Corundum-mullite thermal insulation material and preparation method thereof

Abstract

The invention relates to a corundum-mullite thermal insulation material and a preparation method thereof. The invention adopts the technical scheme comprising the following steps: uniformly mixing a corundum fine powder, a bauxite fine powder, aluminum hydroxide, a quartz sand fine powder, ammonium metavanadate and thermosetting phenolic resin, performing compression molding, performing thermal treatment for 3 to 5 hours in neutral atmosphere at 900 to 1200 DEG C, and performing breaking, ball milling and screening, so as to obtain ball milled materials and granules; mixing the ball milled materials, the corundum fine powder, the bauxite fine powder, ferrosilicon nitride, hydroxyethyl cellulose and water, and performing ball milling, so as to obtain slurry; then uniformly mixing the granules, the corundum fine powder, the ball milled materials and the slurry, performing compression molding, drying, and performing thermal insulation for 3 to 5 hours at 1400 to 1600 DEG C, so as to obtain the corundum-mullite thermal insulation material. The method is wide in material source and low in production cost, and the formed corundum-mullite thermal insulation material has the characteristics of low volume density, high strength and excellent thermal insulation performance.

Description

Technical field [0001] The invention belongs to the technical field of thermal insulation materials. Specifically, it relates to a corundum-mullite heat insulation material and a preparation method thereof. Background technique [0002] The service performance of thermal insulation materials is crucial to the energy saving and consumption reduction of high-temperature industries and safe production. With the development of high-temperature industries, high-strength, microporous and low thermal conductivity properties have become important directions for the research and development of thermal insulation materials. The corundum-mullite thermal insulation material with corundum and mullite as the main crystal phase has the advantages of good high temperature resistance, low thermal conductivity, excellent thermal shock resistance and low thermal expansion coefficient. It is used in industrial furnaces and high temperature It is widely used in thermal equipment such as electric fur...

AI Technical Summary

Problems solved by technology

[0003] In the existing preparation technology of corundum-mullite thermal insulation materials, organic / inorganic foaming agents, loss of ignition agents are usually introduced, or the characteristics of salt decomposition are used. Although the development and production of thermal insulation materials are realized, there are The following disadvantages: (1) The introduced organic additives, binders or binders are carbonized and decomposed at high temperatures, producing thick smoke and irritating gases, polluting the environment; (2) Some raw materials or additives introduced have low melting points, and the resulting low melting point liquid phase is intensified Reduce the shrinkage of the material and reduce the service life of the product; (3) The strength is small, and it is prone to deformation and cracks after being subjected to external stress, mechanical vibration, etc., which affects the structural stability of the thermal insulation lining and weakens the thermal insulation effect