Alumina light-weight brick and preparation method thereof

Abstract

The invention relates to an alumina light-weight brick and a preparation method thereof. The method adopts the technical scheme that: 50 to 80 weight percent of Al2O3 fine powder, 15 to 30 weight percent of alpha-Al2O3 micro-powder and 5 to 20 weight percent of rho-Al2O3 micro-powder serving as raw materials are mixed with 0.1 to 1 weight percent of sintering aid, 30 to 50 weight percent of water, 0.1 to 1 weight percent of water reducer and 0.1 to 2 weight percent of SiO2 for 3 to 5 minutes; furthermore, the mixture and 0.2 to 0.4 weight percent of foaming agent are mixed uniformly, and are cast and molded; and the mold is sintered at the temperature of between 1,450 and 1,700 DEG C after being dried, and is insulated for 3 to 5 hours. The method has the characteristics of simple process and energy conservation; and the prepared alumina light-weight brick has the volume density of between 0.6 and 1.1g / cm3, the heat conductivity of between 0.2 and 0.6w / (m.k) and the compression strength of 5 to 15Mpa, and has the advantages of higher strength, small volume density and low heat conductivity compared with hollow ball products.

Description

technical field

[0001] The invention belongs to the technical field of lightweight refractory materials, and in particular relates to an alumina lightweight brick and a preparation method thereof. Background technique

[0002] Energy conservation is one of the important measures to maintain sustainable economic development. Thermal insulation is one of the important measures for energy saving. Therefore, thermal insulation materials with micro-nano pores play an important role in the field of thermal insulation. Thermal insulation materials refer to materials with high porosity, low bulk density and low thermal conductivity. In order to operate in various atmospheres (air, H 2 , N 2 and CO, etc.), to meet the high-temperature heat treatment process requirements of metals, non-metals and their products, and to reduce energy consumption, many scientific and technological personnel are committed to researching lightweight insulation materials used at high temperatures (1750-...