Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 14, Pages 15658-15663Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.07.021
Keywords
MgO-CaO refractories; Nano- and microZrO(2); Hydration resistance; Densification
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In this work the effect of nano- and microZrO(2) addition on the densification and hydration resistance of MgO-CaO refractories was investigated. 0, 2,4,6 and 8 wt% ZrO2 was added to MgO-CaO refractories that contain 35 wt% CaO. The crystalline phases and microstructure characteristics of specimens sintered at 1650 degrees C for 5 h in an electric furnace were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The physical properties are reported in terms of bulk density, apparent porosity and hydration resistance. Results show that with addition of ZrO2 the bulk density and hydration resistance of the samples increased while apparent porosity decreased. Also the hydration resistance of the samples was appreciably improved by the addition of ZrO2 due to its effect on decreasing the amount of free CaO in the refractories, promotion of densification as well as modification of the microstructure. Also it revealed that the nanoZrO(2) addition was more effective than microZrO(2) due to its higher activity. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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