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Development of mullite and spinel coatings on graphite for improved water-wettability and oxidation resistance
SK A ANSAR, S BHATTACHARYA, , S S GHOSH,
Published in ELSEVIER SCI LTD
2010
Volume: 36
   
Issue: 6
Pages: 1837 - 1844
Abstract
Mullite and spinel forming sols were prepared from hybrid precursors having both organic and inorganic origins. Refractory grade graphite flakes were coated by these sols and their performances were compared in terms of oxidation resistance and water-wettability. Particle size distribution, structural evolution and related characteristics of both mullite and spinel gels have been investigated by dynamic light scattering (DLS), differential thermal analysis (DTA), X-ray diffraction (XRD) and infrared spectra (IR) studies. Coated graphites have also been studied by IR and XRD tests along with scanning electron microscopy (SEM) with energy dispersive spectral (EDS) analysis. The better performance of spinel coated graphite was confirmed. The mechanism of spinel formation on graphite was suggested to take place via intermediate gamma alumina phase formation from boehmite sol. It was clarified by DLS, XRD and microstructural analysis of dried and calcined gels. © 2010 Elsevier Ltd and Techna Group S.r.l.
About the journal
JournalData powered by TypesetCeramics International
PublisherData powered by TypesetELSEVIER SCI LTD
ISSN0272-8842
Open AccessNo