ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
C/C-SiC composites, namely carbon fiber reinforced silicon carbide and pyrocarbonmatrices, were fabricated in two steps in this study. Firstly, C/C composites were prepared by a rapideconomical densification process of chemical liquid-vaporized infiltration. PAN based felt and2-Dimensional carbon fibers were chosen as preform, respectively. A liquid hydrocarbon, kerosene,was used as a precursor. The C/C composites were processed in a temperature range of 900-1100ºCfor 150 minutes. Subsequently, C/C-SiC composites were fabricated from the C/C composites andsilicon powder by reactive melt infiltration method. Densities, open porosities of the C/C and theC/C-SiC composites were investigated. Structural properties of the C/C-SiC composites were studiedby optical microscopy. X-ray diffraction was used to identify the element and the crystal phase of thecomposites. It was shown that the density of C/C composite reached to 1.72 g/cm3 based on the 2Dcarbon fibers by CLVI method. Microstructure observation of the C/C composite revealed that thepyrocarbon is layer concentric around the fibers. It was found that during the RMI processing β-SiCwas formed through the reaction only between liquid silicon and pyrocarbon, while carbon fiber wasnot damaged. Free silicon remains in the C/C-SiC composites because of insufficient reaction withthe pyrocarbon
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.159.pdf
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