文档介绍：Available online at
Ceramics International 36 (2010) 1837–1844
ate/ceramint
Development of mullite and spinel coatings on graphite for improved
water-wettability and oxidation resistance
. Ansar a, S. Bhattacharya b, S. Dutta a, . Ghosh a, S. Mukhopadhyay a,*
a Department of Chemical Technology, Calcutta University, 92 APC Road, Kolkata 9, India
b Calcutta Institute of Engg. and Management, 24/1A C. G. Road, Kolkata 40, India
Received 15 June 2009; received in revised form 24 February 2010; accepted 17 March 2010
Available online 29 April 2010
Abstract
Mullite and spinel forming sols were prepared from hybrid precursors having anic and anic origins. Refractory grade graphite
flakes were coated by these sols and their performances pared 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 interme