The temperature rating of a quartz tube, specifically the transparent type, can withstand up to 1100 degrees Celsius. However, its softening point is at 1270 degrees Celsius, and it should not be used for more than three hours at 1200 degrees Celsius.
The transparent quartz tube is highly resistant to thermal shock, capable of withstanding a temperature drop from 1000 degrees Celsius to room temperature. This resilience is due to its extremely low coefficient of thermal expansion and excellent electrical strength, which provide stability under temperature variations.
The softening point of the quartz tube, as mentioned, is 1270 degrees Celsius. This is the temperature at which the material begins to soften and lose its structural integrity. When operating at 1200 degrees Celsius, it is crucial to limit the usage to no more than three hours to prevent damage to the tube.
In terms of furnace operations, quartz tubes are used in horizontal split tube furnaces designed for maximum temperatures ranging from 1200°C to 1700°C. These furnaces are equipped with programmable temperature controllers that allow for precise heating and cooling rates, enhancing the efficiency and safety of operations involving high temperatures.
Fused quartz tubes, which are made from high-purity quartz crystals melted at 2000°C, offer superior optical and thermal properties compared to other types of glass. This high-temperature process ensures the material's purity and enhances its performance in high-temperature environments.
In summary, the quartz tube, particularly the transparent type, is designed to handle extreme temperatures, with a working range up to 1100 degrees Celsius and a softening point of 1270 degrees Celsius. Its ability to withstand thermal shock and maintain structural integrity at high temperatures makes it a valuable component in various high-temperature applications.
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