Tungsten wire needs to be carefully maintained during use to ensure its stable performance and extend its service life. Here are some key maintenance steps and precautions:
- Keep the surface of the tungsten wire clean and dry
Regular cleaning: Regularly remove impurities on the surface of the tungsten wire, such as dust, grease, etc., to prevent these substances from corroding the tungsten wire or affecting its performance at high temperatures.
Keep it dry: Make sure the tungsten wire is in a dry environment and avoid it from getting wet or coming into contact with water vapor, as moisture may cause the tungsten wire to oxidize or accelerate aging.
- Adjust the working environment to reduce oxidation
Control the gas environment: Increase the concentration of hydrogen in the working area while reducing the concentration of oxygen, or use inert gases (such as nitrogen or argon) instead of oxygen to reduce the risk of tungsten wire oxidation.
Use a protective agent: Apply a layer of tungsten wire protective agent on the surface of the tungsten wire to form a protective film to prevent oxidation. The protective agent usually contains elements such as silicon, calcium, potassium, and magnesium, which can form a hard protective layer under high temperature and high pressure.
- Optimize the working conditions of the tungsten wire
Adjust the current and voltage: Make sure the tungsten wire works at the appropriate current and voltage to avoid overheating or accelerated aging of the tungsten wire due to excessive current or voltage.
Monitor saturation: In applications such as scanning electron microscopes, frequently observe the saturation of the tungsten filament and manually adjust the filament current to maintain its saturation state.
- Pay attention to the details of installation and replacement
Correct installation: When installing the tungsten filament, ensure that it is well centered to avoid performance degradation due to deflection or misalignment.
Use gaskets: In scanning electron microscopes, gaskets of appropriate thickness can be selected to increase the height of the tungsten filament and reduce the filament saturation current, thereby extending the life of the tungsten filament.
- Perform regular maintenance and inspections
Regular inspections: Regularly check the status of the tungsten filament, including its surface condition, degree of wear, etc., so as to detect and deal with problems in a timely manner.
Replacement cycle: According to the usage and working conditions, formulate a reasonable tungsten filament replacement cycle to ensure that the tungsten filament is always in the best working condition.
- Other maintenance measures
Dehumidification and degassing: For newly replaced tungsten filaments, dehumidification and degassing should be carried out to remove the air and water vapor adsorbed on its surface to avoid corrosion to the vacuum degree of the lens barrel and the tungsten filament.
Maintain high vacuum: In applications such as scanning electron microscopes, maintain high vacuum in the lens barrel and always pay attention to whether there is a slight leak to ensure that the tungsten filament works in the best environment.
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