Certain production steps require a vacuum or inert gas (e.g., hydrogen) environment, as detailed below:
- Sintering: Performed under vacuum or hydrogen protection to prevent oxidation of the tungsten blank.
- Swaging and Drawing: Some high-temperature processing is conducted in a hydrogen atmosphere to prevent surface oxidation.
- Annealing: Typically carried out in a vacuum or hydrogen furnace to avoid contamination by impurities such as oxygen and nitrogen.
- Surface Treatment: Electrolytic polishing or chemical cleaning may be performed in a vacuum or inert environment.
A vacuum environment can reduce oxidation and improve tungsten wire purity and surface quality, but it is not required for all steps; hydrogen protection is more commonly used.
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