A kind of calcium hexaaluminate foam ceramics and preparation method thereof

Abstract

The invention relates to a calcium hexaaluminate foam ceramic and a preparation method thereof. The technical proposal is: use 75-95wt% alumina fine powder and 5-25wt% calcium carbonate as raw materials, add 30-200wt% sugar of the raw materials, and mix uniformly to obtain a mixture. Then, the mixture is heated to 200-280° C. and stirred to obtain a dispersion system in which the raw materials are uniformly dispersed in the sugar melt. Then the dispersion system is foamed and solidified at a constant temperature of 120-180°C for 18-50 hours, and finally the solidified body is fired at 1330-1680°C and kept for 1-9 hours to obtain calcium hexaaluminate foam ceramics . The invention has the characteristics of energy saving, environmental protection and simple process, and the prepared calcium hexaaluminate foam ceramic has stable performance, very low impurity content, low bulk density and high strength.

Description

technical field [0001] The invention belongs to the technical field of foam ceramics. Specifically relates to a calcium hexaaluminate foam ceramic and a preparation method thereof. Background technique [0002] Foam ceramics is a kind of foam-like porous ceramics in shape. It is the third generation of porous ceramic products developed after ordinary porous ceramics and honeycomb porous ceramics. This kind of ceramic product has three-dimensional interconnected pores, and its shape, pore size, permeability, surface area and chemical properties can be adjusted appropriately. The product is like "tempered foam plastic" or "ceramized foam". Sponge". As a new type of inorganic non-metallic filter material, ceramic foam has the advantages of light weight, high strength, high temperature resistance, corrosion resistance, simple regeneration, long service life and good filter adsorption. Moreover, due to the existence of closed pores in the foamed ceramics, the heat release effi...

AI Technical Summary

Problems solved by technology

The machine pressing method generally uses a burn-out pore-forming agent to create pores. This method has the following disadvantages: (1) The burn-out pore-forming agent is used, and the product is easy to crack due to its elastic aftereffect in the process of product preparation; (2) The burn-out pore-forming agent is used Pore-forming agent, during the firing process of the product, some inorganic substances are likely to remain, which will affect the high-temperature performance of the product; (3) The burning of the pore-forming agent will pollute the environment

Although the preparation of lightweight insulation materials by foam method does not have the disadvantages of the above-mentioned machine pressing method, there are still some shortcomings in the preparation of lightweight insulation materials by foam method: (1) Chromatography is easy to occur during the product preparation process, resulting in uneven material distribution. Uniform; (2) The preparation of lightweight insulation materials by the foam method requires the addition of water reducers or dispersants, and inorganic substances such as K and Na will remain after firing; (3) The production cycle of the foam method is long