The properties of fluid used in diffusion pumps, particularly polyphenyl ether and perfluoropolyether, are characterized by their low vapor pressure, resistance to degradation, and chemical inertness. Polyphenyl ether is notable for its low vapor pressure and resistance to electron bombardment, making it suitable for high-vacuum applications. Perfluoropolyether, on the other hand, is highly inert to oxygen, halogens, and acids, and decomposes into a gas without compromising the main fluid, although it is toxic upon decomposition.
Polyphenyl Ether: Polyphenyl ether is chosen for its very low vapor pressure, which is crucial for maintaining a high vacuum in diffusion pumps. Its resistance to electron bombardment is particularly beneficial in environments where the pump may be exposed to high-energy particles, such as in electron-beam microscopy or vacuum deposition processes. Although more expensive than silicone oil, its performance characteristics make it a preferred choice for specific applications where high vacuum and stability under electron bombardment are required.
Perfluoropolyether: Perfluoropolyether is a type of fluid where all hydrogen atoms in a hydrocarbon are replaced with fluorine atoms, resulting in a higher molecular weight and enhanced chemical stability. This fluid is inert to many aggressive chemicals, including oxygen, halogens, and acids, which makes it ideal for use in environments where such substances may be present. Its decomposition into a gas upon breakdown ensures that the main fluid remains intact, although the gas produced is toxic and requires careful handling and containment.
General Considerations for Diffusion Pumps: When selecting a fluid for diffusion pumps, it is essential to consider the quality of the oil to ensure optimal performance and minimal maintenance. High-quality oils help in achieving the desired vacuum levels (ranging from 10-2 to 10-10 torr) and are critical for applications such as electron-beam microscopy, vacuum deposition, and vacuum furnaces. The simplicity of operation and lack of moving parts in diffusion pumps make them durable and reliable, requiring maintenance primarily focused on maintaining the appropriate oil level and ensuring the functionality of heaters.
Chemical Compatibility and Maintenance: The choice of fluid also depends on the chemical compatibility with the vapors passing through the pump. Dry, oil-free pumps offer advantages in terms of corrosion resistance and ease of maintenance. The maintenance of diffusion pumps is straightforward, involving checks for the correct oil level and heater operation. Proper alignment of heating elements is crucial, although it can be challenging in confined spaces.
In summary, the selection of fluid in diffusion pumps is critical for achieving and maintaining high vacuum levels. Polyphenyl ether and perfluoropolyether are selected based on their specific properties that enhance the performance and longevity of the pumps, despite their higher costs compared to other options like silicone oil.
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