Research in the Field of Preparing Molded and Unmolded Refractories Based on High-Alumina HCBS. Part 11. Composite Composition HCBS (Bauxite Electrocorundum, Quartz Glass) and some Properties of Materials Based Upon Them1

Resumo

Single-stage wet grinding is used to prepare composite composition HCBS based on bauxite, electrocorundum, and very fine fuzed quartz with a moisture content of 11%. Properties are studied for specimens fired in the range 900 – 1640°C. Depending on firing temperature T_fir three typical ranges are separated corresponding to primary sintering and shrinkage (up to 1200°C), mullitization and growth (1200 – 1400°C), and sintering of mullitized material (above 1400°C). The maximum value of ultimate strength in bending of 140 – 150 MPa corresponds to T_fir = 1250 – 1400°C and in compression 750 MPa at 1640°C.