Phase behavior analysis of MgO-C refractory at high temperature: Influence of Si powder additives

摘要

Phase changes of Si powder in the MgO-C refractory were investigated in a reducing atmosphere system at 1500 degrees C. The phase compositions, morphology and microstructures of the products were determined using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (FIRTEM) and energy dispersive spectroscopy (EDS). beta-SiC nanowires were synthesized in the pores of MgO-C bricks without the assistance of catalysis. The synthesized nanowires were typically a few hundred nanometers to several micrometers in length. The formation process was governed by VS mechanism. The formed beta-SiC nanowires may help to reinforce the mechanical properties and enhance the antioxidation properties of MgO-C bricks. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.