Heavy-Duty Protection for Heating Elements and High-Efficiency Radiant Heat Transfer
Silicon Carbide (SiC / RBSiC / SSiC) heater protection tubes and radiant sheaths are high-performance refractory ceramic pipes designed to protect electric heating elements (such as SiC rods or coiled wire elements) from hostile furnace environments and molten metal attack[cite: 18, 20, 23]. Widely used in aluminum holding furnaces, immersion heaters, and atmosphere-controlled heat treatment kilns, they isolate the heater from corrosive gases, liquid metal splashes, and mechanical erosion, significantly prolonging heating element lifespan[cite: 18, 20].
Key Advantages
- Exceptional Thermal Conductivity & Radiant Efficiency: Quickly conducts and radiates thermal energy generated by the internal heater into the furnace chamber or molten bath without thermal lagging[cite: 18, 20].
- Non-Wetting to Molten Aluminum: Highly inert against molten aluminum, zinc, and aggressive fluxes; prevents dross buildup, sticking, and metallic contamination.
- Extreme Thermal Shock & High Temperature Resistance: Retains high structural stability up to 1380°C (RBSiC) – 1650°C (SSiC) without sagging, bending, or cracking under rapid thermal cycles[cite: 18, 21].
- Extended Heater Life: Protects heating elements from oxidation and carburizing or corrosive gas atmospheres, preventing premature element failure.
- Versatile Profiles & Custom Designs: Available in cylindrical round tubes, rectangular/square beam profiles, open-ended pipes, or single-end closed immersion sheaths[cite: 18, 20, 21, 23].
Technical Specifications
| Specification | Value |
|---|---|
| Material | Reaction Bonded Silicon Carbide (SiSiC / RBSiC) or Sintered SiC (SSiC) |
| Max Operating Temperature | 1380°C (RBSiC) / 1650°C (SSiC) |
| Bulk Density | ≥ 3.02 – 3.15 g/cm³ |
| Thermal Conductivity (1200°C) | > 45 W/m·K |
| Bending Strength (20°C) | ≥ 250 – 400 MPa |
| Profiles Available | Round cylindrical tube, square profile, open-end or one-end closed[cite: 18, 20, 21, 23] |
| Standard Diameters (OD) | Ø 40 mm – Ø 250 mm+[cite: 18, 23] |
| Standard Lengths | 500 mm – 3000 mm (Custom dimensions available) |
Applications
Immersion heater protection in molten aluminum melting and holding furnaces, gas/electric radiant tube heating systems, controlled atmosphere heat treatment furnaces (carburizing, annealing), and industrial tunnel kilns[cite: 18, 20].
Tags: heater protection tube, sic radiant tube, silicon carbide sheath, immersion heater tube, radiant sheath, rbsic tube
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