The quartz tube can withstand temperatures up to 1200°C, with a softening point of 1270 degrees. Its high temperature resistance is due to its purity and the low coefficient of thermal expansion, making it highly resistant to thermal shock.
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Temperature Resistance: Quartz tubes can withstand temperatures up to 1200°C, as mentioned in the reference. This is supported by the statement that the softening point of the quartz tube is 1270 degrees, indicating a high tolerance for heat. When used at 1200 degrees, it should not exceed 3 hours to prevent any potential damage due to prolonged exposure at such high temperatures.
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Thermal Shock Resistance: Quartz tubes are noted for their ability to withstand very high thermal shock, capable of transitioning from 1000 degree centigrade to room temperature without cracking or breaking. This is attributed to their extremely low coefficient of thermal expansion, which allows them to maintain structural integrity even under rapid temperature changes.
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Purity and Temperature Resistance: The temperature resistance of quartz tubes is directly related to their purity. Higher purity quartz tubes can withstand higher temperatures, making them suitable for applications requiring extreme heat resistance. This correlation between purity and temperature resistance is crucial in selecting the appropriate quartz tube for specific high-temperature applications.
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Applications and Material Comparison: Quartz tubes are commonly used in various high-temperature applications such as semiconductor production, thermocouple manufacturing, and vacuum brazing. They are preferred for their transparency, which aids in visual monitoring of processes. However, they may not withstand as many heat-cool cycles as other materials like alumina or superalloys. For applications requiring even higher temperatures, materials like alumina (up to 1800°C) or superalloys like Inconel are recommended.
In summary, quartz tubes are highly effective for applications requiring temperatures up to 1200°C, thanks to their high purity, low thermal expansion, and excellent thermal shock resistance. However, for applications exceeding these temperatures or requiring more heat-cool cycles, alternative materials like alumina or superalloys should be considered.
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