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http://dx.doi.org/10.4191/KCERS.2004.41.7.518

Pore Structure Modification and Characterization of Porous Alumina Filter with Chemical Vapor Infiltration (CVI) SiC Whisker  

박원순 (연세대학교 세라믹공학과)
최두진 (연세대학교 세라믹공학)
김해두 (한국기계연구원 세라믹재료그룹)
Publication Information
Journal of the Korean Ceramic Society / v.41, no.7, 2004 , pp. 518-527 More about this Journal
Abstract
In this study, SiC whiskers were grown in porous alumina substrate in order to enhance the filtering efficiency, performance, and durability by controlling pore morphology. This experiment was performed by Chemical Vapor Infiltration (CVI) in order to obtain the whiskers on the inside of pores as well as on the surface of porous the A1$_2$O$_3$ substrate. The deposition behavior was changed remarkably with the deposition position, temperature, and input gas ratio. First, the mean diameter of whisker was decreased as the position of observation moved into the inside of substrate due to the reactant gas depletion effect'. Second, the deposition temperature caused the changes of the deposition type such as debris, whiskers and films and the change in morphology affect the various properties. When SiC films were deposited. the gas permeability and the specific surface area decreased. However, the whisker showed the opposite result. The whiskers increase not only the specific surface area and minimizing pressure drop but also mechanical strength. Therefore it is expected that the porous alumina body which deposited the SiC whisker is the promising material for the filter trapping the particles.
Keywords
Chemical Vapor Infiltration (CVI); SiC; Whisker; Pore structure;
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