MoSi2 Heating Elements
W type MoSi2 heating elements for short furnace chambers and compact high-temperature electric furnace designs.
W-type silicon molybdenum rod: This specification is generally placed horizontally. Because there are more heating ends in the electric furnace, the thermal efficiency is high and the cost is saved.
W-shaped heating element is suitable for electric furnaces with a short furnace chamber and is more economical, because the sub-chamber requires fewer elements per unit length, and there are fewer cold end parts that cause heat loss, which greatly improves the thermal efficiency. When customizing products, customers need to provide the required product's heating end diameter, heating end length, cold end length, and center distance parameters.
Standard specifications are: d1x d2: Φ3/6, Φ4/9, Φ5/10, Φ6/12, Φ7/14, Φ9/18, Φ12/24 and other specifications.
W Shape, Material Grade 1700, D1=6mm,
D2=12mm, Le=300mm, Lu=250mm, A=50m
Specify：17, W, 6/12×300×250×50
W type MoSi2 elements are used for shorter furnace chambers and compact layouts. The listed W type reference data covers 1700 grade 6/12mm and 9/18mm elements.
| Reference group | Material grade | Diameter | Hot zone Le | Cold end Lu | Listed operating condition |
|---|---|---|---|---|---|
| W type | 1700 | 6/12mm | 315-1000mm | 470-630mm | Element 1500℃, furnace 1300℃, current 150A, surface load 14.5W/cm² |
| W type | 1700 | 9/18mm | 315-1000mm | 470-630mm | Element 1500℃, furnace 1300℃, current 275A, surface load 14.5W/cm² |
| Parameter | Technical value | Buyer note |
|---|---|---|
| Material grades | 1700 and 1800 | Specify RS17 or RS18 together with shape and dimensions. |
| Common diameter combinations | 3/6, 4/9, 5/10, 6/12, 7/14, 9/18, 12/24mm | D2 is generally twice the hot-end diameter D1. |
| Applicable temperature | 500-1700℃ | Avoid long-term operation at 400-700℃ because of low-temperature oxidation risk. |
| Air atmosphere limit | RS17: 1700℃; RS18: 1800℃ | Oxidizing atmosphere helps form the protective quartz glass film. |
| Nitrogen / inert atmosphere | RS17: 1600℃; RS18: 1700℃ | Confirm furnace atmosphere before selecting material grade. |
| Hydrogen | 1100-1450℃ | Send gas condition and target temperature for review. |
| Furnace temperature | Recommended hot-zone surface load |
|---|---|
| 1400℃ | <18 W/cm² |
| 1500℃ | <15 W/cm² |
| 1600℃ | <12 W/cm² |
| 1650℃ | <10 W/cm² |
| 1700℃ | <8 W/cm² |
For long service life, surface load should be selected together with furnace structure, atmosphere and operating temperature.
| Installation or operation item | Technical guidance | Buyer note |
|---|---|---|
| W type installation | Confirm the multi-shank layout, holder positions and chamber clearance against the furnace drawing. | Provide hot-zone and shank diameters, leg spacing and installed height; avoid mechanical stress on the hot zone. |
| Element holder | The holder bears the element weight and determines position. | Install carefully so the element is plumb. |
| Taper position | The lower taper part should extend into the furnace chamber. | Do not leave it in the furnace crown, which may cause local overheating. |
| Connection strap | Use aluminum braid wire or multi-layer aluminum foil. | The outside clamp secures the element and is not used as the conductor. |
| Clamp temperature | Generally not higher than 200℃. | Keep at least 50mm between the lower clip end and the upper brick surface. |
| Current limit note | 6/12mm should not be used long term at 170A; 9/18mm should not be used long term at 300A. | Send voltage, current and element diameter for review. |
| Furnace type | Temperature range | Voltage step |
|---|---|---|
| Small furnace, power below 100kW | 20-150℃ | 1/3 working voltage |
| Small furnace, power below 100kW | 150-500℃ | 2/3 working voltage |
| Small furnace, power below 100kW | 500℃ to working temperature | Full working voltage |
| Large furnace, power 100-500kW | 20-300℃ | 1/3 working voltage |
| Large furnace, power 100-500kW | 300-700℃ | 2/3 working voltage |
| Large furnace, power 100-500kW | 700℃ to working temperature | Full working voltage |
New or long-idle furnaces should be dried before use. For large furnaces, stronger monitoring is recommended during the drying process.
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