Molybdenum crucibles must focus on preventing oxidation, contamination and mechanical damage. The following are specific precautions:
- Environmental Control
Anti-oxidation
Humidity requirement: The storage environment humidity must be lower than 50% to prevent the molybdenum surface from absorbing moisture and oxidizing to form MoO₃ (molybdenum oxide).
Gas environment: It is recommended to fill with high-purity nitrogen (purity ≥ 99.999%) or argon to form an inert gas protective layer.
Sealing measures: Use vacuum packaging or sealed containers to reduce contact with oxygen.
Anti-pollution
Cleanliness: The storage area must meet ISO 8 (10,000) or higher cleanliness standards to prevent dust, metal particles and other impurities from adhering.
Anti-corrosion: Keep away from corrosive substances such as acid, alkali, salt, etc. to prevent the crucible surface from being corroded.
- Packaging and stacking
Packaging Materials
The inner layer uses polyethylene (PE) or polytetrafluoroethylene (PTFE) film, and the outer layer uses an anti-static aluminum foil bag to prevent static electricity from absorbing dust.
A desiccant (such as silica gel) can be placed in the package to absorb residual moisture.
Stacking method
Independent storage: Crucibles should be separated by soft materials (such as polyurethane foam) to avoid collision.
Fixed support: Use wooden or plastic trays to prevent the crucible from deforming due to stacking pressure.
Maximum number of stacking layers: no more than 3 layers, and the weight of a single layer does not exceed 50kg.
- Transportation and protection
Handling tools
Use anti-static nylon straps or a vacuum suction cup to avoid direct contact with the crucible surface.
Do not allow metal tools (such as forklift teeth) to directly touch the crucible.
Operation Specifications
Wear clean gloves when handling to avoid contamination from hand grease.
Handle the crucible with care to prevent it from cracking or deforming due to impact.
- Storage Condition Parameters
Parameter requirements
Temperature 15℃-30℃ (avoid high temperature which may accelerate oxidation)
Humidity ≤ 50%RH
sunlight to prevent ultraviolet rays from accelerating aging
pressure (if vacuum packaging is required, the pressure should be ≤ 100Pa)
- Storage period and inspection
Storage period
Unopened molybdenum crucibles can be stored for more than 12 months under recommended conditions.
After opening, use within 6 months or reseal the package.
Regular inspection
Appearance inspection: Check every 3 months to confirm there are no oxidation spots, cracks or deformations.
Dimension inspection: Inspect key dimensions such as inner diameter and height once a year to ensure that the tolerance is within ± 0.1mm.
- Precautions for special scenarios
Long-term storage
The desiccant needs to be replaced regularly, and it is recommended to be replaced every 6 months.
Perform air tightness test every 12 months to ensure packaging integrity.
Transportation and storage
Shockproof packaging must be used during transportation to avoid severe vibration.
The transport vehicle must maintain a constant temperature (15℃-25℃) to avoid sudden temperature changes.
- Problem Solving
Surface oxidation
Minor oxidation can be removed by lightly sanding with fine sandpaper (600 grit or above).
Severe oxidation requires return to the factory for pickling or high-temperature reduction treatment.
Pollution treatment
Organic pollution can be wiped with ethanol or acetone, and metal pollution needs to be treated with a special cleaning agent.
- Storage taboos
It is forbidden to coexist with carbon-containing materials such as graphite and silicon carbide: carbonization reaction may occur at high temperature to generate Mo ₂ C (molybdenum carbide).
Avoid contact with sulfur-containing substances: Sulfides will react with molybdenum to form MoS₂ (molybdenum sulfide), which will reduce the performance of the material.
Do not stack on wet ground: Use wooden or plastic pallets for overhead storage.
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