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RISS 인기검색어
- 검색키워드
- 저자 : Anwar Muhammad Shoaib (검색결과 3 건)
- 무료
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Anwar Muhammad Shoaib,Bukhari Syed Zaighum Abbas,Ha Jang-Hoon,Lee Jongman,송인혁 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
An electrically conductive mullite-bonded porous SiC-based Mn 3O4–Ni system was designed, which provided low-temperature sintering and excellent extrudability into complex shapes. Each designed composition contained kaolin (30 wt%) and Mn3O4 (10 wt%) as sintering aids. The combination of Ni (0–20 wt%) and sintering temperature (1100–1300 °C) regulated the electrical resistivity (5.5 × 10 7–3.4 × 10 –1 Ω cm) and flexural strength (33 ± 2–59 ± 3 MPa) of the sintered samples. Inter- face reactions formed secondary phases [e.g. nickel silicide (Ni 2Si) and manganese silicate (MnSiO 3)], which decreased the electrical resistivity. The in situ formation of mullite and an increased amount of Ni collectively improved the flexural strength. The sample with 15 wt% Ni sintered at 1200 °C in argon fl ow had a low electrical resistivity of 5.6 × 10 –1 Ω cm and a good flexural strength of 51 ± 4 MPa. The same composition was extruded to form a square honeycomb structure to verify the large-scale viability of the developed composition.
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Ahmad, Rizwan,Anwar, Muhammad Shoaib,Kim, Jae,Song, In-Hyuck,Abbas, Syed Zaighum,Ali, Syed Ahmad,Ali, Fahad,Ahmad, Jamil,Bin Awais, Hasan,Mehmood, Mazhar Elsevier 2016 CERAMICS INTERNATIONAL Vol.42 No.16
<P><B>Abstract</B></P> <P>Bimodal porous structures were prepared by combining conventional sacrificial template and partial sintering methods. These porous structures were analysed by comparing pore characteristics and gas permeation properties of alumina/mullite specimens sintered at different temperatures. The pore characteristics were investigated by SEM, mercury porosimetry, and capillary flow porosimetry. A bimodal pore structure was observed. One type of pore was induced by starch, which acted as a sacrificial template. The other pore type was due to partial sintering. The pores produced by starch were between 2 and 10µm whereas those produced by partial sintering exhibited pore size of 0.1–0.5µm. The effects of sintering temperature on porosity, gas permeability, and mullite phase formation were studied. The formation of the mullite phase was confirmed by XRD. Compressive strengths of 37.9MPa and 12.4MPa with porosities of 65.3% and 70% were achieved in alumina and mullite specimens sintered at 1600°C.</P>
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Electrospun YSZ/silica nanofibers with controlled fiber diameters for air/water filtration media
Lee Jongman,Ha Jang-Hoon,송인혁,Anwar Muhammad Shoaib 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.4
To develop electrospun ceramic nanofi bers as water/air fi ltration media, it is important to control the fi ber diameter. This is because the fi ber diameter of the electrospun ceramic nanofi bers determines the mean/largest pore sizes, and this governs the permeability and fi ltration effi ciency. Herein, the content (or concentration) of ceramic precursors and polymeric binders was adjusted in the electrospinning solution to control the fi ber diameter of electrospun yttria-stabilized zirconia (YSZ)/silica nanofi ber. This can infl uence the viscosity of the electrospinning solution and directly aff ect the fi ber diameter of the elec- trospun YSZ/silica nanofi bers through the electrospinning process. Increasing the content of ceramic precursors sequentially confi rmed that the fi ber diameter of electrospun YSZ/silica nanofi bers increases gradually. Conversely, adjusting the content of the polymeric binder could shift the overall distribution of the fi ber diameters. In other words, it is more eff ective to reduce the content of polymer binder than to reduce the content of ceramic precursors to manufacture smaller fi ber diameters. The polymer binder content plays a signifi cant role in promoting the mean/largest pore sizes and fi ltration effi ciency. The aim of this research was to develop the electrospun nanofi brous microfi ltration (MF) membranes or high-effi ciency particulate air (HEPA) fi lters for water/air remediation. To confi rm this hypothesis, the associated characterizations were conducted to evidence the superior fi ltration performances. For example, a rejection rate (%) of 99.5% (0.5 μm polymeric particles) and a fi ltration effi ciency of 99.9% (0.06 μm NaCl particles) were obtained to prove water and air fi ltration capacity, respectively.
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