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Rapid Sintering of Ceramics with Gradient Porous Structure by Asymmetric Thermal Radiation
Author(s) -
Li Duan,
Shen Zhijian
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13926
Subject(s) - materials science , sintering , silicon carbide , porosity , composite material , temperature gradient , graphite , ceramic , thermal , composite number , cylinder , thermal radiation , mechanical engineering , physics , quantum mechanics , meteorology , engineering , thermodynamics
In this study, thermal radiation was employed for sintering silicon carbide foams that achieved a gradient porous structure. The simultaneous use of graphite and carbon fiber reinforced carbon composite ( C f / C ) radiators resulted in an axial temperature gradient of ~600°C along the cylindrical sample, as confirmed by both numerical simulation and experimental measurement. By sintering the cylinder top at 1600°C for 5 min, the porous SiC body achieved an axial pore size gradient from ~106 ± 36 μm to ~250 ± 84 μm and an open porosity from 41.4 to 79.8 vol%. This work indicates the potential of sintering by intense thermal radiation technique for rapid manufacturing functionally graded materials through asymmetric assembly of thermal radiators.