Alumina tubes are widely used in high-temperature applications due to their exceptional thermal properties, including a coefficient of linear thermal expansion of 7.3-7.2 x10^-6 mm/°C (25-500°C), thermal conductivity of 16-23 W/(m·K), and specific heat of 0.78 x10^3 J/(Kg·K). These properties, combined with their high-temperature resistance (up to 1800°C), make them ideal for industries such as float glass, aluminum trichloride, bioceramics, and laboratory analysis. Their durability, corrosion resistance, and dielectric properties further enhance their suitability for harsh environments, including atmosphere retort furnaces, roller kilns, and tube furnaces.
Key Points Explained:
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Thermal Expansion and Stability
- Coefficient of Linear Thermal Expansion: 7.3-7.2 x10^-6 mm/°C (25-500°C). This low expansion rate ensures dimensional stability under rapid temperature changes, critical for applications like roller kilns and atmosphere retort furnaces.
- High-Temperature Resistance: Withstands up to 1800°C, making it suitable for sintering bioceramics, CIM components, and industrial furnaces.
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Thermal Conductivity and Heat Management
- Thermal Conductivity: 16-23 W/(m·K). This range allows efficient heat transfer while minimizing thermal stress, ideal for dielectric heating in tube furnaces and burner holes in gas/oil-fired kilns.
- Specific Heat Capacity: 0.78 x10^3 J/(Kg·K). Moderates energy absorption, ensuring consistent performance in cyclic heating environments like vacuum tube electric furnaces.
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Mechanical and Chemical Durability
- Compression/Wear Resistance: Essential for transporting materials in roller kilns and withstanding abrasive industrial processes.
- Corrosion Resistance: Resists chemical degradation in harsh environments (e.g., aluminum trichloride industry).
- Dielectric Properties: Ensures safe electrical insulation in temperature measurement components and cable lead-outs.
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Composition and Performance
- Primary Composition: AL2O3 (93-97%), with SiO2 (1.5-3.5%), CaO (1.2-2.8%), and MgO (0-3.5%). This blend optimizes thermal and mechanical performance.
- Gas Tightness: Prevents leakage in vacuum atmosphere furnaces and muffle furnace tubes.
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Industry Applications
- Laboratory Analysis: Used in high-precision furnaces due to thermal stability.
- Float Glass/Aluminum Trichloride: Leverages high-temperature resistance and corrosion immunity.
- Bioceramics/CIM: Benefits from wear resistance and biocompatibility.
Alumina tubes exemplify how advanced materials enable technologies that quietly shape modern healthcare, manufacturing, and research. Have you considered how their properties might optimize your specific high-temperature processes?
Summary Table:
| Property | Value | Importance |
|---|---|---|
| Coefficient of Linear Thermal Expansion | 7.3-7.2 x10^-6 mm/°C (25-500°C) | Ensures dimensional stability in rapid temperature changes |
| Thermal Conductivity | 16-23 W/(m·K) | Efficient heat transfer with minimal stress |
| Specific Heat Capacity | 0.78 x10^3 J/(Kg·K) | Consistent performance in cyclic heating |
| Max Temperature Resistance | Up to 1800°C | Suitable for extreme industrial processes |
| Composition | AL2O3 (93-97%) + SiO2, CaO, MgO | Optimizes thermal/mechanical performance |
Optimize your high-temperature processes with precision-engineered alumina tubes!
Leveraging KINTEK’s expertise in advanced furnace solutions, our alumina tubes deliver unmatched thermal stability, corrosion resistance, and durability for industries like float glass, bioceramics, and lab analysis. Whether you need standard or customized solutions, our in-house R&D and manufacturing ensure your unique requirements are met.
Contact us today to discuss how our high-performance alumina tubes can enhance your application!
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