Effect of nanocarbon sources on microstructure and mechanical properties of MgO–C refractories |
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Authors: | Tianbin Zhu Yawei Li Shaobai Sang Shengli Jin Yuanbing Li Lei Zhao Xiong Liang |
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Affiliation: | 1. The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology, 430081 Wuhan, PR China;2. Chair of Ceramics, University of Leoben, Peter-Tunner-Straße 5, 8700 Leoben, Austria |
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Abstract: | A study of microstructural evolution, mechanical and thermo-mechanical properties of MgO–C refractories, based on graphite oxide nanosheets (GONs), carbon nanotubes (CNTs) and carbon black (CB), was carried out by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), three-point bending and thermal shock tests. Meanwhile, these results were compared to the conventional MgO–C refractory containing 10 wt% flaky graphite prepared under the same conditions. The results showed that higher cold modulus of rupture was obtained for the composition containing GONs, and the composition containing CNTs exhibited larger displacement after coking at 1000 °C and 1400 °C. Also, the addition of nanocarbons led to an improvement of the thermal shock resistance; in particular, both compositions containing CNTs and CB had higher residual strength ratio, approaching the thermal shock resistance of the reference composition containing 10 wt% flaky graphite, as it was associated with the presence of nanocarbons and in-situ formation of ceramic phases in the matrix. |
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Keywords: | C Mechanical properties C Thermal shock resistance Nanocarbons MgO&ndash C refractories |
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