The inert gas commonly used in heat treat ovens is nitrogen (N2), argon (Ar), and helium (He). These gases are chosen for their non-reactive properties, which are crucial in preventing oxidation and other chemical reactions that could degrade the materials being processed.
Nitrogen (N2) is often used in heat treatment processes, particularly for non-ferrous metals like copper, brass, and aluminum. It is considered inert at temperatures below 1800°C and effectively displaces oxygen, reducing the risk of oxidation. However, it is important to note that under specific conditions, nitrogen can react with oxygen to form gases like nitric oxide (NO) and nitrogen dioxide (NO2), collectively known as NOx gases. Despite this, nitrogen is a cost-effective choice for creating an inert atmosphere when the material being treated does not react with it.
Argon (Ar) and Helium (He) are also frequently used in heat treatment processes. These gases are more inert than nitrogen and are particularly useful in high-temperature applications where the risk of chemical reactions is higher. Argon and helium are often used in combination with nitrogen or each other to create a more stable and inert environment. For instance, the KT Series inert gas oven operates with a mix of nitrogen and argon, capable of reducing the oxygen level to less than 20ppm, which is essential for processes like firing LCD glasses and inert metal treatment.
In summary, the choice of inert gas in heat treat ovens depends on the specific requirements of the material being processed, the temperature range, and the desired level of inertness. Nitrogen is commonly used due to its cost-effectiveness and effectiveness at lower temperatures, while argon and helium provide higher levels of inertness, making them suitable for more demanding applications.
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