ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
SiC nanofibers were prepared by using polymer blend and melt-spinning techniques.Polycarbosilane (PCS) as a SiC precursor polymer was dispersed finely in novolac-phenolic resin(PF) as a carbon precursor polymer with a ratio of PCS/PF=3/7. The polymer blend was melt-spuncontinuously. The fibers were then soaked in an acid solution in order to stabilize them (to convertinto an infusible state) and finally heat-treated at 1000°C. The resulting fibers consisted ofPF-derived carbon matrix including elongated nanofibers derived from PCS. Finally, the fibers wereoxidized with nitric acid to remove the carbon matrix, and the released nanofibers were collectedwith a membrane filter. The resulting nanofibers were several 100 nm in diameter and 100 μm ormore in length. They were amorphous and contained a large amount of oxygen. A part of thenanofibers was further heated to 1500°C in a graphite tube resistance furnace, resulting incrystallization into β-SiC. The behaviors were quite similar to those of a commercially availableSiC fibers derived from PCS. In order to obtain optimum conditions, the processes were examined
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.51.60.pdf
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