar depends on L/S ratio and coal fly ash content added.. Additionally, scanning electron microscope (SEM) techniques are used to characterize the microstructure of the geopolymeric mortars. SEM observation shows that it is possible to have amorphous aluminosilicate gel within mortar. XRD patterns indicate the fact that geopolymeric mortar is composed of amorphous aluminosilicate phase, calcite and quartz.