科研之友
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摘要
In order to investigate the effect of TiO2 on densification and electrolyte corrosion resistance of MgO materials, light burned magnesia and a different amount of reagent grade TiO2(0-l0wt%) were well mixed firstly, and then the mixed powders were pressed into 920mm×20mm cylindrical samples under the pressure of 120 MPa before sintered at 1400, 1500 and 1600℃ for 3h in an electric arc furnace.The sintered samples were then immerged in molten fluoride electrolyte at 900℃ for 10 h to test the static corrosion resistance.The bulk density and apparent porosity of the sintered simples were determined by Archimedes draining method.The static corrosion rate of the sintered sirnples was determined by the weight loss method.And the phase composition and microstructure of the specimens after experiments were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM).The results show that the addition of TiO2 can markedly promote densification and grain growth of the MgO materials.The TiO2 is also beneficial to improve the corrosion resistance remarkably partially due to the formation of much denser structure in the TiO2 containing simples.Besides, Mg2TiO4 distributing along MgO grain boundary has a better corrosion resistance than magnesia, which is also favorable for improving corrosion resistance.
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