High-strength aluminum oxide light-weight heat insulation brick and preparation method thereof

Abstract

The invention relates to a high-strength aluminum oxide light-weight heat insulation brick and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: premixing 25-40 wt% of alpha-Al2O3 fine powder with the particle size of 0.074-0.147mm, 25-40 wt% of alpha-Al2O3 fine powder with the particle size of 0.043-0.074mm, 10-15 wt% of alpha-Al2O3 fine powder with the particle size of less than 0.043mm, 10-15 wt% of alpha-Al2O3 micropowder, 3-10 wt% of rho-Al2O3 micropowder and 2-10 wt% of three-stone used as raw materials with combustion improver (accounting for 0.1-1 wt% of the raw materials), water (accounting for 20-35wt% of the raw materials) and water reducing agent (accounting for 0.1-0.7 wt% of the raw materials) for 5-10 minutes to obtain a premix; and adding foam into the premix, evenly mixing, carrying out casting molding and microwave drying, and keeping the temperature of 1450-1750 DEG C for 3-6 hours to obtain the high-strength aluminum oxide light-weight heat insulation brick. The invention has the characteristics of simple technique and energy conservation. The product has the characteristics of high strength, small linear variation rate, low volume density, low heat conductivity coefficient and short drying cycle.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials, and in particular relates to a high-strength alumina lightweight heat-insulating brick and a preparation method thereof. Background technique [0002] Energy conservation is one of the important measures to maintain sustainable economic development, and heat preservation is one of the important measures to save energy. Therefore, heat insulation materials with micro-nano pores play an important role in the field of heat insulation. Traditional high-temperature furnaces have disadvantages such as low heating rate, large heat capacity, large energy consumption, and short service life due to the heavy structure. Therefore, the development of high-strength, light-weight, low-thermal conductivity, and high-temperature furnaces can meet the needs of light-weight structure high-temperature furnaces. The required lining material is the main direction of research. [0003] Lightw...

AI Technical Summary

Problems solved by technology

But there are also the following disadvantages: (1) the preparation of alumina hollow spheres consumes a lot of energy; (2) it is difficult to produce alumina hollow spheres with lower bulk density, so their thermal insulation performance is affected

However, the main disadvantages of this method are: (1) Due to the large amount of fine powder in the raw material, the sample has a large linear shrinkage after sintering, and the sample structure is destroyed; (2) Due to the large amount of water in the sample, the sample drying cycle is very long