Slot-Type (UX) SiC Heating Elements

UX Slot silicon carbide heating elements are non-standard heating components with precision-machined axial grooves on the surface of a uniform-diameter SiC rod. By altering the surface geometry, the effective heating area is significantly increased, and thermal radiation distribution is optimized, resulting in more uniform and gentler heat output. This design is particularly suitable for applications demanding high temperature uniformity, reduced surface load for extended element life.

Manufactured from high-purity green silicon carbide through recrystallization sintering at over 2200℃, the slot structure is integrally formed with the rod body, ensuring no coating peeling risk and high structural reliability.

Technical Parameter

OD: Outer Diameter (mm)

HZ: Hot Zone Length (mm)

CZ: Cold Zone Length (mm)

OL: Overall Length (mm)

Resistance: Ω

Specifications 

Parameter	Specification Range
Diameter	Φ12mm-φ50mm
Slot Configuration	U-groove, rectangular groove, V-groove, etc. (customizable)
Number of slots	2 – 8 (customizable)
Slot Depth	0.5mm – 3mm (customizable)
Slot Width	2mm – 10mm (customizable)
Hot Zone Length	100mm – 2000mm
Cold End Length	60mm – 400mm
Overall Length	Customized per request
Resistance	0.3Ω-5.0Ω（tested at105℃±50℃）
Surface Losd	Standard 8-12 W/cm², slot design effectively reduces peak load
Max Operating Temp	1450℃ oxidizing atmosphere

Structural Feature of UX Slot Type SiC Heating Elements

1. Axial Slot Surface

Multiple parallel grooves machined axially along the rod surface significantly increase effective heating area.

2.  Integral Formation

Slot structure sintered integrally with the rod body, eliminating coating peeling risk.

3. Customizable Slot Parameters

Slot profile, number, depth, and width can be flexibly designed based on process requirements.

4. Uniform Diameter

Consistent outer diameter between cold ends and slotted section allows uniform openings for easy replacement.

Key Advantages 

●Increased effective heating area: 

Slot structure increases effective heating area by 20-40%, reducing surface load under the same power

●Excellent temperature uniformity: 

Optimized thermal radiation distribution ensures more uniform and stable temperature field inside the furnace

●Extended service life: 

Reduced surface load effectively slows aging rate, extending service life

●High thermal efficiency: 

Improved thermal radiation characteristics enhance energy utilization

●High thermal shock resistance: 

Special slot structure disperses thermal stress, improving resistance to rapid temperature changes

●Easy installation: 

Uniform diameter design allows same installation method as standard SiC rods with no additional modifications

Applications

Industry	Typical Applications
Glass	Glass melting furnaces, feeders, annealing lehrs
Semiconductor	Tunnel kilns, roller kilns, shuttle kilns
Ceramics	Ceramic sintering, glaze baking
Heat Treatment	Large car bottom furnaces, pit furnaces
Powder Metallurgy	Large sintering furnaces, reduction furnaces
Chemical	High-temperature reactors, cracking furnaces

Slot Design Selection Guide

Slot Parameter	Recommended Application
U-Groove	Standard uniform heating,gentle thermal radiation
Rectangular Groove	Areas requiring higher thermal radiation intensity
V-Groove	Directional thermal radiation,localized enhanced heating
Multi-Slot	Significantly increase surface area,reduce surface load
Few-Slot	Balance thermal radiation intensity and mechanical strength

Installation Guidelines

· Furnace hole diameter should be 1.4-1.6 times the element diameter to allow thermal expansion

· Avoid impact on slotted area during installation to prevent groove damage

· Clamps should grip the smooth cold end surface, never on the slotted section

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

Operating Precautions

· Due to larger surface area in slotted zone, gradual temperature ramping is recommended for initial use

·  Regularly inspect grooves for foreign material accumulation or localized overheating marks

· Avoid prolonged use in reducing atmospheres to prevent SiC decomposition

· Avoid using hard tools to scrape the groove surface during cleaning

Customization Services

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

Customization Item	Description
Slot Parameters	Slot profile,count,depth,sidth can be freely combined
Segmented Slot	Multi-segment independent slot design
Graduated Slot	Gradual slot parameter variation along length
Resistance Value	Precisely matched to process requirements
Surface Coating	Optional anti-oxidation coating for extended life

For quotation or technical support, please provide:

· Diameter

· Hot zone length

·  Cold end length

·  Slot profile, count, depth, width

·  Resistance value

·  Operating temperature and atmosphere

·  Drawings or special requirements

UX Slot vs. Standard SiC Rods

Comparison	Standard Rod	UX Slot Rod
Effective Heating Area	Baseline	20-40%higher
Surface Load	Standard	15-25%lower(at same power)
Temperature Uniformity	Good	Excellent
Thermal Radiation	Radial uniform	Design-optimized
Service Life	Standard	10-20%longer
Cost	Baseline	Slightly 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.