Alumina ceramic plunger pump is a positive-displacement pump (typically metering, dosing, or injection type) whose reciprocating plunger/piston and often the matching cylinder liner or seal track are made from high-purity alumina (Al₂O₃) ceramic. By replacing coated metals at the wet end with polished alumina parts, the pump maintains a tight, low-leakage seal while handling corrosive, abrasive, or high-pressure media.
Alumina Ceramic Plunger Pump Benefits
- Seal Stability Under Load: polished working zone maintains a consistent seal against liners, reducing slip and micro-leakage.
- Wear & Scratch Resistance: high hardness alumina resists slurry abrasion and cavitation pin-holes at seal line.
- Corrosion Robustness: inert to many acids/alkalis and common solvents versus coated metallic plungers.
- Geometry Repeatability: concentricity and runout control supports predictable volumetric accuracy in dosing.
- Thermal Stability: dimensional stability during temperature swings minimizes seal distortion at startup/shutdown.
Properties of Alumina Ceramic Plunger Pump
| 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 Plunger Pump Specifications
| Machining Accuracy | |
|---|---|
| Dimension | 0.001mm |
| Surface Finish | <Ra0.02 |
| Hardness | Hv1280-1340 |
| Parallelism | 0.01mm |
| Cylindricity | 0.003-0.01mm |
| Single Section Roundness | <0.001 |
| Alumina Ceramic Plunger Tube | |||
| Item No. | Diameter（mm) | Length (mm) | Purity (%) |
| AT-ZS-001 | 3.5 | 100 | 99 |
| AT-ZS-002 | 3.8 | 120 | 99 |
| AT-ZS-003 | 4.5 | 123 | 99 |
| AT-ZS-004 | 5.5 | 130 | 99 |
| AT-ZS-005 | 6.5 | 135 | 99 |
| AT-ZS-006 | 7.5 | 145 | 99 |
| AT-ZS-007 | 9 | 150 | 99 |
| AT-ZS-008 | 15 | 160 | 99 |
| AT-ZS-009 | 18 | 175 | 99 |
| AT-ZS-010 | 20 | 190 | 99 |
| AT-ZS-011 | 20.5 | 200 | 99 |
| AT-ZS-012 | 21 | 260 | 99 |
| AT-ZS-013 | 25 | 300 | 99 |
| AT-ZS-014 | 30 | 320 | 99 |
| AT-ZS-015 | 31 | 350 | 99 |
| Alumina Ceramic Plunger Rod | ||||
| Item No. | Inner Diameter（mm) | Outer Diameter（mm) | Length（mm) | Purity (%) |
| AT-ZS-016 | 2.5 | 6.5 | 80 | 99 |
| AT-ZS-017 | 3.2 | 7.2 | 100 | 99 |
| AT-ZS-018 | 3.5 | 8.5 | 105 | 99 |
| AT-ZS-019 | 3.8 | 7.8 | 120 | 99 |
| AT-ZS-020 | 4.0 | 8 | 125 | 99 |
| AT-ZS-021 | 4.2 | 9.2 | 130 | 99 |
| AT-ZS-022 | 4.8 | 9.8 | 140 | 99 |
| AT-ZS-023 | 5.2 | 11.2 | 180 | 99 |
| AT-ZS-024 | 5.5 | 9.5 | 190 | 99 |
| AT-ZS-025 | 6 | 12 | 245 | 99 |
| AT-ZS-026 | 7 | 15 | 285 | 99 |
Alumina Ceramic Plunger Pump Packaging
- Protective Packaging: each plunger in an EPE sleeve or tray; multi-layer carton with shock isolation;
