Abstract:

The induction furnace dipping experimental method is used to simulate the  application condition on site． The phase composition，weight loss features under high temperatures and microstructure of carbon containing refractories after corroded by molten steel are investigated by means of analytical methods，such as XRD，SEM，TGA etc. The results show that in the stage of heating in the range from 20~1 300℃ the weight of MgO-C sample has been reduced all through, the total weight reduction is 1.142 7mg，occupying 16.93％ of its total mass，while the weight loss of Al2O3-MgO-C sample is less，the total weight loss is 0.441 4mg，occupying 6．45％ of its total mass. When heating temperatures range from 1 070~1 170℃, Al2O3-MgO-C sample has increased weight in small amount. The corrosion mechanisms of molten steel on MgO-C and Al2O3-MgO-C refractories are nearly same． Molten steel penetrates into the grain boundaries of major phases，generating many small holes at the boundaries and leaving intergranular and intragranular iron precipitation.