Quartz glass, also known as fused quartz, is a high-purity material with exceptional thermal, optical, and chemical properties. Its temperature range depends on the specific application and environmental conditions. In general, quartz glass can withstand temperatures up to 1200°C in atmospheric conditions for short-term use, while long-term use is typically limited to 1100°C. Under vacuum conditions, the temperature limit is slightly lower, around 1000°C. Exceeding these temperatures can cause deformation or damage to the quartz glass. For higher temperature requirements, alternative materials like corundum are recommended.
Key Points Explained:
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Temperature Range in Atmospheric Conditions:
- Quartz glass can withstand temperatures up to 1200°C for short-term use in atmospheric conditions (1 atm).
- For long-term use, the recommended maximum temperature is 1100°C.
- Exceeding these limits can cause deformation or damage to the quartz glass.
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Temperature Range Under Vacuum:
- Under vacuum conditions, the temperature limit for quartz glass is reduced to 1000°C.
- This is due to the different thermal stresses and environmental factors under vacuum compared to atmospheric conditions.
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Material Properties Supporting High-Temperature Use:
- Low Coefficient of Thermal Expansion: Quartz glass has a very low thermal expansion, which makes it resistant to thermal shocks and suitable for high-temperature applications.
- High Softening Temperature: The material maintains its structural integrity at elevated temperatures, making it ideal for use in high-temperature environments.
- Chemical Purity and Resistance: Quartz glass is highly resistant to chemical corrosion, which is crucial in high-temperature environments where chemical reactions are more likely.
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Applications and Limitations:
- Optical Devices: Quartz glass is used in lenses and optical devices due to its superior ultraviolet transmission and optical clarity.
- Lighting Devices: High-purity quartz is used in high-temperature filament and arc lamps to reduce devitrification and extend lamp life.
- Tube Furnaces: Quartz tubes in tube furnaces are commonly used up to 1100°C for long-term use and 1200°C for short-term use. For higher temperatures, corundum tubes are recommended.
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Alternative Materials for Higher Temperatures:
- For applications requiring temperatures above 1200°C, materials like corundum are recommended due to their higher temperature resistance.
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Additional Properties of Quartz Glass:
- Optical Clarity: Quartz glass has excellent transparency from the ultraviolet to the infrared spectral range, making it suitable for broadband light-transmitting materials.
- Electrical Insulation: It has superior electrical insulation properties, which are important in high-temperature electrical applications.
- Chemical Resistance: Quartz glass is highly resistant to corrosion, making it suitable for use in chemically aggressive environments.
By understanding these key points, a purchaser can make informed decisions about the suitability of quartz glass for their specific high-temperature applications.
Summary Table:
| Condition | Temperature Limit | Usage |
|---|---|---|
| Atmospheric (Short-Term) | Up to 1200°C | Optical, Lighting |
| Atmospheric (Long-Term) | Up to 1100°C | Tube Furnaces |
| Vacuum | Up to 1000°C | High-Temperature |
| Alternative Material | Above 1200°C | Corundum Tubes |
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