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RISS 인기검색어
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- 저자 : Muksin (검색결과 3 건)
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Muksin,Yoon, D.H.,Raju, K. Ceramurgica ; Elsevier Science Ltd 2016 Ceramics international Vol.42 No.6
This study examined the effects of a Sc<SUB>2</SUB>O<SUB>3</SUB> sintering aid on the density, microstructure and mechanical properties of SiC-5vol% ZrB<SUB>2</SUB> composites prepared by hot-pressing. Microstructural studies showed that the addition of Sc<SUB>2</SUB>O<SUB>3</SUB> not only caused a decrease in the hot-pressing temperature from 1950 to 1750<SUP>o</SUP>C by liquid phase sintering, but also resulted in the formation of crystalline Sc<SUB>4</SUB>Zr<SUB>3</SUB>O<SUB>12</SUB> at the grain boundaries via a reaction with ZrO<SUB>2</SUB> on the surface of the ZrB<SUB>2</SUB> powder. The addition of Sc<SUB>2</SUB>O<SUB>3</SUB> produced a fine-grained microstructure with a 43% (430→615MPa) and 20% (3.6→4.3MPam<SUP>½</SUP>) increase in flexural strength and fracture toughness, respectively, compared to the SiC-ZrB<SUB>2</SUB> composite without Sc<SUB>2</SUB>O<SUB>3</SUB>.
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Joining of metal-ceramic using reactive air brazing for oxygen transport membrane applications
Raju, K.,Muksin,Kim, S.,Song, K.s.,Yu, J.H.,Yoon, D.H. Elsevier Ltd 2016 Materials & Design Vol.109 No.-
<P>This study examined the joining of dense Ce0.9Gd0.1O2 (-) (delta)-La0.6Sr0.4Co0.2Fe0.8O3 (-) (delta) (GDC-LSCF) ceramics to high temperature metal alloys for the fabrication of multilayered oxygen transport membrane (OTM) stacks. Reactive air brazing using a silver-based paste was performed at 1050 degrees C for 30 min in air to join GDC-LSCF/high temperature alloys, such as AISI 310S, Inconel 600 and Crofer 22 APU. The effects of the various filler materials, including CuO, GDC, LSCF, and GDC-LSCF mixture, in the Ag paste were also examined. The Ag-10 wt% CuO braze filler ensured in a reliable and compact joining without the formation of cracks and voids at the joining interface, while the addition of other ceramic fillers resulted in incomplete joining. Although none of the GDC-LSCF/metal alloy joints showed gas leakage at room temperature, the GDC-LSCF/Crofer joint only maintained the gas-tightness up to 800 degrees C under pressurized air up to 7 bars, which was explained by the microstructural rigidness of the oxide layer formed on the filler/alloy interface at high temperatures. This was supported by the minimal decrease in shear strength of the GDC-LSCF/Crofer joint, which was 91.1 and 88.3 MPa for the as-brazed and isothermally aged joint at 800 degrees C for 24 h in air, respectively. (C) 2016 Published by Elsevier Ltd.</P>
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Raju, K.,Muksin,Yoon, D.H. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.14
This paper reports the effectiveness of a Ag-10wt% CuO braze filler for the joining of dense Ce<SUB>0.9</SUB>Gd<SUB>0.1</SUB>O<SUB>2-δ</SUB>-La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3-δ</SUB> (GDC-LSCF) dual-phase ceramics for the oxygen transport membrane applications. Brazing was performed at 1050<SUP>o</SUP>C for 30min in air. The microstructure of the ceramic-filler-ceramic interfaces of the polished cross-sectional areas and the elemental distribution were examined. The results indicated that the Ag-10wt% CuO braze filler ensured reliable and compact joining without the formation of cracks and voids at the joining interface. The room temperature mechanical shear strengths were 59.3 and 40.2MPa for the as-brazed and isothermally aged joints at 800<SUP>o</SUP>C for 24h in air, respectively.
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