Abstract
Dense γ-Y2Si2O7 ceramics were prepared by moulding and sintering of pure γ-Y2Si2O7 powders synthesized by adding various additives. Effects of sintering additives on hot corrosion behavior of γ-Y2Si2O7 ceramics in Na2SO4 + V2O5 molten salts were systematically investigated. Chemical kinetics of corrosion process was also calculated to illuminate the influence of different additives on chemical stability. Results showed that corrosion reaction started at grain boundary due to the loose microscopic network. When the intercrystalline glass phase was completely etched, the molten salts began to contact Y2Si2O7, forming NaY9Si6O26 and YVO4. Compared with Li2O and MgO, intercrystalline glass phase formed by Al2O3 additive had the most compact microscopic network structure, leading to the best chemical stability. Apparent activation energy for hot corrosion reaction of γ-Y2Si2O7 ceramics in pure Na2SO4, Na2SO4 + 5 wt% V2O5, Na2SO4 + 10 wt% V2O5, Na2SO4 + 15 wt% V2O5 molten salts was calculated to be 408.16, 373.60, 310.62, and 249.63 kJ/mol, respectively.
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