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유기용매의 사용없이 알콕사이드로부터 코디어라이트 분말제조
류수착,김호룡,김겸,박희찬,Ryu, S.C.,Kim, H.R.,Kim, K.,Park, H.C. 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.3
Cordierite powders were prepared by controlled hydrolysis of metal alkoxides with catalysts in water medium without using organic solvents. Water was adjusted to a certain pH by HC1 and NH4OH. $\alpha$-Cordierite powder was prepared from aluminum isopropoxide, tetraethyl orthosilicate and magnesium ethoxide mixed with water adjusted to pH of 3. At water pH of 11, $\alpha$-cordierite, mullite and $\beta$-quartz phases were coexisted. The powders were freeze dried, calcined and then fired at different temperatures. The characteristics of powders were examined by means of DTA, X-ray diffraction, FT-IR, and electron microscopy. It was found that $\alpha$-cordierite could be synthesized at temperature of 120$0^{\circ}C$ from the powders prepared by alkoxides with water medium without organic solvents.
용융 열처리한 PMMA/Alumina 복합체의 기계 특성
김동준 ( D. J. Kim ),류수착 ( S. C. Ryu ) 한국열처리공학회 2018 熱處理工學會誌 Vol.31 No.3
The PMMA composited material mixed with alumina studied to find the optimal condition, the ade-quate ratio of mixing, for the associated mechanical properties such as anti-corrosive, weatherproof perfor-mance. The 80% of hardness and 52% of scratch coefficient improved according to increasing ratio of alumina, which is mostly 3 times higher than that of pure PMMA, on other hand 16% of tensile strength and 35% of flex-ural strength has lost while alumina was adding in. The most proper ratio, having the best availability in substan-tial production, of composite between pure PMMA and alumina is determined as 93 wt. % vs 7 wt. %. Results of related five properties had estimated by using of a pentagram. (Received April 25, 2018; Revised May 3, 2018; Accepted May 10, 2018)