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- 저자 : Kamrun Nahar Fatema (검색결과 2 건)
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The effect of ceramic fiber on the rheological and mechanical properties of porous Al2O3 ceramics
Kamrun Nahar Fatema,Hyung Mi Lim,Joung Sook Hong,Kee Sung Lee,Ik Jin Kim 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
Porous ceramics having oriented pores find widespread use in filtration, insulation, biomaterials, and catalysis. Because of theshape of the interconnected pores, porous alumina (Al2O3) ceramics synthesized via direct foaming have poor mechanicalstrength. The physical and mechanical characteristics of porous Al2O3 ceramics were systematically explored in this work bymodulating the microstructure and rheological properties by the inclusion of ceramic fibers. Because of the incorporation ofceramic fibers, the fiber-containing wall structure is generated in porous ceramics. The physical properties and mechanicalstrength of porous ceramics increase as the fiber content increases. To stabilize the wet foam and enhance the mechanicalproperties of the porous ceramics, ceramic fibers are added to the Al2O3 colloidal suspension. With 2.0 wt.% ceramic fibers,wet foam stability of 84% was obtained. Adequate addition of 2.0 wt.% ceramic fibers in the slurry may improve compressivestrength, however excess fibers reduce compressive strength. The load-bearing capacity and elastic modulus of sinteredsamples were determined using the Hertzian indentation method. The load-bearing capacity and elastic modulus increasedfrom 65.35 to 235.45 N and 28.52 to 270.75 MPa, respectively, as the ceramic fiber content increased from 0.5 to 3.0 wt.%.
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Zambaga Otgonbayar,Kamrun Nahar Fatema,Md Nazmodduha Rafat,Jihyeon Ryu,양선혜,Ick-Jun Kim,Won Chun Oh 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.5
The goal of this study was to analyse the impact of a combination of a sub-active material (KMnO 4 ) with surface modifi cation to the activated carbon surface for enhanced cathode performance. Activated carbon with ultra-specifi c surface area (USAC, TCK-PBM, 2560.4 m 2 /g) was used for the preparation of our composite with potassium permanganate (KMnO 4 ). The physical characteristics of this As-treated USAC sample were analysed through XRD, SEM and EDX analysis. The XRD analysis was used to examine structural properties; surface analysis undertaken by SEM; EDX analysis was used to measure the metal content of the sample as well as the content after treatment with KMnO 4 . It was shown USAC treated with KMnO 4 had more than a 10.5 μg acidic group by the Boehm titration method. The electrochemical properties of KMnO 4 -USAC were investigated for varying electrolyte concentration (0.1, 0.5, 1.2 and 6 M) at ambient temperature (25 °C) and the electrode showed great electrochemical performance after ten cycles.
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