Permeability of refractory castables at high temperatures

Temperature is an important factor affectng the permeation of fluids in ref ractory castables. Because of experimental difficulties, however, permeabil ity parameters are usually obtained at room temperature and then extrapolat ed to the temperature of interest, with no concern regarding porous structu re modification (thermal expansion, etc.). In this work, an apparatus has b een developed to evaluate the air-flow permeability of refractory castables at temperatures up to 800 degreesC. The objective is to investigate modifi cations in the permeability constants obtained by Forchheimer's equation to provide a more realistic relationship with castable processing and molten- metal corrosion parameters.