Application feasibility of sintered chrome-corundum in ceramic electric melting furnaces
To analyze whether sintered chrome-corundum materials meet the requirements of the corrosion resistance of ceramic electric melting furnaces against borosilicate glass,the corrosion behaviours of simu-lated high level radioactive liquid waste vitrified glass to two sintered chrome-corundum refractories with different Cr2O3 contents(47.3％and 60.9％,by mass)at 1 200 ℃ through the rotary impregnation method were compared and investigated.The microstructure and phase composition of the two chrome-corundum refractories after the corrosion tests were analyzed.The results indicate that:(1)the sintered chrome-corundum refractories exhibit excellent corrosion resistance against the simulated molten glass,while show-ing a discontinuous corrosion process of matrix corrosion-grain spalling;(2)molten glass mainly infiltrates through the pores and phosphate phases between(Cr,Al)2O3 solid solution in the sintered chrome-corun-dum refractories;whereas Al2O3 of(Cr,Al)2O3 solid solution diffuses into the molten glass,and MgO,FeO,Fe2O3,etc.diffuse from the molten glass into(Cr,Al)2O3 solid solution,forming Al2O3-poor composite spi-nel;(3)the sample with 60.9％Cr2O3 has slightly worse corrosion resistance than the one with 47.3％Cr2O3,because the poor solid solubility of(Cr,Al)2O3 solid solution,and the poor direct bonding of phos-phate binders and(Cr,Al)2O3 solid solution matrix with Al2O3 as well as Cr2O3 particles worsen the corro-sion resistance of the sample;(4)if the bonding strength between matrix and particles of sintered chrome-corundum refractories is enhanced,forming similar structures as fused materials,the problem of discontinu-ous corrosion in molten glass will be solved,the corrosion resistance against molten glass will be im-proved,and the refractories are potential to be applied in ceramic electric melting furnaces.
ceramic electric melting furnacessintered chrome-corundumsimulated high level radioactive liquid waste vitrified glasscorrosion resistance
万方数据
维普
