Effect of aluminum source on flexural strength of mullite-bonded porous silicon carbide ceramics
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概要
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In the present work, four aluminum sources (Al/AlN/Al2O3/Al(OH)3) were used to fabricate mullite-bonded porous SiC ceramics via reaction sintering in air at 1450°C and 1550°C for 1-6 h duration, and the role of aluminum source on microstructure and strength was estimated. The microstructures revealed a variation in necking and adhesion characteristics of SiC/mullite/silica grains. The porosity decreased and strength increased with sintering temperature or time for all specimens, except for the one prepared with Al2O3. Amongst the investigated, SiC ceramics prepared with Al2O3 exhibited the lowest porosity of 17% and highest specific strength of 19 kN.m/kg, while the usage of AlN rendered a combination of the highest porosity of 42% and lowest specific strength of 5 kN.m/kg. An attempt has been made to qualitatively explain the strength variation of prepared ceramics on the basis of contributing oxidation reactions towards mullitization.
著者
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Eom Jung-hye
Dep. Of Materials Sci. And Engineering The Univ. Of Seoul
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Kumar B.
Department of Materials Science and Engineering, the University of Seoul
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Eom Jung-Hye
Department of Materials Science and Engineering, the University of Seoul
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Kim Young-Wook
Department of Materials Science and Engineering, the University of Seoul
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HAN In-Sub
Energy Materials Research Center, Korea Institute of Energy Research
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WOO Sang-Kuk
Energy Materials Research Center, Korea Institute of Energy Research
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Woo Sang-kuk
Energy Materials Res. Center Korea Inst. Of Energy Res.
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Kim Young-wook
Department Of Materials Science And Engineering The University Of Seoul
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Han In-sub
Energy Materials Res. Center Korea Inst. Of Energy Res.
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Kumar B.
Department Of Botany Osmania University
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Eom Jung-hye
Department Of Materials Science And Engineering The University Of Seoul
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