Light Al2O3-SiC-C refractory brick and preparation method thereof

Abstract

The invention relates to a light Al2O3-SiC-C refractory brick and a preparation method thereof. The preparation method comprises the steps of: taking 45-65wt% of porous corundum particles, 18-25% of fine corundum powder, 4-8wt% of SiC particles, 4-8wt% of fine SiC powder, 6-12wt% of crystalline flake graphite, 1.5-2.5wt% of ganister sand and 0.2-0.6wt% of aluminite powder as materials; adding 3.5-5wt% of phenolic resin to evenly stir; and mechanically pressing and molding, carrying out heat preservation on the molded billet for 12-36 hours at 200-240 DEG C, and then carrying out heat preservation for 2-6 hours at 1400-1500 DEG C under the condition of reducing atmosphere, so as to obtain the light Al2O3-SiC-C refractory brick. The light Al2O3-SiC-C refractory brick is simple in preparation process; the prepared light Al2O3-SiC-C refractory brick not only has the characteristics of high strength, excellent thermal shock resistance, strong medium erosion resistance and low thermal conductivity, but also has the characteristics of apparent porosity and pore size controllability, and is suitable for the devices such as torpedo hot metal mixer cars, metal mixers, and ladles (tanks).

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory bricks. Specifically related to a light Al 2 o 3 -SiC-C refractory brick and its preparation method. Background technique [0002] Refractory materials are composed of aggregate and matrix, and the matrix is ​​relatively loose. During the use of refractory materials, solvents such as slag first corrode the matrix. The matrix surrounds the aggregate, and when the matrix is ​​eroded into a metamorphic layer, the aggregate is spalled with the matrix from the refractory into the slag. Therefore, in terms of corrosion resistance, the effect of dense aggregate is not obvious. Al is used in the preparation of traditional torpedo-type mixed iron cars, mixed iron furnaces and ladles (cans) 2 o 3 -SiC-C and Al 2 o 3 -SiC refractories, people often use dense materials as aggregates, such as white corundum, brown corundum or alumina. In order to prepare dense aggregate, raw materials ...

AI Technical Summary

Problems solved by technology

At present, the research on lightweight refractory materials mainly focuses on the heat insulation refractory materials used in the insulation layer of high-temperature kilns, while there are few studies on lightweight refractory materials used in the working layer, especially the torpedo-type mixed iron car, mixed iron furnace and The working layer of the ladle (tank) does not use light refractory materials, especially light Al 2 o 3 -SiC-C or Al 2 o 3 -SiC refractories