The operating temperature limits for 'one piece' and 'three piece' SiC resistors depend on the atmosphere (air or inert). In air or inert atmospheres like argon or helium, 'one piece' SiC resistors can operate up to 3100°F (1700°C), while 'three piece' resistors are limited to 2600°F (1425°C). These resistors can be connected in parallel or series, with parallel being preferred for balanced heating. Mounting considerations include avoiding tension and allowing for thermal expansion. Inert atmospheres, often using nitrogen or argon, prevent oxidation and contamination, making them ideal for high-temperature applications.
Key Points Explained:
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Temperature Limits by Resistor Type
- One Piece SiC Resistors: Maximum operating temperature of 3100°F (1700°C) in air or inert atmospheres (argon/helium).
- Three Piece SiC Resistors: Lower limit of 2600°F (1425°C) under the same conditions.
- These limits ensure stable performance and longevity, as exceeding them may degrade the resistors.
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Atmosphere Considerations
- Inert Gases (Argon/Nitrogen): Prevent oxidation and contamination, crucial for high-purity processes like semiconductor manufacturing.
- Air: While usable, air may introduce oxidation risks at extreme temperatures, making inert atmospheres preferable for critical applications.
- For specialized equipment like an mpcvd machine, inert gases ensure precise control over reactive environments.
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Electrical Configuration & Mounting
- Parallel vs. Series Connections: Parallel arrangements are preferred because they self-balance resistance over time, ensuring even heat distribution.
- Mounting Guidelines:
- Avoid tension to prevent mechanical stress.
- Allow free expansion/contraction (horizontal/vertical mounting).
- Use insulated supports for vertical setups.
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Purpose of Inert Atmospheres
- Protect sensitive materials from degradation during heating.
- Enable processes like CVD (Chemical Vapor Deposition) where reactive gases are introduced in controlled environments.
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Practical Implications for Purchasers
- Material Compatibility: Ensure resistor type aligns with operational temperatures and atmosphere requirements.
- System Integration: Consider mounting flexibility and electrical configurations for optimal performance.
- Cost vs. Purity: Nitrogen is cost-effective for general use, while argon suits high-purity needs.
These factors collectively guide equipment selection for high-temperature applications, balancing performance, safety, and cost.
Summary Table:
| Resistor Type | Max Temperature in Air/Inert (°F/°C) | Preferred Atmosphere | Key Considerations |
|---|---|---|---|
| One Piece SiC | 3100°F (1700°C) | Inert (Argon/Helium) | Higher temp limit, ideal for extreme heat |
| Three Piece SiC | 2600°F (1425°C) | Inert (Argon/Helium) | Lower temp limit, balanced heating in parallel |
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