ISSN:
1662-9752
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:
Porous C/C composite with certain porosity prepared by Chemical vapor infiltration(CVI) was chosen as the preforms to develop the C/C-SiC composites through precursor infiltrationand pyrolysis(PIP), using PCS (polycarbosilane) as the precursor and divinylbenzene as solvent andcross-linking reagent for PCS. The effect of the infiltration solution with different PCS/DVB ratio onthe final density, microstructure, and mechanical properties of composites was investigated and theproper PCS/DVB ratio to prepare the C/C-SiC composites was suggested. The experimental resultsshowed that the final densities and the mechanical properties of the composites were close related tothe PCS/DVB ratio. Higher PCS/DVB ratio resulted in higher final density and better mechanicalproperties, but not the highest PCS/DVB ratio could get the best mechanical properties. The mainreason is that too high PCS/DVB ratio will make the infiltration process become difficult and lead tothe formation of lots of pores in the final composite, at last lowers the mechanical properties. It isbelieved that the 50% PCS content is proper to prepare the C/C-SiC composites. The composite from50% PCS infiltration solution could get the final density of1.696g/cm3, the flexural strength of171Mpa, and shearing strength of 21.6Mpa, which are the best mechanical results among the obtainedmaterials
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1501.pdf
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