Research in the Field of Preparing Molded and Unmolded Refractories Based on High-Alumina HCBS. Part 5. Effect of Firing Temperature on Properties of Materials Prepared From Composite HCBS With Addition of Refractory Clay1

Resumo

The effect of firing temperature in the range 800 – 1600°C and heat treatment duration (60 h at 1350 – 1400°C) on shrinkage and growth indices, porosity, and strength for specimens based on HCBS of composite composition (bauxite and VFQG), and also with added clay, is studied. Depending on specimen composition there is low shrinkage within the limits of 0.4 – 1.15% in the range 1100 – 1200°C and significant growth (2.0-.27%) as a result of secondary mullite formation occurring at 1300 – 1500°C.