Corundum micro-pore heat-insulating and fireproof material and preparation method thereof

Abstract

The invention relates to a corundum micro-pore heat-insulating and fireproof material and a preparation method thereof. The contents of raw materials of the corundum micro-pore heat-insulating and fireproof material are as follows: 40-50 wt% of corundum grain, 40-45 wt% of corundum fine powder, 5-10 wt% of active a-aluminum oxide micro-powder and 5-10 wt% r-aluminum oxide micro-powder, an additive, a dispersant account for 0.1-0.5 wt% of the above raw materials, nano aluminum oxide powder accounting for 0.1-1.5 wt% of the above materials and water accounting for 5-10 wt% of the above materials. The preparation method comprises the following steps of: dispersing the nano aluminum oxide powder into the water and dispersing under an ultrasonic vibration condition for 1-5 minutes to prepare a uniform suspension solution; then, gradually dropwise adding the suspension solution into a mixed material, and vibrating and molding; maintaining at a room temperature for 24-48 hours; de-molding and carrying out heat treatment at 1400-1600 DEG C; and keeping the heat for 1-5 hours. The corundum micro-pore heat-insulating and fireproof material and the preparation method thereof have the advantages of simple preparation process and lower energy consumption; a product has the advantages of small average hole diameter, high fireproof degree, great high-temperature resistance, low thermal conductivity and strong anti-corrosion resistance; and the product can be directly applied to a working layer of thermal equipment.

Description

technical field

[0001] The invention belongs to the technical field of thermal insulation refractory materials. In particular, it relates to a corundum microporous heat-insulating refractory material and a preparation method thereof. Background technique

[0002] With the country's increasing requirements for energy saving and consumption reduction, the research and development of thermal insulation refractory materials has developed rapidly. Traditional thermal insulation refractory materials such as lightweight corundum bricks, diatomite bricks and anorthite lightweight bricks usually reduce the thermal conductivity of the material by increasing the porosity. The higher the porosity of the material, the lower its mechanical strength. In addition, traditional heat-insulating refractory materials are usually shaped products, which require machine press molding, high energy consumption, and manual masonry during use, which is labor-intensive. Or other parts in direct contac...