Analysis on microcrystalline graphite and properties of MgO-C refractories with microcrystalline graphite

摘要

The composition and microstructure of microcrystalline graphite were studied by X-ray diffraction, differential thermal analysis-thermogravimetry, SEM and energy dispersive analysis in this paper. The chemical composition of ash in microcrystalline graphite was also analysed in the study. The microcrystalline graphite was introduced in MgO-C refractories fabrication to investigate the influence of microcrystalline graphite on the main properties of MgO-C refractories. The oxidation resistance, thermal shock resistance, hot bending strength and expansion rate of MgO-C samples with microcrystalline graphite and flake graphite were investigated in this study. It is indicated that the proper addition amount of microcrystalline graphite in MgO-C refractories should be no more than 4 wt-%.