ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Nanoscaled Cr2O3 powders coated on alumina particles have been produced by means ofmetal organic chemical vapor deposition (MOCVD) in a fluidized bed, using the pyrolysis ofCr(CO)6 precursor. In order to prepare the nanoscaled Cr3C2 powder from the Cr2O3, carbonizingbehavior of the Cr2O3 particles was investigated. The carbon is from the decomposition ofCr(CO)6. It was found that Cr2O3 transformed into Cr3C2 at 1150 oC in graphite furnace in avacuum level of 10-4 torr, while it could not carbonize at 1150oC in a vacuum level of 100 torr. Inthe present study, two reactions for Cr2O3 are carried out. One is that Cr2O3 reacts with Al2O3 toform a solid solution; the other is that Cr2O3 reacts with carbon to transform into chromiumcarbide. Consequently, a nanocomposite comprising the matrix of solid solution of Al2O3 - Cr2O3and second phase Cr3C2 was prepared after hot-pressed
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.351.93.pdf
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