Analysis of Porous Structure and Permeability Samples of Graphite-Containing Refractory Masses

摘要

Laboratory samples of graphite-containing refractories (crucible and muffle masses) were fabricated and the effects of their starting composition and heat-treatment conditions on apparent (p_a) and pycnometric (real, p_r) densities, open porosity (P_o). gas permeability (K_g), specific surface area (S_w), and pore specific volume (V)-radius size distribution were investigated. It has been found that the optimal pore structure (minimum values of P_o, V, K_g, S_w) for the crucible masses is formed at the heat-treatment temperatures (HTT) of 1350-1400 ℃, and for the muffle masses at 1100 ℃. The increase in HTT up to 1600 ℃ in all cases results in the increase of P_o, V, and K_g, and the decrease of the material strength.