MoSi2 (molybdenum disilicide) heating elements are widely used in high-temperature industrial applications due to their excellent oxidation resistance and thermal stability. The two primary models, BR1700 and BR1800, operate at 1600°C and 1700°C, respectively. Their durability stems from a low thermal expansion coefficient and the formation of a protective SiO2 layer at high temperatures. These properties make them ideal for processes like metal heat treatment in tubular furnaces, though care must be taken in reducing atmospheres to prevent spalling.
Key Points Explained:
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MoSi2 Heating Element Models and Working Temperatures
- BR1700: Designed for continuous operation at 1600°C.
- BR1800: Capable of reaching 1700°C, suitable for extreme high-temperature applications.
- These high temperature heating elements are preferred for their stability and efficiency in industrial furnaces.
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Key Properties Enhancing Performance
- Oxidation Resistance: A protective SiO2 layer forms at high temperatures, preventing further oxidation.
- Low Thermal Expansion: Minimizes deformation under thermal stress, ensuring longevity.
- Mechanical Strength: Resists breakage compared to alternatives like SiC, reducing maintenance needs.
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Common Applications
- Used in tubular furnaces for metal/alloy heat treatment.
- Ideal for processes requiring consistent, high-temperature environments (e.g., ceramics, glass manufacturing).
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Challenges and Solutions
- Spalling Risk: Occurs in reducing atmospheres where the SiO2 layer cannot regenerate.
- Solutions:
- Regeneration firing in oxidizing atmospheres at 1450°C.
- Using elements with thicker SiO2 layers for harsh conditions.
- Solutions:
- Spalling Risk: Occurs in reducing atmospheres where the SiO2 layer cannot regenerate.
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Comparison with SiC Heating Elements
- MoSi2 Advantages: Better oxidation resistance, higher temperature tolerance.
- SiC Advantages: Superior mechanical strength, less prone to breakage.
- Choice depends on specific process requirements (e.g., temperature vs. mechanical stress).
These insights help purchasers select the right model based on temperature needs, environmental conditions, and operational durability.
Summary Table:
| Model | Working Temperature | Key Features |
|---|---|---|
| BR1700 | 1600°C | Continuous operation, oxidation-resistant |
| BR1800 | 1700°C | Extreme high-temp applications, durable |
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