Preparation and Characterization of Catalyst-Containing SiC Fiber Filter Media

Fiber reinforced titanium alloys hold immense potential for applications in the aerospace industry. However, chemical reaction between the fibers and the titanium alloys at fabrication temperatures leads to the formation of brittle reaction products which limits their development. In the present study, coated SiC fibers have been used to evaluate the effects of surface coating on the reaction zone in the SiC/IMI829 system.IMI829 (Ti-5.5A1-3.5Sn-3.0Zr-0.3Mo-1Nb-0.3Si), a near alpha alloy, in the form of PREP powder (-35 mesh), was used a茸 the matrix. CVD grown AVCO SCS-6 SiC fibers were used as discontinuous reinforcements. These fibers of 142μm diameter contained an overlayer with high Si/C ratio on top of an amorphous carbon layer, the thickness of the coating being ∽ 1μm. SCS-6 fibers, broken into ∽ 2mm lengths, were mixed with IMI829 powder (representing < 0.1vol%) and the mixture was consolidated by HIP'ing at 871°C/0. 28GPa/4h.

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Pore formation in carbon-coated ceramic fiber filter media

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2004.04.037 ◽

2004 ◽

Vol 241 (1-3) ◽

pp. 185-190 ◽

Cited By ~ 4

Author(s):

J.C Lee ◽

Hee J You ◽

Hee S Lee ◽

Min C Shin ◽

Jin S Cha ◽

...

Keyword(s):

Pore Formation ◽

Ceramic Fiber ◽

Filter Media ◽

Carbon Coated ◽

Fiber Filter

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Preparation and Characterization of Porous Si-Coated SiC Fiber Media

Materials Science Forum ◽

10.4028/www.scientific.net/msf.449-452.233 ◽

2004 ◽

Vol 449-452 ◽

pp. 233-236 ◽

Cited By ~ 1

Author(s):

Jun Suh Yu ◽

B.S. Lee ◽

Sung Churl Choi ◽

Ji Hun Oh ◽

Jae Chun Lee

Keyword(s):

Electrical Conductivity ◽

Silicon Content ◽

Porous Si ◽

Electrically Conductive ◽

Electrode Distance ◽

Sic Fiber ◽

Effective Electrical Conductivity ◽

The One ◽

Fiber Preforms

Electrically conductive porous Si/SiC fiber media were prepared by infiltration of liquid silicon into porous carbon fiber preforms. The series rule of mixture for the effective electrical conductivity was applied to the disc shaped samples to estimate their silicon content, effective electrical conductivity and porosity. The electrical conductivity was estimated by assuming the disc sample as a plate of equivalent geometry, i.e., same thickness, electrode distance and volume. As the volumetric content of silicon in a sample increases from 0.026% to 0.97%, the estimated electrical conductivity increases from 0.17 S/cm to 2.09 S/cm. The porosity of the samples measured by Archimedes principle was in the range of 75~83% and 1~4% less than the one estimated by the series rule of mixture for the effective electrical conductivity.

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