Alumina Ceramic Roller
Alumina ceramic rollers are high-performance industrial ceramic products primarily composed of alumina (Al₂O₃), and are key components of modern high-temperature roller kilns. Made of high-purity alumina via isostatic pressing and high-temperature sintering, our roller rod boasts excellent high-temperature resistance, wear resistance and thermal shock stability. We offer comprehensive customization to meet personalized needs of different industries and equipment.
Standard Specifications & Customization:
Standard specs below; full customization available based on your parameters, drawings or kiln/production needs:
1. Alumina Content: 92%/95%/99% (customizable 85%–99.5%)
2. Outer Diameter: 12–100mm (common 12-80mm, customizable 10–150mm, tolerance adjustable)
3. Length: 500–6000mm (common 1200-5300mm, customizable 300–6000mm, extra-long splicing available)
4. Water Absorption: 3–6% (customizable ≤2% or special requirements)
5. Bending Strength: 60–100MPa (customizable up to 150MPa)
6. Type: Solid/Hollow (hollow: wall thickness/inner hole customizable)
7. Other Customizations: Surface treatment, end structure, special material ratio for extreme conditions.
Product Features:
1. Excellent High-Temperature Resistance: Maximum operating temperature up to 1600℃, refractoriness ≥1750℃, stable at high temperature without deformation; extremely reliable thermal stability and excellent thermal shock resistance for products fired up to 1400℃.
2. High Hardness & Wear Resistance: Rockwell hardness HRA80-90 (second only to diamond), Mohs hardness ≥9; wear resistance is 266 times that of manganese steel and 171.5 times that of high-chromium cast iron, extending equipment life by at least ten times and reducing downtime and costs.
3. Superior Thermal Shock Stability: Low thermal expansion, resistant to rapid heating/cooling, not easy to crack.
4. Good Chemical Stability: Acid/alkali/glaze corrosion-resistant, no pollution to processed products.
5. Smooth Surface & High Accuracy: Precision-ground (Ra ≤1.6μm), stable operation, no scratches (accuracy customizable).
6. Light & Energy-Saving: Density 3.5–3.8 g/cm³ (3.6 g/cm³ as standard, only half that of steel), significantly reducing equipment load and extending equipment life.
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Techinical Index
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G98
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G96
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A95
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A93
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V93
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V90
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H95
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Water Absorption
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3-5
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4-6
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4.5-7.5
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5-8
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6-8
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6.5-8.5
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5.5-7.5
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Bending Strength (Room Temperature)
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65-78
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60-75
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60-70
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55-65
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50-65
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50-65
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60-70
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Bending Strength (Temperature 1350)
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55-70
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50-65
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48-60
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45-55
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40-55
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40-55
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50-65
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Bulk Density
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2.9-3.1
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2.7-2.9
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2.6-2.8
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2.5-2.7
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2.45-2.65
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2.4-2.6
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2.65-2.85
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Coefficient of Thermal Expansion
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6.0-6.4
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6.0-6.4
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6.0-6.5
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6.0-6.5
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6.0-6.5
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6.0-6.5
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6.0-6.5
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Thermal Shock Resistance
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Very Good
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Very Good
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Very Good
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Very Good
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Very Good
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Very Good
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Very Good
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Maximum Operating Temperafure
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1400
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1350
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1300
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1300
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1250
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1250
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1300
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Alumina Content (%)
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79
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78
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77
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76
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75
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75
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77
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Main Applications:
1. Ceramic Industry: Wall/floor tiles, sanitary/daily-use ceramics, polished tiles, large slabs
2. Glass Industry: Glass annealing, tempering furnaces
3. Metallurgy & Heat Treatment: High-temperature conveyor lines
4. New Energy: Positive/negative electrode sintering kilns
5. Others: High-temperature chemical equipment, electronic component kilns (customizable for more fields)
Usage Precautions:
1. The inner cavities at both ends of the roller must be filled with refractory fiber cotton.
2. A protective coating must be applied before entering the kiln and allowed to dry completely.
3. During use, surface residue should be cleaned regularly.
4. When replacing rollers, pay attention to the cooling rate and method to avoid damage caused by rapid heating or cooling.
Frequently Asked Questions
Need help? Be sure to visit our support forums for answers to your questions!
We are a real manufacturer, our factory is specialized in producing refractory materials for more than 30 years. We promise to provide the best price, the best pre-sale and after-sale service.
For each production process, RBT has a complete QC system for chemical composition and physical properties. And we will test the goods, and the quality certificate will be shipped with the goods. If you have special requirements, we will try our best to accommodate them.
Depending on the quantity, our delivery time is different. But we promise to ship as soon as possible with guaranteed quality.
Of course, we provide free samples.
Yes, of course, you are welcome to visit RBT company and our products.
There is no limit, we can provide the best suggestion and solution according to your situation.
We have been making refractory materials for more than 30 years, we have strong technical support and rich experience, we can help customers design different kilns and provide one-stop service.
