A kind of corundum refractory castable

Abstract

The invention discloses a corundum refractory castable. The raw materials used include a main material and an added organic dispersant. The main material is composed of corundum particles and fine powder, nano zinc oxide, aluminum oxide powder, and a binder. The weight percent of the raw materials is: 80-95wt% of corundum particles and fine powder, 3-15wt% of alumina micropowder, 1-5wt% of binder, 0.2-5wt% of nano-zinc oxide, and the added organic dispersant is the weight of the main material. 0.05-0.3 wt%. The present invention utilizes the characteristics of fine particle size of nano-zinc oxide powder, high activity at high temperature, moderate price and the like to improve the structure of the corundum castable, increase the medium-temperature strength, and prepare a corundum castable with excellent comprehensive performance and moderate price.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to corundum refractory castables. Background technique [0002] Corundum refractory castables are widely used in metallurgy, petrochemical, building materials and other industries due to their excellent high temperature performance. However, due to the use of calcium aluminate cement and SiO2 micropowder in traditional low-cement or ultra-low-cement bonded corundum castables, the temperature at which the liquid phase appears in the material decreases, which seriously affects the high-temperature performance of the material. The cement-free corundum castables have low medium-temperature strength due to the decomposition of hydrates in the binder during the medium-temperature stage (800-1100°C), and no new binding phases, which cannot meet the requirements of on-site use. Therefore, people introduce nano-materials into corundum castables to improve the medium temperature performan...

AI Technical Summary

Problems solved by technology

Although these two methods can achieve relatively obvious effects, the added nano-calcium carbonate or magnesium carbonate will decompose at a certain temperature to produce CO2 gas, and the gas may have some impact on the internal structure of the material when the gas is discharged from the inside of the material. Negative effects, such as causing cracks, increasing the porosity of the material, etc.

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