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:
Oxidation resistant SiC coating for graphites was prepared by a pack cementation process withmixture powders of Si, C, SiC and some infiltration additives containing MgO, Al2O3 and Cr2O3. Theinfluence of different infiltration additives on the phase, microstructure and oxidation resistance of SiCcoating was primarily investigated. The results showed that adding infiltration additive in the packpowders is helpful for depositing denser SiC coating on graphite substrate; and the coating prepared byusing MgO as infiltration additive exhibited better oxidation resistance at high temperature. XRDanalyses revealed that SiC coating prepared by adding of MgO as infiltration additive possessed more freesilicon; and the SEM analyses displayed that the free silicon could effectively fill the small holes of theSiC coating, which resulted in a perfect dense surface structure of SiC coating. Oxidation test showed thatthe as-prepared SiC coating could effectively protect graphite materials at 1500oC for 200 hours and thecorresponding weight loss of the coated graphite was only 0.13%
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1756.pdf
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