Corrosion-resistant ceramic roller and preparation method thereof

Abstract

The invention discloses a corrosion-resistant ceramic roller. The ceramic roller is mainly prepared from kaolin, refractory clay, alumina, a sintering aid and other raw materials. The invention also discloses a preparation method of the corrosion-resistant ceramic roller. The prepared corrosion-resistant ceramic roller is resistant to rapid cooling and rapid heating and does not crack after beingcycled at 1350 DEG C-room temperature 2 times or more, has normal temperature bending strength being higher than or equal to 80 MPa, high temperature bending strength being higher than or equal to 80MPa at 1350 DEG C, water absorption being lower than or equal to 0.5% and roller mass erosion rate being lower than or equal to 1% , has significant corrosion resistance, and can be widely used in production of ceramic products and magnetic materials.

Description

technical field [0001] The invention belongs to the field of preparation of kiln furniture materials, in particular to a corrosion-resistant ceramic roller bar and a preparation method thereof. Background technique [0002] Ceramic roller is a kind of special refractory kiln furniture, which plays the role of supporting and conveying ceramic bricks and other products in the roller kiln and drying kiln. It is the core component of the roller kiln. It is widely used in architectural ceramics, household ceramics, electronic ceramics, magnetic materials, glass heat treatment and other fields. [0003] During the firing process of ceramic wall and floor tiles, the high-temperature exhaust gas contains a large amount of corrosive gases generated by combustion, such as sulfur dioxide, etc., and also contains polluting components such as chloride ions, nitrogen oxides, etc. generated during the firing process of ceramic green bodies. These gaseous pollutants are very corrosive, and...

AI Technical Summary

Problems solved by technology

These gaseous pollutants are very corrosive, and because the porosity of the currently used ceramic rollers is generally high, above 8%, these gases can easily penetrate into the interior of the ceramic rollers; The composition is easy to react with pollutants, and the internal structure is easy to change, resulting in the deterioration of the performance of the roller bar, the reduction of strength, the increase of brittleness, and eventually fracture damage

There are also some special products, such as magnetic materials, which will also produce more corrosive gases during the firing process. During the firing stage, the rollers will be severely corroded and the service life of the rollers will be affected.

[0004] In addition, during the firing process of some special ceramic wall and floor tile materials (such as tiles, glazed tiles, etc.), the glaze on the product surface softens and easily adheres to the surface of the roller, causing corrosion to the roller.

At present, the roller kilns used in construction production enterprises are all corundum-mullite ceramic rollers. The existing corundum-mullite ceramic rollers all have an open porosity of more than 8%, which makes the glaze drop very easy. It is easy to enter the inside of the roller and form corrosion; at the same time, after the glaze droplets entering the interior are corroded, some closed pores are also opened; resulting in a significant increase in the number of open pores on the surface of the ceramic roller, which further increases the corrosion rate; the glaze droplets entering the interior of the roller It will react with the acicular mullite crystals in the roller at high temperature, reducing its strength and making it easy to break, greatly reducing the service life of the roller and affecting normal production

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