Papers by Keyword: MgO-C Refractory

Abstract: In this paper, the phase compositions and microstructure of MgO-C samples containing Si powder in N₂ sintered at 1350-1500°C were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The α-Si₃N₄, β-Si₃N₄, MgSiN₂ and SiC phases have formed together with MgO and C phases in the sintered samples. The morphologies of β-Si₃N₄ crystals were almost in the shape of rod-like through the α-β phase transformation of Si₃N₄ by Mg-Si-O-N and silicon liquid. The morphologies of α-Si₃N₄ crystals were in the shape of equiaxed. The morphology of MgSiN₂ crystals was in the shape of polyhedron with the size of 5 μm.

Abstract: Today due to the unique properties of magnesia carbon refractories, the iron and steel industries are of special interest. Therefore, it is important to extend the life of the refractory. The effect of calcined alumina and nanocarbon on the mechanical strength and corrosion resistance against slag refractories magnesia carbon has been studied. Mechanical strength of cold crushing strength (CCS) was measured according to ASTM C0133-97R03 numbers. The bulk density (BD) and apparent porosity (AP) were determined respectively, relative to the size and weight measured using Archimedes method according to ASTM C0020-00R05 numbers and corrosion resistance against slag shrub procedure. Samples prepared at cylinder 50×50 mm were tempered on 250 °C for three hours. The corrosion resistance of the samples cocked on 1350 °C for two hours under reducing atmosphere (coke bed) was evaluated. During the review process of characterization methods, XRD, SEM-EDX has been used. The results showed that the properties improved.