Argon is better than nitrogen in certain applications for several reasons.
Firstly, argon is denser than nitrogen, which makes it more effective at purging moisture and oxygen from industrial applications. The molecules of argon disperse less easily compared to nitrogen, ensuring better insulation and protection against external elements. This property makes argon a preferred choice in industries where moisture and oxygen control are crucial.
Secondly, argon can be used at high temperatures above 1800°C without any risk of reaction. This makes it suitable for heat treatment processes that require extreme temperatures. In contrast, nitrogen may react with certain materials at high temperatures, which limits its usability in such applications.
Additionally, argon is considered more suitable for cooling purposes in vacuum furnaces compared to nitrogen. Although nitrogen is cheaper and has a faster cool rate, it has certain drawbacks. Nitrogen tends to be slightly decarburizing for steels and can form nitrates on the surface of certain alloys at temperatures above 1450°F. These effects make nitrogen less favorable for cooling in aerospace applications. On the other hand, argon offers a more stable and reliable cooling environment.
Moreover, argon is an inert gas and will not react with any material it comes into contact with. It is often used in applications where oxidation is undesirable, as it displaces oxygen effectively. Nitrogen, although also an inert gas, can react with oxygen under specific conditions, forming gases like nitric oxide and nitrogen dioxide. Therefore, argon is a better choice in situations where complete inertness is required.
Furthermore, argon has a wide range of applications in various industries. It can be used as a carrier gas in cinematography, as a blanket atmosphere for crystal growth, in cryosurgery, refrigeration, fire extinguishing, spectroscopy, airbag inflation, and more. Argon's versatility and abundance make it a cost-effective option for these applications.
In summary, argon is better than nitrogen in certain scenarios due to its higher density, ability to withstand high temperatures without reaction, better cooling performance, inertness, and wide range of applications. However, it is important to consider specific requirements and limitations of each gas before determining the most suitable option for a particular use case.
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