ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Reaction bonded silicon carbide (RB-SiC) was fabricated by phenol resin, starch, solidifiedagent and silicon powder through the following steps: first, carbonizing at high temperature for 7-9h,infiltrating silicon at 1450-1600oC for 0.5-2h, and then removing excessive silicon at 1700oC for 0.5h.Scanning electron microscopy and X-ray diffraction were employed to characterize and analyze themicrostructures and phase composition of the preforms and the final RB-SiC products. In addition, theeffect of carbonization temperature, the amount of starch and solidified agent on strength and apparentporosity of final RB-SiC were also discussed. The results showed that the carbonization process of phenolresin can be divided into three steps: at temperatures from 400oC to 600oC, the structure of polymerchanges less; at temperatures from 600oC to 1000oC, the fundamental chain of polymer is destroyed, andinverts to glass-like carbon; at temperatures from 1000oC to 1200oC, with the increasing of carbonizationtemperature, the structure of glass-like carbon changes into the structure of disorder graphite. And theincreased micro-pores could be obtained by adding starch
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1144.pdf
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