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SGR-Type Silicon Carbide Heating Element
SGR-Type SiC Heating Element
SGR-Type SiC Heating Element

SGR-Type Silicon Carbide Heating Element

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SGR-Type SiC Heating Element – Product Details

The SGR-type silicon carbide heating element features a double-spiral cold-end design, which optimizes resistance distribution via spiral grooves to ensure uniform heating and high-efficiency energy conversion. With a high-density hot zone (up to 2.96 g/cm³) and a maximum service temperature of 1625°C, it is ideal for demanding high-temperature applications such as zirconia sintering, new energy battery material processing, and industrial kilns.

  • Product Name: SGR-Type Silicon Carbide Heating Element
  • Material: High-purity green α-SiC (hexagonal structure)
  • Voltage Range: 110–480V
  • Density: 2.65–2.96 g/cm³ (hot zone)
  • Service Life: Up to 2200 hours (continuous operation)
  • Diameter: 12–90 mm (cold/hot ends)

 

5D-Materials SGR-Type Silicon Carbide Rod—Product Advantages

  1. High Mechanical Strength: Bending strength of 100–120 MPa, resistant to shock and deformation at high temperatures.
  2. Corrosion/Oxidation Resistance: Made from high-purity SiC, suitable for harsh furnace atmospheres.
  3. Multi-Model Compatibility: Supports SG, SGR, U, W, M, ED/HD types, adaptable to diverse industrial furnaces (e.g., annealing, sintering, tube furnaces) .
  4. Energy-Efficient: Uniform heating with low energy consumption, meeting green industrial standards.
  5. ISO-Certified Production: Manufactured in ISO-certified facilities with an annual capacity of 500 tons.
  6. Export-Grade Packaging: Hard paper drum + foam liner + reinforced wooden case for safe transport.

 

SGR-type Silicon Carbide Heating Element - Applications

  1. Zirconia Processing: Sintering in dental furnaces and industrial zirconia (1450–1550°C), supporting open-crucible processes.
  2. Battery Materials: High-temperature processing with precise temperature control for consistent performance.
  3. Semiconductors: Wafer sintering, diffusion furnaces, and encapsulation heating.
  4. Optoelectronics: Heat treatment for laser diodes and solar cells.
  5. Automotive: High-temperature processing of electronic components and heat treatment.
  6. Industrial Furnaces: Ceramic sintering, glass manufacturing, and other high-uniformity heating applications.

 

Definition of Silicon Carbide Heating Element

The silicon carbide (SiC) heating element is a non-metallic resistor made from high-purity α-SiC, recrystallized at 2200°C. It operates on the Joule heating principle, converting electricity into heat upon current flow.

These elements feature a unique resistance-temperature relationship: a negative temperature coefficient (resistance decreases) below 800°C, switching to positive above 800°C. The maximum service temperature reaches 1500°C in air​ and up to 1625°C in specific atmospheres. A protective silica (SiO₂) layer forms at high temperatures, slowing oxidation. However, resistance increases irreversibly over time (aging), necessitating voltage adjustment to maintain constant power.

SiC heating elements are widely used in industrial kilns and experimental equipment for high-temperature processes, including sintering furnaces for ceramics/refractories, high-temperature furnaces for powder metallurgy and glass, semiconductor diffusion/annealing, and laboratory muffle furnaces.

 

SGR-Type Silicon Carbide Rod - Product Structure Diagram

Product Structure Explanation:

  • OD: Outer diameter (mm)
  • HZ: Hot zone length (mm)
  • CZ: Cold zone length (mm)
  • OL: Overall length (mm)
  • R: Ω (Customizable)

Example: SGR-type, OD=16mm, OL=250mm, HZ=100mm, R=3.96Ω , denoted as SGR-250×100×16​

Note: Contact us for other specifications or customization.

 

SGR-Type SiC Heating Rod Installation Method

  1. Inspection: Check for cracks before installation. Ensure no structural issues in the furnace affecting rod placement.
  2. Installation: Vertical or horizontal installation. Self-supporting at high temp, but furnace must allow free thermal expansion.
  3. Fixing: Install ceramic chucks/clamps on cold ends, ensure they are outside furnace to prevent overheating.
  4. Power Connection: Use flat aluminum braid and spring clamps to connect to 110–480V power supply, matching resistance correctly.
  5. Heating Debugging: Gradually increase to working temp to avoid thermal shock. Enter normal load after stable furnace temp.
  6. Regular Maintenance: Check aluminum-coated connectors and clamps for looseness or corrosion.
  7. Note: Installation should be performed by professionals. Contact us for detailed manuals.

 

SGR-Type Heating Scenario Design Recommendations

SGR-Type SiC Heating Element Configuration & Furnace Matching:

  • Mounting: Typically suspended (vertical)
  • Hot Zone: Must align with the furnace’s effective heating width; avoid contact with walls
  • Cold Zone Length: Furnace wall thickness + 50–150 mm external connection allowance. This prevents end overheating if too short and avoids an extended non‑heating zone if too long.
  • Furnace Port Size: Recommended port diameter is 1.4–1.6 times the cold end diameter. Seal with ceramic fiber gaskets to accommodate thermal expansion and prevent stress damage.
  • Spacing Design: Maintain a minimum distance of ≥3× element OD from furnace charge or walls. Center-to-center spacing between adjacent SiC rods should be ≥4× OD. This reduces radiation shielding and improves temperature uniformity.
  • Temperature Control System: An intelligent system is recommended for precise regulation, suppressing thermal shock and extending service life.
  • Atmosphere: Optimal in oxidizing atmospheres. For reducing, carburizing, or hydrogen-rich conditions, reduce operating temperature or implement protective measures. Contact us for specific application guidance.

 

SGR-Type Silicon Carbide Rod - Product Size Chart

Number Size Hot Zone surface area Nominal loading values*
External Diameter Hot Zone Length Cold End Length Overall Length
mm mm mm mm cm² Volts Watts Ohms
SGR-250*100*16 16 100 150 250 50 61 940 3.96
SGR-300*100*16 100 200 300 50 69 1060 4.49
SGR-350*100*16 100 250 350 50 77 1190 4.98
SGR-300*150*16 150 150 300 75 84 1290 5.47
SGR-350*150*16 150 200 350 75 91 1400 5.92
SGR-400*150*16 150 250 400 75 99 1520 6.45
SGR-300*200*16 200 150 350 100 106 1630 6.89
SGR-400*200*16 200 200 400 100 113 1740 7.34
SGR-450*200*16 200 250 450 100 121 1860 7.87
SGR-400*250*16 250 150 400 125 128 1970 8.32
SGR-450*250*16 250 200 450 125 135 2080 8.76
SGR-500*250*16 250 250 500 125 143 2200 9.3
SGR-550*250*16 250 300 550 125 151 2330 9.79
SGR-250*100*20 20 100 150 250 62 58 1110 3.03
SGR-300*100*20 100 200 300 62 65 1250 3.38
SGR-350*100*20 100 250 350 62 72 1380 3.76
SGR-300*150*20 150 150 300 94 80 1540 4.16
SGR-350*150*20 150 200 350 94 87 1670 4.53
SGR-400*150*20 150 250 400 94 94 1800 4.91
SGR-350*200*20 200 150 350 125 102 1960 5.31
SGR-400*200*20 200 200 400 125 109 2090 5.68
SGR-450*200*20 200 250 450 125 116 2230 6.03
SGR-400*250*20 250 150 400 157 124 2380 6.46
SGR-450*250*20 250 200 450 157 131 2520 6.81
SGR-500*250*20 250 250 500 157 138 2650 7.19
SGR-500*300*20 300 200 500 188 153 2940 7.96
SGR-550*300*20 300 250 550 188 160 3070 8.34
SGR-350*150*25 25 150 200 350 117 87 2000 3.78
SGR-400*150*25 150 250 400 117 92 2120 3.99
SGR-450*150*25 150 300 450 117 98 2250 4.27
SGR-400*200*25 200 200 400 157 110 2530 4.78
SGR-450*200*25 200 250 450 157 115 2650 4.99
SGR-500*200*25 200 300 500 157 121 2780 5.27
SGR-450*250*25 250 200 450 196 133 3060 5.78
SGR-500*250*25 250 250 500 196 139 3200 6.04
SGR-550*250*25 250 300 550 196 144 3310 6.26
SGR-600*300*25 300 300 600 235 167 3840 7.26
SGR-650*300*25 300 350 650 235 173 3980 7.52
SGR-700*300*25 300 400 700 235 179 4120 7.78
SGR-650*350*25 350 300 650 274 191 4390 8.31
SGR-700*350*25 350 350 700 274 196 4510 8.52
SGR-700*400*25 400 300 700 314 214 4920 9.31
SGR-400*200*30 30 200 200 400 188 90 2790 2.9
SGR-450*200*30 200 250 450 188 91 2820 2.94
SGR-500*200*30 200 300 500 188 91 2820 2.94
SGR-450*250*30 250 200 450 235 111 3440 3.58
SGR-500*250*30 250 250 500 235 111 3440 3.58
SGR-550*250*30 250 300 550 235 112 3470 3.61
SGR-600*300*30 300 300 600 282 132 4090 4.26
SGR-650*300*30 300 350 650 282 132 4090 4.26
SGR-700*300*30 300 400 700 282 133 4120 4.29
SGR-650*350*30 350 300 650 329 153 4740 4.94
SGR-700*350*30 350 350 700 329 153 4740 4.94
SGR-750*350*30 350 400 750 329 153 4740 4.94
SGR-700*400*30 400 300 700 376 173 5360 5.58
SGR-750*400*30 400 350 750 376 173 5360 5.58
SGR-800*400*30 400 400 800 376 174 5390 5.62
SGR-750*450*30 450 300 750 424 193 5980 6.23
SGR-800*450*30 450 350 800 424 194 6010 6.26
SGR-800*500*30 500 300 800 471 214 6630 6.91
SGR-400*200*35 35 200 200 400 219 89 3260 2.43
SGR-450*200*35 200 250 450 219 89 3260 2.43
SGR-500*200*35 200 300 500 219 90 3290 2.46
SGR-450*250*35 250 200 450 274 109 3990 2.98
SGR-500*250*35 250 250 500 274 109 3990 2.98
SGR-550*250*35 250 300 550 274 110 4030 3
SGR-600*300*35 300 300 600 329 130 4760 3.55
SGR-650*300*35 300 350 650 329 131 4790 3.58
SGR-700*300*35 300 400 700 329 131 4790 3.58
SGR-650*350*35 350 300 650 384 150 5490 4.1
SGR-700*350*35 350 350 700 384 151 5530 4.12
SGR-750*350*35 350 400 750 384 151 5530 4.12
SGR-700*400*35 400 300 700 439 171 6260 4.67
SGR-750*400*35 400 350 750 439 171 6260 4.67
SGR-800*400*35 400 400 800 439 172 6300 4.7
SGR-750*450*35 450 300 750 494 191 6990 5.22
SGR-800*450*35 450 350 800 494 191 6990 5.22
SGR-800*500*35 500 300 800 549 211 7720 5.77
SGR-400*200*40 40 200 200 400 251 86 3660 2.02
SGR-450*200*40 200 250 450 251 87 3700 2.05
SGR-500*200*40 200 300 500 251 87 3700 2.05
SGR-450*250*40 250 200 450 314 106 4510 2.49
SGR-500*250*40 250 250 500 314 107 4550 2.52
SGR-550*250*40 250 300 550 314 107 4550 2.52
SGR-600*300*40 300 300 600 376 127 5400 2.99
SGR-650*300*40 300 350 650 376 127 5400 2.99
SGR-700*300*40 300 400 700 376 127 5400 2.99
SGR-650*350*40 350 300 650 439 147 6250 3.46
SGR-700*350*40 350 350 700 439 147 6250 3.46
SGR-750*350*40 350 400 750 439 147 6250 3.46
SGR-700*400*40 400 300 700 502 167 7100 3.93
SGR-750*400*40 400 350 750 502 167 7100 3.93
SGR-800*400*40 400 400 800 502 167 7100 3.93
SGR-750*450*40 450 300 750 565 186 7910 4.37
SGR-800*450*40 450 350 800 565 187 7950 4.4
SGR-800*500*40 500 300 800 628 206 8760 4.84

Nominal load values measured at 1000°C in open air. Convert to current, tolerance is ±15% of center value.

Use the table above to select the rod type suitable for your application. Contact us for free samples if interested.

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