Silicon Carbide (SiC) Heating Elements
Operating Temp: Up to 1550°C
Common Range: 1100–1400°C (safe zone)
Types: Rods, U-shaped, dumbbell, spiral, bayonet
Features:
- High watt density
- Excellent thermal shock resistance
- Easy replacement
Applications: Kilns, heat treatment furnaces, glass, ceramic industries
Kanthal APM / Kanthal Super Alloys
Kanthal APM (FeCrAl Alloy):
Max temp: ~1400°C in air
More oxidation resistant than standard FeCrAl
Kanthal Super (MoSi₂-based):
Similar to MoSi₂ elements with even higher performance in oxidizing atmospheres
Selection Guidelines
| Parameter | SiC Elements | MoSi₂ Elements | Kanthal APM |
|---|---|---|---|
| Max Temp (Air) | 1550°C | 1800°C | 1400°C |
| Oxidation Resistance | Good | Excellent | Very Good |
| Mechanical Strength | Moderate | Brittle | High |
| Cost | Medium | Higher | Medium |
| Atmosphere Compatibility | Oxidizing/Neutral | Oxidizing/Neutral | Oxidizing |
Heating Element Specification Sheet
Type: Silicon Carbide (SiC) Heating Element
Application: Industrial Furnace / Kiln Heating
Temperature Range: 1250°C – 1400°C (Continuous Operation)
General Specifications
| Parameter | Description |
|---|---|
| Element Type | Dumbbell / U-shape / Straight rod (as needed) |
| Material | Recrystallized Silicon Carbide (SiC) |
| Max Operating Temp | 1550°C |
| Recommended Working Temp | 1250°C to 1400°C |
| Diameter Options | 10mm, 12mm, 14mm, 16mm, 25mm, 30mm |
| Length Range | 300 mm to 2000 mm |
| Cold End Length (S) | As per design – usually 150–300 mm |
| Hot Zone Length (H) | Customizable based on furnace design |
Electrical Specifications
| Parameter | Value (Typical) |
|---|---|
| Resistance | 0.1 – 2.0 Ω (as per length & size) |
| Watt Density | 5–20 W/cm² |
| Voltage Range | 50–400 V |
| Current Range | 10–100 A |
| Power Rating | 1–20 kW per element (typical) |
🌡️ Thermal & Mechanical Properties
| Property | Value |
|---|---|
| Thermal Conductivity | 15–30 W/m·K |
| Specific Heat Capacity | ~1.0 J/g·K |
| Maximum Surface Temp | 1600°C |
| Thermal Expansion | 4.6 × 10⁻⁶ /°C |
| Density | 2.5 – 2.8 g/cm³ |
| Oxidation Resistance | Excellent up to 1400°C |
| Atmosphere Compatibility | Oxidizing, Neutral, Partial Reducing |
🧩 Installation Notes
- High watt density
- Excellent thermal shock resistance
- Easy replacement
- Use ceramic terminal tubes for hot-end insulation
- Ensure uniform heating for long life
- Allow space for thermal expansion
- Use adjustable clamps or spring terminals
- Apply gradual startup ramping to avoid thermal shock
✅ Compliance & Standards
Conforms to IS, ASTM & DIN standards
Manufactured under ISO 9001:2015 quality systems