The high temperature of quartz, specifically in its fused form, can withstand temperatures up to 1000°C due to its high purity and low coefficient of thermal expansion. This property makes it resistant to thermal shock and superior in optical and thermal properties compared to other types of glass.
Explanation:
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High Purity and Melting Process: Quartz is made by fusing or melting naturally occurring quartz crystals, which are of very high purity. This process occurs at a temperature of 3632°F (2000°C), requiring a high-temperature furnace. The high purity of the quartz used contributes to its ability to withstand extreme temperatures without compromising its structural integrity or optical clarity.
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Thermal Resistance and Shock: The transparent quartz tubes, which are commonly used in various applications, can withstand temperatures up to 1100°C. This high thermal resistance is due to the extremely low coefficient of thermal expansion of quartz. This property allows quartz to withstand rapid temperature changes (thermal shock) from 1000°C to room temperature without cracking or breaking.
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Comparison with Other Materials: In comparison to other materials like Pyrex, which softens at 820°C, quartz has a much higher melting point of 1670°C. This makes quartz more suitable for applications requiring exposure to high temperatures for extended periods. For example, quartz is recommended for baking at 1000°C for at least an hour, whereas Pyrex is suitable only up to 500°C.
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Impact on Thermocouples: It is also noted that over time, quartz pollution can affect thermocouples, leading to inaccurate temperature readings. This can result in actual firing temperatures being up to 100°C higher than programmed, highlighting the importance of monitoring and maintaining thermocouple accuracy in high-temperature environments involving quartz.
In summary, the high temperature resistance of quartz, particularly in its fused form, is a result of its high purity and unique physical properties, making it an ideal material for high-temperature applications.
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