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Diffusion pump oil can “crack” due to several reasons:
1. Overheating: If the pump operates above the recommended temperature, the oil can decompose, leading to the formation of carbon and other compounds that can deteriorate the oil’s performance.
2. Contamination: The presence of foreign substances such as moisture, air, or other gases can react with the pump oil at high temperatures and cause cracking.
3. Pump Overload: If the pump is exposed to a higher gas load than it is designed to handle, it can lead to increased temperatures and oil degradation.
4. Improper Oil: Using an oil that is not designed for the specific pump or operating conditions can also lead to cracking due to unsuitable thermal or chemical properties.
5. Extended Use: Over time and with prolonged use, diffusion pump oil can break down chemically and lose its ability to perform effectively.
Regular maintenance, using the correct type of oil, and operating the pump within the recommended temperature and load specifications can help prevent oil cracking.