| Type: | Silicon Carbide |
|---|---|
| Material: | Silicon Carbide |
| Form: | Rod |
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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, silided under high temperature and re-crystallized.
| Material | SiC |
| Voltage | 220 volts, 380 volts, 110 volts |
| Shapes | Straight type, U type, W type, and etc. |
| SiC Content | above 99% |
| Color | gray |
| Resistence | Uniform resistance |
| Power | Adjustable |
| Working temperature | up to 1400C |
It is widely used in various high temperature electric furnacesand other electric heating devices, such as in the industries of magnet, ceramics, powder metallurgy, glass, metallurgy and machinery, etc.
«Aluminum die casting
«Laboratory furnace
«Aluminum melting and holding furnace
«Rotary hearth furnace
«Continuous furnace
«Crucible furnace for non
«Glass Feeder ferrous metals
| Diameter | Heating zone | Cold zone | Overall length | Range of resistance |
| Length | Length | |||
| 8mm | 100-300mm | 60-200mm | 240-700mm | 2.1-8.6 ohms |
| 10mm | 100-300mm | 60-300mm | 240-900mm | 0.8-7.0 ohms |
| 12mm | 100-500mm | 150-350mm | 400-1200mm | 0.7-5.6 ohms |
| 14mm | 100-500mm | 150-350mm | 400-1200mm | 0.7-5.6 ohms |
| 16mm | 200-600mm | 150-350mm | 500-1600mm | 0.7-4.4 ohms |
| 18mm | 200-800mm | 150-400mm | 500-1600mm | 0.7-5.8 ohms |
| 20mm | 200-800mm | 200-600mm | 600-2000mm | 0.6-6.0 ohms |
| 25mm | 200-1200mm | 250-700mm | 700-2600mm | 0.4-5.0 ohms |
| 30mm | 300-2000mm | 250-800mm | 800-3600mm | 0.4-4.0 ohms |
| 35mm | 400-2000mm | 250-800mm | 900-3600mm | 0.5-3.6 ohms |
| 40mm | 500-2700mm | 250-800mm | 1000-4300mm | 0.5-3.4 ohms |
| 45mm | 500-3000mm | 250-750mm | 1000-4500mm | 0.3-3.0 ohms |
| 50mm | 600-2500mm | 300-750mm | 1200-4000mm | 0.3-2.5 ohms |
| 54mm | 600-2500mm | 300-750mm | 1200-4000mm | 0.3-3.0 ohms |
| 60mm | 600-2500mm | 300-750mm | 1200-4000mm | 0.3-3.0 ohms |
Physical Property
| Specific Gravity | 2.6~2.8g/cm3 | Bend Strength | >300kg |
| Hardness | >9MOH'S | Tensile Strength | >150Kg.cm3 |
| Porosity Rate | <30% | Radiancy | 0.85 |
Recommended surface load
| Furnace temperature | 1100 | 1200 | 1300 | 1350 | 1400 | 1450 |
| Surface load of hot zone (w/cm²) | <17 | <13 | <9 | <7 | <5 | <4 |
Chemistry Property
1. Anti-oxidation Property of Elements
The element start to being oxixdized when heat to 800°C in air, and a SiO2 protect film will be generated in surface of hot zone when temperature get to 1000-1300°C; cristobalite will be crystallized at 1300°C; the protect film get to a certain thinckness when the temperature get to 1500°C which make the oxidation speed being very slow to stable. If continue to heat to over 1627°C, the protect film will be damaged and oxidation speed will be more rapid evidently and make the element damaged earlier.
Though the element will be oxidized very slowly in course of application, it also will make the resistance increased following long time application, this phenomenion calls ageing, in order to lower the ageing speed, we use special technology to spread a protect film on the surface of hot zone in the course of production, which enhance the antioxidant property of element evidently and lengthen the service life.
2. The Effects of Alkali and Alkaline Metal Oxide to Elements.
The alkali and alkaline metal oxide will react with SiC at about 1300°C and generate silicate, which calls alkali-chemical corrosion, and can influence the glowing of element.
3. The Effects to Elements from Melting Metal
Some metals ,such as cobalt, nickel, chrome and so on, can corrade the element in high temperature melting state and affect the service life of element.
Electric Property
SiC heating elements have rather large specific resistance, when it is heated in air and the surface temperature of the hot zone reaches 1050°C, it's resistance rate is 600-1400mm2/mm, its resistance value changes as the temperature rises. From room-temperature to 800°C is negative value, over 800°C is positive value.
Notice for using and installing SIC heater:
1. Be protected against damp during storing or installing to ensure the performance ;
2. Divided before assembling. The tolerance of the resistance of each one cannot exceed by 10% each other;
3. Be careful when using and maintaining;
4. When operating the electric furnace at the beginning, the voltage should be increased slowly and cannot be fully loaded at once. Otherwise the larger current will be resulted in the damage of heater.
5. When heater is damaged and need to be changed, the resistance of new ne should follow the increasing resistance. If many are damaged or resistance increased too much, heater should be changed.
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