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U-Type molybdenum disilicide（MoSi2) heating elements are intermetallic heating components manufactured primarily from MoSi₂ through high-temperature sintering. Featuring a U-shaped configuration with parallel upward terminals, they allow concentrated wiring from the furnace top. In high-temperature oxidizing atmospheres, a dense SiO₂ protective layer forms on the surface, providing excellent oxidation resistance and high-temperature stability, with maximum operating temperatures up to 1800℃.
Manufactured using advanced sintering technology, the hot zone and cold ends are integrally formed for structural reliability. The U-shaped configuration is particularly suitable for deep pit furnaces, vertical furnaces, and equipment requiring top wiring, making it an ideal choice in high-temperature industrial heating applications.
Technical Parameter
Diameter (d/c,mm) | Le(hot zone) Length | Lu(cold zone) Length | c(mm) | d(mm) | f(mm) | g(mm) | A(mm) Std/Min |
3/6 | Customizable | Customizable | 6 | 3 | 25 | 15 | 25/16 |
4/9 | Customizable | Customizable | 9 | 4 | 25 | 15 | 25/19 |
6/12 | Customizable | Customizable | 12 | 6 | 45 | 25 | 50/26 |
9/18 | Customizable | Customizable | 18 | 9 | 75 | 30 | 60/38 |
12/24 | Customizable | Customizable | 24 | 12 | 100 | 40 | 80/54 |
Material Grade: 1700/1800/1850
d/c: Hot zone/cold zone diameter(mm)
Le: Hot zone length(mm)
Lu: Cold zone length(mm)
A: Shank spacing(mm)
Customization Services
We support non-standard customization based on drawings or parameters to meet various special operating conditions:
Customization Item | Description |
Center Distance | Customizable within40-200mm |
Cold End Length | Adjustable based on furnace top thickness |
Resistance Value | Precisely matched to process requirements |
Special Shapes | W-shape,multi-U,and other complex structures |
High-Temperature Grade | Standard 1700℃/High-temp grade 1800℃ |
For quotation, please provide:
· Hot zone diameter and length
· Cold end diameter and length (each side)
· Center distance
· Resistance value (at room temperature)
· Operating temperature and atmosphere
· Drawings or special requirements
U-Type MoSi2 Heating elements Structural Features
1. U-Shape Configuration
Parallel upward terminals allow concentrated wiring from the furnace top, eliminating sidewall openings and simplifying furnace construction.
2. Concentrated Hot Zone
Heat is concentrated at the bottom, enabling precise heating of specific zones and improving thermal efficiency.
3. Integral Formation
Hot zone and cold ends integrally sintered with no joints, ensuring high structural strength.
4. Aluminum-Sprayed Cold Ends
Cold ends are aluminum-sprayed to significantly reduce contact resistance and improve electrical reliability.
5. Variable Diameter Design
Hot zone diameter is smaller than cold end diameter, effectively reducing cold end temperature and minimizing energy loss.
U-Type MoSi2 Heating elements Key Advantages
●Extremely High Temperature Resistance
Operating up to 1700-1800℃ in oxidizing atmospheres, suitable for ultra-high-temperature processes
● Excellent Oxidation Resistance
Dense SiO₂ protective layer provides outstanding oxidation resistance and long service life
● Rapid Heating
Low thermal inertia allows fast temperature ramping, ideal for intermittent production
● Outstanding High-Temperature Stability:
Minimal deformation at high temperatures, stable resistance, controllable temperature field
●Clean Wiring
All terminals concentrated at the furnace top for easy maintenance and enhanced safety
● Flexible Installation
Can be vertically suspended or bottom-supported to suit different furnace designs
U-Type MoSi2 Heating elements Applications
Industry | Typical Applications |
Semiconductor | Diffusion furnaces,oxidation furnaces,annealing furnaces |
Glass | Glass melting furnaces,feeders,platinum channels |
Ceramics | Electronic ceramic sintering,structural ceramic sintering |
Metallurgy | Power metallurgy sintering,metal heat treatment |
Laboratory | High-temperature tube furnaces,box furnaces,vacuum furnaces |
New Energy | Lithium battery material sintering,photovoltaic materisl processing |
Installation & Operating Precautions
Installation Guidelines
· Furnace top openings should be 1.4-1.6 times the cold end diameter to allow thermal expansion
· Both legs must remain vertically parallel to avoid torsional stress
· Clamps must make full contact with aluminum-sprayed cold ends and be tightened properly to prevent arcing
· When multiple elements are connected in parallel, resistance matching within 5% deviation is recommended
Operating Precautions
· MoSi₂ elements are brittle at low temperatures; avoid impact and mechanical stress during installation and operation
· Gradual temperature ramping is required for initial use; preheating between 200-400℃ is recommended to avoid thermal shock
· Avoid prolonged use in the 400-700℃ range, as low-temperature oxidation can damage the element
· Not suitable for reducing atmospheres, nitrogen atmospheres (above 1350℃), or vacuum environments (at high temperatures)
MoSi₂ vs. SiC Heating Elements
Comparison | SiC Heating Elements | MoSi2 Heating Elements |
Max Operating Temperature | 1450℃ | 1700-1800℃ |
Applicable Atmosphere | Oxidizing,neutral | Reducing Oxidizing only |
Low-Temperature Brittleness | Yes | Yes(more pronounced) |
High-Temperature Softrning | None | Above1500℃ |
Resistance Characteristics | Increases with aging | Relatively stable |
Cost | Lower | 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?
· Established in 2004 – Nearly 20 years of industry experience
· 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.
