In order to preserve reserve barium tungsten cathodes, the following basic principles need to be noted:
Isolate the atmosphere
Due to the easy absorption of moisture and other impurities by the BaO component in barium salts, it is required not to be exposed to the atmosphere for more than 48 hours before use. The key is to prevent moisture, dust, and other pollutants from coming into contact with the product to the greatest extent possible.
Vacuum or inert gas preservation
To ensure optimal performance, it is best to store the electrode at ≤ 0.1Pa or in a dry inert gas, such as dry nitrogen or argon.
Avoid moisture absorption
When the electrode absorbs too much moisture, spots may appear on the surface of the product during the heating process before subsequent use. This situation can be reduced or prevented by reducing the heating speed.
Keep the environment clean and dry
All electrode operations should be carried out in a very clean and dry environment. Oil or other contamination on the fingers can affect the activation of the electrodes and the performance of the final lamp.
Pay attention to temperature
The usage temperature of barium tungsten cathode is relatively wide, but when used under high temperature conditions, the emission current of the electrode is large but the lifespan is short; When used under lower temperature conditions, the emission current is smaller but the lifespan is longer. Therefore, when storing, it is also necessary to pay attention to the ambient temperature to avoid high or low temperatures affecting the performance of the electrodes.
During production and use, barium tungsten cathodes have the characteristic of easily absorbing water vapor and carbon dioxide in the air and becoming ineffective, so it is strictly prohibited to be exposed to air for more than 24 hours. China Tungsten Intelligent Manufacturing Technology Co., Ltd. suggests that customers seal a certain amount of products in quartz glass tubes after receiving them (heating to 1200 ℃ and vacuuming for 60 minutes before sealing). The number of seals per tube should ideally match the production demand of the day, and it is advisable to use them immediately.
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