Damage analysis of Si3N4 bonded SiC bricks for bustle pipes of OY shaft furnaces
To investigate the damage of Si3N4 bonded SiC bricks for the bustle pipe of OY reduction shaft furnaces,samples were taken from bricks that had been in service for two years.The appearance,phase composition,microstructure and element composition of the samples were analyzed.The results indicate that:(1)the used bricks show obvious erosion,with rough erosion surfaces and the erosion rate of 50％;(2)the bulk density and apparent porosity of the used bricks decrease,and the oxidation degree decrea-ses with the increase of the distance from the working face;(3)Si3N4 bonded SiC bricks are oxidized by the gas in the OY furnaces to form SiO2,which are not suitable as the lining materials for the bustle pipe of shaft furnaces.
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