Description for Double Spiral sic heating elements
Unlike standard U-shaped elements, Hongyuan's patented double spiral design delivers up to 30% higher surface load and 40% longer lifespan. Superior thermal uniformity reduces hot spots. Perfect for high-temperature kilns seeking lower maintenance and energy savings-backed by our 15-year ceramic industry expertise.
Parameters for Double Spiral sic heating elements
Specification Summary:
| Parameter | Value / Range |
|---|---|
| Material | High-purity recrystallized α-SiC |
| Helix Type | Double continuous spiral (dual thread) |
| Maximum Element Temperature | ≤ 1550°C |
| Recommended Continuous Use Temp. | 1400°C – 1500°C |
| Resistivity (Helix Zone, 25°C) | 0.8 – 1.2 Ω·cm |
| Resistivity (Cold End, 25°C) | 0.1 – 0.3 Ω·cm |
| Surface Load Range | 5 – 12 W/cm² |
| Power Tolerance | ±10% |
| Resistance Tolerance (Helix) | ±10% |
| Resistance Tolerance (Cold End) | ±15% |
| Temperature Uniformity (Helix Zone) | ≤ ±5°C |
Size Parameter (Customizable):
| Dimension | Range (mm) | Typical (mm) |
|---|---|---|
| Helix Outer Diameter (OD) | 20 – 60 | 35 |
| Helix Pitch | 6 – 15 | 10 |
| Heated Helix Length (Lh) | 100 – 800 | 300 |
| Cold End Length (Lc) | 150 – 400 | 250 |
| Total Length (Lt) | 400 – 2000 | 800 |
| Number of Threads | 2 (double start) | 2 |
Note:
1. The tolerance of resistance: matched sets are +/-5%, range for a shipment be +/-10%, shipment to shipment variation is +/-20%.
2. Products with special shapes are manuafactured upon customer's request.
Electric Property of Elements:
Ordering Information for HONGYUAN Double Spiral type sic heating elements
When ordering Double Spiral type silicon carbide heating elements, please provide the following parameters:
|
Model |
Outer diameter |
Length of heating part |
Cold end length |
Full length |
|
SCR |
OD, mm |
HZ, mm |
CZ, mm |
OL, mm |
E.g:
SCR type, OD=31.7mm, HZ=305mm, CZ=241mm,
OL=546mm, Resistance 4.46Ω
Expressed as:
Hongyuan Silca SCR, 31.7/305/546/4.46Ω
Note: Contact us for other specifications or customization.
Detail Drawings for SCR type sic heating elements
Advantages of HONGYUAN SCR Type Silicon Carbide Heaters:
Hongyuan vs. Conventional SiC Heating Elements
| Feature | Hongyuan Double Helical SiC | Conventional Recrystallized SiC |
|---|---|---|
| Manufacturing Process | Reaction-bonded | Recrystallized |
| Density | 2.8 g/cm³ | Lower, more porous |
| Oxidation Resistance | Superior (closed porosity) | Standard |
| Service Life | Multiple times longer | Baseline |
| Power Concentration | High (double helix) | Lower (straight or single helix) |
| Temperature Range | 600°C – 1600°C | Limited upper range |
| Customization | Full (OD, length, resistance) | Limited |
| Accessories | Premium ceramic + aluminum | Basic |
Hongyuan Double Helical SiC Heating Elements – Engineered for Longevity, Built for Precision.
Accessories for SCR type sic heating elements
FAQ for SCR type sic heating elements
Q: What is the typical price range for Hongyuan double spiral SiC heating elements?
A: The price typically ranges from $50 to $300 per piece, depending on factors such as diameter, heated length, cold end length, resistance value, and order quantity. Custom-designed elements or small-batch orders may be priced higher. For large-volume or OEM purchases, volume discounts are available. Please contact Hongyuan for a tailored quotation.
Q: How long is the service life of a double spiral SiC heating element?
A: Under normal operating conditions (clean air atmosphere, recommended surface load ≤12 W/cm², temperature ≤1500°C), the service life is typically 3,000 to 8,000 hours. Proper voltage control, avoiding thermal shock, and preventing contamination can significantly extend operational life.
Q: Can the double spiral SiC rod be used in reducing or vacuum atmospheres?
A: It is not recommended for reducing atmospheres (e.g., H₂, CO) or carburizing environments, as these will rapidly degrade the silicon carbide. In vacuum applications, the surface load must be derated by approximately 30–40% to prevent overheating and premature failure.
Q: What happens when the element ages, and how do I maintain power output?
A: As SiC heating elements age, their electrical resistance gradually increases. To maintain constant power output, a voltage-regulating device (e.g., SCR power controller or variable transformer) should be used to increase the applied voltage gradually. Without voltage adjustment, the element will lose heat output over time.
Q: Can I replace a failed straight SiC rod with a double helical one in an existing furnace?
A: Yes, in most cases. However, you must check the available mounting space, terminal position, and support configuration. Double helical elements have a wider heating zone and may require different clamping or support hardware. Hongyuan can provide retrofit guidance and adapt terminal lengths to match your furnace design.
Q: Are the cold ends coated, and why is that important?
A: Yes, Hongyuan cold ends are typically coated with nickel or aluminum. This coating minimizes contact resistance at the terminal connection, reduces localized heating, prevents oxidation of the clamping area, and ensures stable electrical performance over time. Uncoated cold ends can lead to overheating of the connection point and premature failure.
Q: What is the temperature uniformity across the double helical heating zone?
A: The temperature variation along the double helix zone is typically ≤ ±5°C under stable operating conditions. This excellent uniformity is a key advantage of the double-start spiral design, which provides balanced heat distribution and eliminates cold spots commonly found in single-helix or straight rod designs.
