Fabrication of aluminium titanate castable

Abstract

AbstractA castable was made using an aggregate of aluminium titanate (AT) of composition 95%Al1·57 Fe0·43 TiO5 , 2% corundum, and 3% aluminosilicate glass with 10% high alumina cement, deflocculant, and water. Cast blocks after firing at 1400°C for 6 h were used to determine physical and mechanical properties at ambient temperature. The castables had a crushing strength of 125 MPa, a bend strength of 14 MPa, and a Young's modulus of 9·6 GPa. They had a coefficient of thermal expansion (CTE) of 1·3 × 10-6 K-1 from ambient temperature to 1200°C. The low Young's modulus and CTE indicate that the castable should have excellent thermal shock resistance. The properties of the AT castable when compared with those of commercial high alumina castables showed it to have a similar strength, but much lower porosity (10%), Young—s modulus, and CTE. Phase analysis of the cast blocks showed that the major phase was iron aluminium titanate with minor phases (<10%) of corundum and a calcium aluminosilicate, which is proba...