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Corrosion-resistant ceramic roller and preparation method thereof

A ceramic roller, corrosion-resistant technology, applied in the direction of lighting and heating equipment, furnace type, furnace, etc., can solve the problems that glaze drops easily enter the interior of the roller, the internal structure is easy to change, and affect the service life of the roller, etc., to achieve Effects of reducing total porosity, low crystal activity, and enhancing mechanical properties

Active Publication Date: 2019-07-12
JIN GANG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Corrosion-resistant ceramic roller and preparation method thereof

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preparation example Construction

[0060] Correspondingly, the present invention also discloses a method for preparing the above-mentioned corrosion-resistant ceramic roller, which includes:

[0061] (1) carrying out batching, ball milling, inkjet drying and homogenization of each raw material according to the formula to obtain the mixture;

[0062] Wherein, the formula includes in parts by weight: 20-30 parts of kaolin, 5-10 parts of refractory clay, 60-70 parts of alumina, and 1-5 parts of sintering aid.

[0063] (2) adding water to the mixture, wet mixing and granulating to obtain a blank;

[0064] Preferably, step (2) includes: adding 2.4-2.8 cellulose ethers to the mixture, dry mixing for 4-6 minutes; adding 12-15 parts of water, wet mixing for 10-15 minutes, and then granulating to obtain Blank;

[0065] (3) extruding the blank into a hydraulic press to obtain a blank tube;

[0066] (4) drying the billet tube, and controlling the water content to 1.2%-2.5% after drying;

[0067] Preferably, the drying...

Embodiment 1

[0088] formula:

[0089] 20 parts of kaolin, 5 parts of refractory clay, 70 parts of alumina, 2 parts of sintering aid, 3 parts of mineralizer;

[0090] Among them, alumina fine powder is selected as alumina, and its particle size is D50=5μm; talc is selected as sintering aid, and glass frit is selected as mineralizer;

[0091] Preparation:

[0092] (1) each raw material is carried out batching, ball milling, ink jet drying, homogenization according to the formula to obtain the mixture;

[0093] (2) adding water in the described mixture, carrying out wet mixing and granulation to obtain blank;

[0094] (3) extruding the blank in a hydraulic press to obtain a blank tube;

[0095] (4) drying the blank tube, and the moisture content after drying is 1.2%;

[0096] (5) cold isostatic pressing is carried out on the dried blank tube under 150MPa pressure;

[0097] (6) sintering the cold isostatic pressing blank tube to obtain a finished product of a corrosion-resistant ceramic rol...

Embodiment 2

[0100] formula:

[0101] 30 parts of kaolin, 8 parts of refractory clay, 60 parts of alumina, 1 part of sintering aid, and 1 part of mineralizer.

[0102] Wherein, the refractory clay composition is: SiO 2 54.85%, Al 2 O 3 28.75%, Fe 2 O 3 0.8%, TiO 2 2.0%, CaO 0.05%, MgO 0.14%, K 2 O 6.5%, Na 2 The balance of O 0.03% is impurities; alumina is alumina fine powder, and its particle size is D50=1 μm; calcium carbonate is selected as sintering aid; glass frit is selected as mineralizer.

[0103] Preparation:

[0104] (1) batching various raw materials according to the formula and ball-milling to obtain slurry;

[0105] (2) after the slurry pressure filtration, a mud cake is obtained;

[0106] (3) described mud cake is carried out vacuum refining mud, obtain mud material;

[0107] (4) extruding the mud through a vacuum extruder to obtain a billet tube;

[0108] (5) drying the blank tube, and controlling the moisture content of the blank tube to be less than or equal...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/117C04B35/622C04B35/66F27B9/24
CPCC04B35/117C04B35/622C04B35/66C04B2235/3208C04B2235/3463C04B2235/349C04B2235/36C04B2235/5436C04B2235/656C04B2235/6567C04B2235/9692F27B9/2407
Inventor 方仁德王玉梅林珊梁章发
Owner JIN GANG NEW MATERIALS
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