The high temperature of quartz tube can reach up to 1100 degrees Celsius for transparent quartz tubes, and the softening point of the quartz tube is 1270 degrees Celsius.
Explanation:
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Temperature Resistance of Transparent Quartz Tubes: Transparent quartz tubes are capable of withstanding temperatures up to 1100 degrees Celsius. This high-temperature resistance is due to the nature of the raw materials used, which include both natural and synthetic quartz sand. These materials are chosen for their extremely low coefficient of thermal expansion, which makes them highly resistant to thermal shock. This means they can handle rapid temperature changes from 1000 degrees Celsius to room temperature without cracking or breaking.
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Softening Point of Quartz Tubes: The softening point of the quartz tube, as mentioned, is 1270 degrees Celsius. This is the temperature at which the quartz begins to lose its structural integrity and starts to deform. It is advised that when using the quartz tube at 1200 degrees Celsius, it should not be maintained at this temperature for more than three hours to prevent reaching the softening point and causing damage to the tube.
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Impact of Purity on Temperature Resistance: The temperature resistance of the quartz tube is also influenced by its purity. Higher purity quartz tubes can withstand higher temperatures. This is because impurities can lower the melting and softening points of the material, making it less capable of withstanding extreme heat. The fused quartz tubes, which are made from high-purity quartz crystals, demonstrate superior optical and thermal properties due to their high purity, making them suitable for applications requiring high-temperature resistance.
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Maintenance and Safety Considerations: When using quartz tubes in high-temperature environments, it is crucial to follow proper maintenance and safety protocols. For instance, when dealing with hydrogen gas, it is important to ensure that the hydrogen content does not exceed the explosive limit and that appropriate safety measures are in place. Additionally, when using stainless steel pipes for hydrogen, due to their higher thermal conductivity compared to quartz, water cooling at the ends is necessary to prevent overheating and ensure the integrity of seals.
In summary, the high temperature resistance of quartz tubes, particularly transparent ones, makes them ideal for various high-temperature applications. However, it is essential to consider the softening point and the duration of exposure to high temperatures to prevent damage and ensure safety.
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