关键词: Al₂O₃-SiC-C质浇注料, 抗渣性, 沥青, 鳞片石墨, 炭黑

Abstract:

Al₂O₃-SiC-C based castables were prepared with brown corundum,SiC,aluminate cement,α-Al₂O₃ micropowder,and SiO₂ fume as starting materials.Effects of pitch types (spherical pitch,high temperature modified pitch,spherical+high temperature modified pitch),compounds of pitch and graphite (or carbon black) on the flowability of the castables and the properties of the specimens hot treated at 110,1 100,and 1 450 ℃ were researched.The results show that the flowability and the oxidation resistance of the castables can be improved by introducing the spherical+high temperature modified pitch.With temperature rising,the bulk density,the modulus of rupture and the crushing strength of the castables firstly decrease and then increase,the change of the apparent porosity is inversely correlated.Addition of composite carbon source results in the increase of water demand of the castables and obvious improvement of oxidation and slag corrosion resistance.The castables with the addition of pitch+carbon black perform the best oxidation resistance and slag resistance.

Key words: alumina-silicon carbide-carbon iron trough castables, slag resistance, pitch, flake graphite, carbon black