DB Type SiC Heating Elements

DB Type (Dumbbell) silicon carbide heating elements are specially structured SiC heating components featuring a dumbbell design with enlarged ends and a slender center. The slender central section serves as the hot zone while the thicker ends act as cold ends. This structure effectively reduces cold-end resistance, minimizes energy loss, improves thermal efficiency, and enhances mechanical strength and electrical conductivity at the cold ends.

Manufactured from high-purity green silicon carbide through recrystallization sintering at over 2200℃, the element is integrally formed with high structural strength. Widely used in precision heating applications with limited furnace space, high power density requirements, or specialized temperature profiles.

Technical Parameter

OD1: Outer Diameter (mm)

OD: Hot Zone Diameter (mm)

HZ: Hot Zone Length (mm)

CZ: Cold Zone Length (mm)

OL: Overall Length (mm)

Resistance: Ω

Specifications

Parameter	Specification Range
Hot Zone Diameter	Φ6mm-φ20mm
Cold End Diameter	Φ12mm-φ40mm
Hot Zone Length	50mm-800mm
Cold End Length	60mm-300mm(each side)
Overall Length	Customized per request
Resistance	0.3Ω-5.0Ω（tested at105℃±50℃）
Surface Losd	Hot zone up to15-25W/cm2
Max Operating Temp	1450℃Oxidizing atmosphere

Structural Feature of DB Type SiC Heating Elements

1. Dumbbell Structure

Special geometry with slender center and enlarged ends separates the functional roles of hot zone and cold ends.

2. Low Cold-End Resistance

Enlarged ends significantly reduce cold-end resistance, minimizing unnecessary heating and energy loss.

3. High Power Density in Hot Zone

Slender hot zone concentrates heat output, achieving high power density within limited space.

4. Superior Mechanical Strength

Enlarged ends enhance mechanical strength at cold ends, reducing fracture risk during installation and operation.

5. Integral Formation

Hot zone and cold ends integrally sintered with no joints, ensuring structural reliability.

Key Advantages

☆ High Thermal Efficiency: Low cold-end resistance minimizes energy loss, concentrating power in the hot zone

☆High Power Density: Slender hot zone delivers high power output within a compact space

☆ Superior Mechanical Strength: Enlarged ends enhance cold-end strength for safer, more reliable installation

☆ Long Service Life: Lower temperature rise at cold ends reduces oxidation rate, extending overall service life compared to uniform-diameter products

☆ Easy Installation: Larger cold ends provide greater clamp contact area for more stable connections

☆ High Adaptability: Ideal for applications with limited furnace space or localized high power density requirements

Applications

Industry	Typical Applications
Precision Heat Treatment	Localized quenching,small workpiece heating
Semiconductor	Diffusion furnaces,oxidation furnace zone enhancement
Laboratory	Small tube furnaces,gradient heating furnaces
Optical Fiber	Drawing furnace heating
Medical Equipment	Dental sintering furnaces,sterilization equipment
Analytical Instruments	Thermal analyzers,spectrometer sample heating

Installation Guidelines

· Furnace hole diameter should be determined based on cold end diameter, allowing 1.4-1.6 times for thermal expansion

· Clamps should grip the enlarged cold end, ensuring full contact and proper tightening to prevent arcing

· Avoid applying bending stress to the slender hot zone during installation

· When multiple elements are connected in parallel, resistance matching within 10% deviation is

Operating Precautions

· Due to higher power density in the hot zone, gradual temperature ramping is recommended for initial use

· Avoid prolonged use in reducing atmospheres to prevent SiC decomposition

· Regularly inspect terminal connections for looseness or oxidation

· Cold end temperature should be maintained within proper range to avoid overheating

Customization Services

We support non-standard customization based on drawings or parameters to meet various special operating conditions:

Customization Item	Description
Diameter Ratio	Adjustable diameter ratio between hot zone and cold ends
Transition Zone	Gradual or stepped transition available
Resistance Value	Precisely matched to process requirements
Special Lengths	Flexible customization of hot zone and cold end lengths
Surface Coating	Optional anti-oxidation coating for extended life

For quotation or technical support, please provide:

· Hot zone diameter and length

· Cold end diameter and length (each side)

· Resistance value

· Operating temperature and atmosphere

· Drawings or special requirements

Why choose DB Type?

Comparison	Straight	DB Type
Cold-End Resistance	Comparable to hot zone	Significantly reduced
Power Concentration	Distributed along entire length	Concentrated in slender section
Surface Load	8-12W/cm2	Hot zone up to15-25W/cm2
Applicable Furnace	Standard size	Space-constrained
Cold-End Strength	Standard	Enhanced
Energy Efficiency	Good	Higher

Equipment & Inspection

Note: Our silicon carbide heating elements undergo three rigorous quality inspections before being approved for shipment.

Packing&Transport

HHSIC Frequently Asked Questions

1. What are your factory's strengths?

· Modern production lines – Automated equipment with strict process control

· ISO9001 certified – Quality management throughout every stage

· In-house R&D team – Continuous development of new materials and custom designs

2. How do you ensure product quality?

We implement rigorous quality control at every step:

· All incoming raw materials are inspected

· Sintering processes are monitored in real time

· Every element undergoes resistance testing, visual inspection, and dimensional verification

· Each batch is traceable with complete test records

3. Is there a minimum order quantity?

No. Most standard models have no MOQ – you can order just one piece. We encourage trial orders before moving to larger volumes.

4. What are your typical lead times?

· Standard products: 7-10 days

· Custom products: 15-30 days (depending on complexity)

Expedited processing is available for urgent requirements.

5. How do you handle shipping?

Shipping is arranged based on order size and customer location:

· Small quantities: Sent via DHL, FedEx, or UPS for fast delivery

· Large orders or complete furnaces: Shipped by sea or air freight, with the most cost-effective route confirmed in advance

6. Where do you export?

We ship to over 50 countries across Europe, the Americas, Southeast Asia, the Middle East, and Africa. Available trade terms include EXW, FOB, CIF, and DDP.

7. What is your warranty policy?

· Heating elements (consumables): If manufacturing defects (cracks, incorrect dimensions, abnormal resistance) are found within 30 days of receipt, contact us for replacement. Normal wear from use is not covered.

· Lifetime technical support is always available.

8. Do you provide technical support?

Yes. Our engineering team offers:

· Installation guidance and operation training

· Troubleshooting and maintenance recommendations

· Full technical documentation for OEM clients

9. Can I get samples?

Yes. Samples of selected models are available free of charge; you only pay the shipping cost. This is the best way to verify performance and compatibility before placing a bulk order.