High-Temperature Resistant Alumina Ceramic Insulation Tubes For High-Speed Rail Power Systems
Product Introduction
Our alumina ceramic insulation sleeves are manufactured from 99.5% high-purity alumina material, specifically designed for insulation protection in high-voltage electrical equipment and high-temperature environments. Featuring exceptional insulation strength (>20kV/mm) and hardness (above 1600HV), with special glazed surface treatment achieving arc resistance over 300 seconds, these sleeves represent the ideal replacement for traditional organic insulation tubes.
Key Applications
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Power Systems: High-voltage cable termination protection, substation insulation sleeves
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New Energy: PV inverter insulation covers, wind power converter protection tubes
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Industrial Equipment: Electric furnace heating element protection tubes, high-voltage test equipment insulation covers
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Rail Transit: High-speed rail power system insulation, metro third rail protection
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Laboratories: High-voltage experimental equipment insulation barriers, plasma equipment protection sleeves
Core Advantages
⚡ Superior Insulation: Volume resistivity >10¹⁶Ω·cm, withstand voltage >20kV/mm
⚡ High-Temperature Resistance: Continuous operation up to 1200℃, short-term withstand 1500℃
⚡ Arc Resistance: Meets highest grade of IEC 60672-1 standard
⚡ Mechanical Strength: Flexural strength >400MPa, compressive strength >3000MPa
⚡ Weather Resistance: No cracking in -60℃~1200℃ thermal cycling
Technical Specifications
| Parameter | Standard Grade | Enhanced Grade |
| Al₂O₃ Content | 99.5% | 99.8% |
| Insulation Strength (kV/mm) | 20 | 25 |
| CTE (×10⁻⁶/℃) | 7.5 | 7.0 |
| Flexural Strength (MPa) | 400 | 500 |
| Standard Sizes (mm) | Φ10-200 | Φ10-200 |
| Custom Length (mm) | ≤2000 | ≤2000 |
Manufacturing Process
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Powder Preparation: High-purity alumina powder (D50=0.6μm)
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Isostatic Pressing: 250MPa high-pressure forming for uniform density
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Atmosphere Sintering: 1650℃ nitrogen-protected sintering
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Precision Machining: Simultaneous OD/ID grinding (concentricity ≤0.01mm)
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Surface Treatment: High-temperature glazing (surface resistance >10¹⁴Ω)
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Full Inspection: 100% withstand voltage test + ultrasonic testing
Installation Guidelines
⚠ Professional Recommendations:
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Clean inner/outer surfaces with isopropyl alcohol before installation
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Recommend using ceramic-specific sealant for fixation
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Avoid mechanical impact and localized stress concentration
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Regular inspection of glaze layer integrity (recommended annually)
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Not suitable for strong fluoride environments
Service Commitment
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Quality Warranty: 60-month extended warranty
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Technical Support: Free insulation system design consultation
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Rapid Response: Regional emergency spare parts inventory
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Product Traceability: Laser-marked identification with 10-year quality records
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Customization: Special sizes and structural designs available
Technical FAQ
Q: How to determine when replacement is needed?
A: Replace when surface cracks exceed 10mm length or glaze layer loss >5% area
Q: Selection for humid environments?
A: Recommend moisture-proof models with special hydrophobic treatment
Q: Compatibility with other insulation materials?
A: Can be used with silicone rubber/epoxy resin when using special interface agents
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High-Temperature Resistant Alumina Ceramic Insulation Tubes For High-Speed Rail Power Systems Images
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