SiC Heating Elements
W type silicon carbide rod heaters for furnace replacement projects, covering SiC rod dimensions, leg spacing, phase resistance, atmosphere and RFQ data.
The silicon carbide heating element is a kind of non-metal high temperature electric heating element. It is made of selected super quality green silicon carbide as main material.which is made into blank,silicided under high temperature and re-crystallized. Compared with metal electric heating element,this kind of element is characterized by high-applied temperature,anti-oxidization,easy installation and maintenance. Therefore, it is widely used in various high temperature electric furnaces and other electric heating devices, such as in the industries of magnet, ceramice, powder metallurgy, glass metallurgy and machinery,etc.
1. High working temperature: 1400C.
2. Long time last.
3. Varous type available. Rod, U, W, Single Spiral, Double Spiral.
1. High working temperature: 1500C (Surface Temperature)
2. Various shapes: Rod, U, W, Single Spiral, Doule Spiral shapes are availible.
3. Large size range: Diameter 14-54mm, Length 200-4500mm.
4. Fast Delivery: Normal quantity can be ready in 10 days.
5. Very competitive prices.
1. SiC Heating rod is heated in the air after the formation of a silicon oxide film compact surface,Into a protective film to protect the antioxidant, play a role in prolonging life. In recent years, our company developed a variety of silicon carbide coating to prevent cracking, for a variety of gas furnace.
2. Continuous use of silicon carbide, hoping to slow increasing resistance to maintain long life.
3. Globar as far as possible in parallel. If the silicon carbide with different resistance and series resistance of silicon carbide rod load, resulting in a rapid increase in a silicon carbide rod resistance, shorter life expectancy.
4. After the silicon carbide rod with the temperature higher lifetime is shorter, so in the furnace temperature super 1400 DEG C, accelerate the oxidation rate, shorten life. Use note try not to let the silicon carbide surface temperature is too high.
W type silicon carbide rod heaters are usually reviewed when a furnace needs a bent or multi-leg SiC element rather than a straight rod. The buyer should confirm whether the old element is truly W type, whether the terminal side is fixed, and whether the furnace wiring expects a three-phase shaped element.
| Buyer question | What to check before RFQ | Why it matters |
|---|---|---|
| Is the furnace layout suitable for W type SiC? | Chamber height, wall openings, terminal side, element spacing and support method. | A W type rod may solve compact layout needs, but the bend and leg spacing must fit the chamber. |
| Can the old element be identified from photos? | Front photo, side photo, broken-piece length, terminal photo and any old drawing. | Visual evidence helps separate W type, U type and other custom SiC shapes. |
| Is resistance balanced across phases? | Phase resistance, voltage, current, power and connection method for each group. | Three-phase W type replacements need close electrical matching to avoid uneven load. |
| Will the atmosphere change the practical limit? | Air, nitrogen, hydrogen, vacuum, sulfur-containing gas, moisture and duty cycle. | Atmosphere affects service temperature, surface load and replacement risk. |
W type SiC elements are three-phase shaped elements. The specification review should include shape dimensions and electrical grouping information.
| Dimension code | Meaning | What buyers should provide |
|---|---|---|
| OD or Dia | Element outside diameter | Measure the rod body or provide the drawing dimension. |
| HZ | Hot zone length | Match the active heating area inside the furnace chamber. |
| CZ | Cold end length | Match wall thickness, terminal position and connection space. |
| OL | Overall length | Measure the full element length from end to end where applicable. |
| A / D | Leg center distance or connection bridge | Required for U, CU and W shaped elements. |
Use the general SiC rod range of 8-54mm diameter and up to 4300mm listed length as a starting reference, then confirm final W type dimensions from the furnace drawing or sample. For three-phase circuits, keep phase resistance closely matched, and use a 4-line star connection where possible to help maintain phase voltage balance.
Searches such as silicon carbide heating element furnace, silicon carbide rod heater and sic rod often come from replacement work where the buyer knows the furnace but not the exact element specification. For W type SiC rod heaters, the RFQ should connect furnace fit, dimensions and electrical data.
If the buyer only has a broken element, send the longest measurable pieces, terminal photos and furnace opening dimensions. Mark uncertain values as unknown instead of guessing the hot zone or leg spacing.
| Operating item | Technical value | Buyer note |
|---|---|---|
| Maximum element temperature | Up to 1600℃ in clean dry air | Atmosphere may reduce the practical service temperature. |
| Recommended surface loading | 3-8 W/cm² for furnace design | Lower surface loading is preferred when longer service life is required. |
| Resistance measurement | Measure at 1000℃ or above from voltage and current | Room-temperature resistance does not represent high-temperature resistance. |
| End of functional service life | Resistance reaches 3 times the original value | Keep voltage, current and resistance records for later replacement. |
| New element operation limit | Voltage not over 80% of test value; power not over 65% of test value | Use rated test values only for calibration review. |
The following installation and electrical rules are useful for furnace builders and replacement projects.
| Item | Recommendation | Why it matters |
|---|---|---|
| Element center to element center | Minimum 2 times element diameter; 2.5-3 times is recommended | Helps reduce local overheating and short-circuit risk. |
| Element center to furnace wall | At least 1.5 times element diameter | Leaves space for heat radiation and installation tolerance. |
| Element center to heated product | At least 2 times element diameter | Helps avoid direct obstruction and uneven radiation. |
| Preferred circuit connection | Parallel connection is preferred where possible | Small resistance changes tend to balance during use. |
| Series connection | Up to 4 elements when resistance is well matched; limit to 2 above 1400℃ | Reduces overload risk when resistance changes over time. |
| Resistance matching | Series: +/-5%; parallel: +/-10% | Useful when grouping elements for replacement and maintenance. |
| Voltage reserve | Usually 50%-100% above the voltage required by new elements | Allows the power supply to compensate for resistance aging. |
FAQ
Choose W type SiC rod heaters when the furnace layout, wiring side or chamber space requires a bent or multi-leg SiC element rather than a straight DB or ED rod. Confirm the decision with drawings, photos, leg spacing, resistance and furnace atmosphere.
Send outside diameter, hot zone length, cold end length, overall length where applicable, leg center distance, connection bridge dimensions, terminal photos, furnace wall thickness and replacement drawings or photos.
W type SiC elements are often reviewed as three-phase shaped elements. Phase resistance should be closely matched so the furnace does not load one phase harder than the others during operation.
A furnace name is not enough. The supplier needs element shape, dimensions, electrical data, atmosphere, working temperature, quantity and photos or drawings before confirming a suitable W type replacement.
Buyer Resources
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Request A Quote
For faster review, include element type, diameter, hot zone length, cold end length, resistance, furnace temperature, quantity and application.
