An alumina lining tube is a cylindrical wear liner made from high-alumina technical ceramic and installed inside a steel pipe or used as a standalone ceramic tube to protect flow passages that handle abrasive or chemically aggressive media. In bulk solids, ash, slurry and powder conveying systems, the alumina lining tube forms the actual flow surface
Alumina Lining Tube Advantages
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Predictable wear interface in straight spools: A stable liner bore keeps erosion concentrated on the ceramic surface instead of thinning the steel wall at random locations, which makes inspection points and maintenance intervals easier to plan. By keeping the internal diameter consistent along the length, the alumina ceramic lining tube also helps to maintain conveying velocity and pressure drop within the design window over a longer period.
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Service-interval leverage in abrasive transport: In many abrasive conveying lines, public supplier application notes report multi-times wear life (often in the 5–10× range) for ceramic-lined sections compared with unlined steel under similar operating conditions. That extended life, even if derated for conservative design, allows maintenance managers to convert unplanned leak repairs into scheduled changeouts and to align liner replacement with existing shutdown windows.
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Bondline-aware designs: For bonded constructions, the lining system can be specified around adhesive data that commonly lists a practical continuous-use window of roughly 100–240°C, depending on formulation and joint design. Above that range, or where temperature cycling and thermal gradients are expected, the alumina ceramic lining tube can be designed as a monolithic or mechanically retained liner so that performance is governed by the ceramic body rather than by the adhesive layer.
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Maintenance-friendly segmentation options: Instead of replacing an entire pipe spool, replaceable liner sections allow maintenance teams to target only the zones that actually reach the wear limit, which reduces material usage and on-site work during a shutdown. Segmentation also makes it easier to keep spare parts on the shelf, since short standardized liner modules can be swapped into several locations without redesigning the whole assembly.
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End-feature control: Chamfers, lead-ins, and carefully specified transition details at each end of the alumina ceramic lining tube reduce internal steps and sharp changes in cross-section that typically trigger localized erosion. By coordinating these features with the mating steel spool and gasket or coupling geometry, the design minimizes turbulence and particle impact at the joints, which are usually the first points to fail in high-velocity powder or slurry service.
Alumina Ceramic Lining Tube Properties
| Property | Unit | 99.5% Al₂O₃ | 99.6% Al₂O₃ | 99.7% Al₂O₃ | 99.8% Al₂O₃ | 99.9% Al₂O₃ | 99.99% Al₂O₃ |
| Alumina content | % | 99.5 | 99.6 | 99.7 | 99.8 | 99.9 | 99.99 |
| Density | g/cm³ | 3.89 | 3.91 | 3.92 | 3.93 | 3.94 | 3.98 |
| Open porosity | % | 0 | – | – | – | – | – |
| Color | – | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory |
| Water absorption | % | – | 0 | 0 | 0 | 0 | 0 |
| Young’s modulus (Elastic modulus) | GPa | 375 | 356 | 357 | 358 | 359 | 362 |
| Shear modulus | GPa | 152 | – | – | – | – | – |
| Bulk modulus | GPa | 228 | – | – | – | – | – |
| Poisson’s ratio | – | 0.22 | – | – | – | – | – |
| Compressive strength | MPa | 2600 | 2552 | 2554 | 2556 | 2558 | 2570 |
| Flexural strength | MPa | 379 | 312 | 313 | 314 | 315 | 320 |
| Fracture toughness | MPa·m¹ᐟ² | 4 | – | – | – | – | – |
| Hardness | GPa | 14.1 (≈1440 kg/mm²) | 23 | 24 | 25 | 26 | 30 |
| Thermal conductivity | W/m·K | 35 | 32–37 | 33–38 | 34–39 | 35–40 | 36–42 |
| Thermal shock resistance ΔT | °C | – | 222 | 223 | 224 | 225 | 228 |
| Maximum use temperature (no load) | °C | ≤1750 | 1755 | 1760 | 1765 | 1770 | 1800 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 8.4 | – | – | – | – | – |
| Specific heat | J/kg·K | 880 | – | – | – | – | – |
| Volume resistivity | Ω·cm | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric constant (relative permittivity) | – | 9.8 | 9.83 | 9.84 | 9.85 | 9.86 | 9.92 |
| Dielectric strength | kV/mm | 16.9 | 23.2 | 23.4 | 23.6 | 23.8 | 24 |
| Dissipation factor (loss factor @ 1 kHz) | – | 0.0002 | – | – | – | – | – |
Alumina Ceramic Lining Tube Specifications
| Alumina Ceramic Lining Tube | ||
| Item No. | Diameter (mm) | Thickness (mm) |
| AT-YHL-NC01 | Customize | |
Alumina Lining Tube Packaging
- Individual part protection: foam supports or molded inserts to prevent point-load cracking during transport.
