Thermal Elements
Silicon Carbide SiC Thermal Heating Elements for Electric Furnace
Item Number : KT-SH
Price varies based on specs and customizations
- Bulk Density
- 2.5 g/cm3
- Porosity
- 23%
- Thermal Conductivity
- 14-19 W/m·℃ (1000℃)
- Rupture Strength
- 50Mpa(25℃)
- Specific Heat
- 1.0 kj/kg·℃(25~1300℃)
- Coefficient Of Thermal Expansion
- 4.5×10-⁶
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Introduction
Silicon carbide (SiC) heating elements are high-temperature ceramic components used in electric furnaces, renowned for their high electrical conductivity and resistance to extreme temperatures. Made of silicon and carbon, these elements are formed through a recrystallization process at temperatures exceeding 2150°C, resulting in a long service life and high energy efficiency. SiC heaters are versatile and available in various configurations for applications ranging from 600°C to 1600°C, making them an ideal choice for industries such as metallurgy, ceramics, and semiconductor manufacturing.
Applications
Silicon carbide heating elements are widely used in machinery, metallurgy, light chemical industry, ceramics, semiconductors, analytical testing, and scientific research. They serve as electric heating elements for various electric furnaces, such as tunnel kilns, roller hearth kilns, glass kilns, vacuum furnaces, muffle furnaces, smelting furnaces, and various other heating equipment. Key applications for silicon carbide heating elements are as follows:
- Metallurgy: Silicon carbide heating elements are crucial in the production and processing of metals due to the high temperatures required for smelting and refining.
- Ceramics: In the ceramics industry, these elements are used in the firing and sintering processes, ensuring uniform heating and a high-quality end product.
- Glassmaking: Silicon carbide heating elements play a vital role in the melting and forming of glass, which requires sustained high temperatures.
- Chemical Processing: They are used in chemical reactors and processing equipment that require a controlled, high-temperature environment.
- Laboratory Furnaces: In scientific research and analytical testing, SiC elements are integral to laboratory furnaces used for a variety of high-temperature experiments and tests.
- Semiconductor Manufacturing: The precise temperature control provided by SiC heating elements is essential for the production of semiconductors and other electronic components.
- Environmental Testing: These elements are used in environmental test chambers to simulate extreme temperature conditions for product durability testing.
- Food Processing: In the food industry, silicon carbide heating elements are used in ovens and other equipment that requires high-temperature processing.
Details and Parts
Different Types of Silicon Carbide (SiC) Heating Elements
Advantages
Silicon carbide (SiC) heating elements offer numerous advantages, making them ideal for a variety of heating applications. These elements are made of a hard ceramic compound called silicon carbide, which offers high conductivity and exceptional durability. Here are some of the key advantages of using SiC heating elements:
- High-Temperature Performance: Silicon carbide heating elements operate efficiently in a temperature range of 600°C to 1600°C, making them ideal for high-temperature furnaces and processes.
- Energy Efficiency: These elements have low resistance at the hot end, which reduces wasted heat and improves the overall efficiency of the heating system, saving energy.
- Long Service Life: Due to their robust ceramic construction, silicon carbide heating elements offer a longer service life than other types of heating elements, especially in corrosive environments.
- Precise Temperature Control: The ability to precisely control and maintain temperature is crucial in many industrial processes. Silicon carbide elements provide more precise, controlled heat, improving product quality and consistency.
- Safety and Environmental Benefits: Using silicon carbide heating elements eliminates the need for fume exhaust, improving the safety and environmental impact of heating processes. This also contributes to a more comfortable working environment.
- Design Versatility: SiC heating elements are available in eight different basic configurations, allowing them to be customized for specific applications, extending their service life and effectiveness, especially in challenging environments.
- Cost-Effectiveness: Although initially more expensive than other heating elements, such as MoSi2, SiC elements offer long-term savings due to their energy efficiency and extended service life, thereby reducing overall operating costs.
- Enhanced Power Radiance: Silicon carbide heating elements can radiate higher power, which is beneficial for processes requiring rapid heating or high-temperature stability.
Features
The continuous-duty electrically heated pyrolysis furnace is a precision device designed specifically for continuous pyrolysis processes. It incorporates a range of features that enhance its functionality while ensuring operational safety, efficiency, and longevity. Key features include an extended service life, an internal rotation mechanism for continuous operation, and an advanced control system for safe and efficient management of the pyrolysis process.
- Extended Operating Life: The furnace utilizes indirect hot air to heat the reactor, significantly reducing damage and extending the equipment's service life.
- Internal Rotation for Optimal, Constant Operation: Unlike external rotating systems that require frequent seal material replacement, this furnace utilizes internal rotation technology.
- Advanced Control and Monitoring System: The furnace is equipped with an integrated control loop for real-time monitoring of key parameters. Additionally, improved burner management and automatic decoking further enhance furnace reliability and safety.
Characteristics
Physical Properties
| Property | Value |
|---|---|
| Bulk Density | 2.5 g/cm³ |
| Porosity | 23% |
| Thermal Conductivity | 14-19 W/m·°C (1000°C) |
| Fracture Strength | 50 MPa (25°C) |
| Specific Heat | 1.0 kJ/kg·°C (25-1300°C) |
| Thermal Expansion Coefficient | $4.5 \times 10^{-6}$ |
Chemical Properties
Silicon carbide heating elements are chemically stable and resistant to acids. However, alkaline substances can attack them at high temperatures.
Long-term use of silicon carbide components above 1000°C will cause the following effects when exposed to oxygen and water vapor:
① $SiC + 2O_2 \rightarrow SiO_2 + CO_2$ ② $SiC + 4H_2O = SiO_2 + 4H_2 + CO_2$
This gradually increases the $SiO_2$ content in the component, slowly increasing its resistance and leading to aging. Excessive water vapor accelerates SiC oxidation. The $H_2$ generated in reaction ② combines with $O_2$ in the air to form $H_2O$, creating a vicious cycle that shortens component life. Hydrogen ($H_2$) can reduce the mechanical strength of the component. Nitrogen ($N_2$) prevents SiC oxidation below 1200°C. However, above 1350°C, it reacts with SiC, decomposing it to produce chlorine ($Cl_2$), which completely decomposes it.
How to specify the model number of a silicon carbide (SiC) heating element?
The model number for a silicon carbide (SiC) heating element is specified based on its dimensions and resistance.
- OD: Outer Diameter
- HZ: Hot Zone Length
- CZ: Cold Zone Length
- OL: Total Length
For example: An SCR type with OD = 8mm, HZ = 100mm, CZ = 130mm, OL = 230mm, and a resistance of 4.46 ohms would be specified as: 8*100*230/4.46 ohms.
Available Ranges of SiC Heating Elements
| OD (mm) | HZ (mm) | CZ (mm) | OL (mm) | Resistance (ohms) |
|---|---|---|---|---|
| 8 | 100-300 | 60-200 | 240-700 | 2.1-8.6 |
| 12 | 100-400 | 100-350 | 300-1100 | 0.8-5.8 |
| 14 | 100-500 | 150-350 | 400-1200 | 0.7-5.6 |
| 16 | 200-600 | 200-350 | 600-1300 | 0.7-4.4 |
| 18 | 200-800 | 200-400 | 600-1600 | 0.7-5.8 |
| 20 | 200-800 | 250-600 | 700-2000 | 0.6-6.0 |
| 25 | 200-1200 | 250-700 | 700-2600 | 0.4-5.0 |
| 30 | 300-2000 | 250-800 | 800-3600 | 0.4-4.0 |
| 35 | 400-2000 | 250-800 | 900-3600 | 0.5-3.6 |
| 40 | 500-2700 | 250-800 | 1000-4300 | 0.5-3.4 |
| 45 | 500-3000 | 250-750 | 1000-4500 | 0.3-3.0 |
| 50 | 600-2500 | 300-750 | 1200-4000 | 0.3-2.5 |
| 54 | 600-2500 | 300-750 | 1200-4000 | 0.3-3.0 |
Installation Precautions
Click here to view precautions for installing silicon carbide rods.
Warnings
Operator safety is the top important issue! Please operate the equipment with cautions. Working with inflammable& explosive or toxic gases is very dangerous, operators must take all necessary precautions before starting the equipment. Working with positive pressure inside the reactors or chambers is dangerous, operator must fellow the safety procedures strictly. Extra caution must also be taken when operating with air-reactive materials, especially under vacuum. A leak can draw air into the apparatus and cause a violent reaction to occur.
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FAQ
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4.9
out of
5
Speedy delivery, excellent quality, and top-notch customer service. Thank you!
4.8
out of
5
The SiC heating element is a game-changer for our lab. It's efficient, durable, and has significantly improved our productivity.
4.7
out of
5
I'm impressed with the performance and longevity of this heating element. It's a reliable workhorse in our lab.
5.0
out of
5
Exceptional product! The SiC heating element delivers consistent results and has exceeded our expectations.
4.9
out of
5
Great value for money. The heating element is well-made and has held up well in our demanding lab environment.
4.8
out of
5
The SiC heating element is a reliable and efficient addition to our lab equipment. Highly recommended!
5.0
out of
5
Outstanding product! The heating element's durability and performance are unmatched. We're very satisfied with our purchase.
4.9
out of
5
The SiC heating element has proven to be an excellent investment. It's a high-quality product that delivers exceptional results.
4.7
out of
5
This heating element is a solid performer. It's easy to install and maintain, and it has met all our requirements.
5.0
out of
5
We're thrilled with the SiC heating element. It has significantly improved the efficiency of our lab processes.
4.8
out of
5
The heating element arrived promptly and was exactly as described. It's a great addition to our lab setup.
4.9
out of
5
The SiC heating element is a reliable workhorse. It's been operating flawlessly since we installed it.
4.7
out of
5
We're very satisfied with the performance of the heating element. It's a durable and efficient piece of equipment.
5.0
out of
5
The SiC heating element has exceeded our expectations. It's a top-quality product that has enhanced our lab's capabilities.
4.9
out of
5
We highly recommend the SiC heating element. It's a valuable addition to any lab.
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