| Thermomechanical Characteristics of Low Carbon
Magnesia-Based Monolithic Refractory Containing
Nanostructured Surface-Modified Graphites in Matrix |
S. Mukhopadhyay,* A. Saha, S. Chatterjee and S. Ghosh
Pages : 118-127
DOI : 10.1080/0371750X.2017.1281765 |
| Abstract |
| This study has been carried out on castable and matrix of a magnesia-based unshaped
refractory system containing respectively 5.0% and 20.0% graphites. The graphite has
been incorporated either as uncoated or surface-modified form, the latter containing a
thin sol-gel calcium aluminate film over graphite surface. Surface modification of graphite
has been confirmed by scanning electron microscopy, X-ray diffraction, Raman spectra,
Fourier transformed infrared study and some other experiments. The sol-gel coating
improved hydrophilicity and oxidation resistance of graphite. Sinterability, thermal and
thermomechanical properties of castable matrices have been elaborately documented.
From this work it is apparent that presence of coated graphite in matrix part of basic
castable is not that encouraging as observed in alumina-carbon system. However, the
castable properties as a whole are satisfactory due to protection of graphite and its less
water demand for casting.
[Keywords: Refractories, Thermomechanical analysis, Magnesia, Graphite, Electron
microscopy, Spinel, Sintering, X-ray diffraction] |
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