Preparation of porous SiC ceramics by an infiltration technique

The possibility of infiltration as a technique for synthesizing porous SiC ceramics was examined. SiC powder compacts were infiltrated with a liquid precursor which produced SiO 2 during pyrolysis in air at a low temperature. Infiltrated SiO 2 might act as a bond between the neighboring SiC particle...

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Bibliographic Details
Published in:Ceramics international 2011, Vol.37 (1), p.223-230
Main Authors: Dey, Atanu, Kayal, Nijhuma, Chakrabarti, Omprakash
Format: Article
Language:English
Subjects:
Ceramics
Cristobalite
Infiltration
Liquids
Porosity
Porous material
Powder compacts
Precursors
SiC Ceramics
Silica sol
Silicon carbide
Silicon dioxide
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Summary:The possibility of infiltration as a technique for synthesizing porous SiC ceramics was examined. SiC powder compacts were infiltrated with a liquid precursor which produced SiO 2 during pyrolysis in air at a low temperature. Infiltrated SiO 2 might act as a bond between the neighboring SiC particles at contacting points. The process parameters which control the rate of infiltration of liquid precursor to SiO 2 into porous SiC powder compacts were studied. Results showed that the infiltration rate could be estimated by using weight gain measurements. Sintering infiltrated bodies at 1300 °C yielded specimens in which only silicon carbide and cristobalite were detected. The presence of cristobalite significantly controlled the porosity as also the mechanical properties. Reasonable flexural strengths (∼ 48 MPa) could be achieved at a porosity level of 26 vol.% with near uniform pore diameter of around 5 μm.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2010.09.022