Molybdenum Disilicide Heater

 

Molybdenum Disilicide Heater is a high-density ceramic heating element specifically designed for industrial and laboratory furnaces. It can achieve extreme temperatures of up to 1900°C (3452°F) in an oxidizing atmosphere. Its unique self-repairing feature and high power density make it an ideal alternative to traditional metal heating elements, especially suitable for high-temperature scenarios that require long-term stable operation.

 

 

1.Self-repair mechanism, extended service life

The core advantage of this MoSi₂ heating element lies in its high-temperature chemical stability. When heated in an oxidative environment (such as air), the surface of the component reacts with oxygen to form a continuous layer of silica (SiO₂, quartz glass). This layer effectively prevents further oxidation of the internal molybdenum disilicide core. If cracks appear on the surface of the component, the newly exposed MoSi₂ will immediately react with the atmosphere inside the furnace, re-forming the SiO₂ layer, achieving "self-repair", significantly enhancing the durability of the component under normal operating conditions.

 

2. Precise temperature control, suitable for various application scenarios

(1) Temperature range: The maximum operating temperature can reach up to 1900°C (surface temperature, depending on grade and atmosphere), and the recommended working range is from 500°C to 1700°C. Avoid operating for a long time in the 400°C to 700°C range to prevent "low-temperature oxidation" (powdering failure).

(2) Shape customization: Standard options include U, W, and L shapes, which facilitate the "cold end" (terminal) passing through the furnace wall; support for spiral, panoramic, or customized shapes is available to adapt to special furnace structures.

(3) Size specifications: Common diameter combinations are 3/6mm, 4/9mm, 6/12mm, 9/18mm, and 12/24mm (the D1 in the heat zone is thinner for efficient heating, while the D2 at the cold end is thicker to reduce resistance and protect the terminal).

 

3. Special conditions adaptation, reducing usage risks

(1) Atmosphere dependence: Requires oxygen to form a protective layer, suitable for environments such as air, oxygen, CO₂, and NO₂; in inert gases (Ar, He, Ne), the operating temperature needs to be reduced by 50-100°C; reducing-reduction atmosphere (H₂) or high vacuum environment will destroy the protective layer, leading to rapid failure (hydrogen requires a temperature drop to below 1450°C).

(2) Power control requirements: Resistance increases significantly with temperature rise; during cold start, the resistance is extremely low, requiring a controllable silicon power controller (SCR) for phase angle control to avoid current shock and damage to components or fuse blowout.

(3) Installation and maintenance: The element has high brittleness at room temperature (similar to ceramics), so it needs to be avoided from being impacted or bent; it is recommended to install vertically to accommodate thermal expansion; the furnace lining should use corundum bricks with low iron oxide (Fe₂O₃) content to prevent chemical erosion; the cold end should use aluminum braided clamps or asbestos clamps to ensure conductivity and prevent the connection terminals from overheating.

 

 

 

 

 

Item	Specification
Product Name	Molybdenum Disilicide Heater
Material	High-purity Molybdenum Disilicide (MoSi₂) ceramic composite
Structure	Dense ceramic resistor with hot zone + cold ends
Shape Types	U-type / W-type / L-type / Straight rod (custom available)
Max Operating Temperature	1600°C – 1800°C (up to 1850°C for high-grade versions)
Continuous Working Temperature	≤ 1700°C (recommended for long service life)
Working Atmosphere	Air (oxidizing atmosphere only)
Installation Position	Vertical suspension in furnace chamber
Resistance Type	Non-metallic, high-temperature ceramic resistance element
Heating Zone	Central hot zone with reduced diameter
Cold Ends	Enlarged diameter for low-resistance electrical connection
Voltage Range	110V / 220V / 380V (customizable)
Power Rating	Custom designed based on furnace requirements
Temperature Control	Compatible with PID temperature controllers
Oxidation Protection	Self-forming SiO₂ protective layer during operation
Electrical Properties	Stable resistance with minimal drift over time
Service Life	Long-life operation under proper thermal cycling conditions
Thermal Shock Resistance	Moderate (requires controlled heating/cooling cycles)
Applications	Ceramic sintering, heat treatment furnaces, laboratory furnaces, dental zirconia firing, glass processing, semiconductor thermal processes
Installation Requirement	Must avoid mechanical stress and rapid temperature changes
Maintenance	Periodic inspection for surface oxidation and structural integrity
Customization	Available in dimensions, shape, resistance value, and power design

 

 

 

 

 

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