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Microstructure and Mechanical Properties of Al2O3-C Refractories Using Carbon Black and Multi-Walled Carbon Nanotubes as Carbon Sources
Y. W. Li1, N. Liao1, S. B. Sang1, H. Peng2
1 State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology. Wuhan 430081, China
2 Elkem silicon materials, P.O.Box 8126 Vaagsbygd, 4675 Kristiansand, Norway.
received January 5, 2015, received in revised form March 5, 2015, accepted March 12, 2015
Vol. 6, No. 3, Pages 207-214 DOI: 10.4416/JCST2015-00003
Abstract
Low-carbon Al2O3-C refractories were prepared using tabular alumina and reactive alumina powder as the main raw materials and silicon powder as an additive, while nano carbon black and multi-walled carbon nanotubes (MWCNTs) were added as nano carbon sources. The low-carbon Al2O3-C refractories were first fired at 800 °C, 1000 °C, 1200 °C and 1400 °C in a coke bed. Then the phase compositions and microstructures of the samples coked at the above temperatures were analyzed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Finally, the mechanical properties and thermal shock resistance of the samples were evaluated using three-point bending methods. The results showed that: 1) The mechanical properties of MWCNTs-containing Al2O3-C refractories coked above 1000 °C were significantly improved, which is attributed to the strengthening effects of MWCNTs and the formation of a large quantity of SiC whiskers via transformation of MWCNTs based on the Vapor-Solid model. 2) Thanks to the thermal stress absorption effect of nano carbon black, strengthening effects of MWCNTs and SiC whiskers, the low-carbon Al2O3-C refractories containing 1 wt% mixture of nano-carbon-black and MWCNTs achieved a similar residual strength ratio to those containing a 2 wt% mixture of nano carbon black and flaky graphite, exhibiting a higher residual strength.
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Keywords
Mechanical properties, thermal shock resistance, Al2O3-C refractories, nano carbon black, MWCNTs
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