Using molybdenum crucibles, due to their high temperature applications and susceptibility to oxidation, special attention must be paid to the following safety matters to ensure safe operation and extend the service life of the crucible:
- Safety protection during high temperature operation
Wear high temperature resistant gloves: When operating molybdenum crucibles, especially in high temperature environments, high temperature resistant gloves must be worn to prevent burns.
the molybdenum crucible directly with your hands. Use high-temperature pliers, clamps and other tools to move the crucible.
Wear flame resistant clothing: Wear appropriate flame-resistant clothing and protective equipment when working, especially in environments with high temperatures or molten metal.
- Avoid sudden temperature changes
Molybdenum crucibles are susceptible to thermal shock at high temperatures. When operating, avoid placing them directly from a high-temperature environment to a low-temperature environment, or suddenly placing a cold crucible into a high-temperature furnace.
The preheating process should be slow and even, avoiding rapid heating or cooling.
- Oxidative protection
Avoid exposure to oxygen: Molybdenum easily reacts with oxygen at high temperatures to form molybdenum oxide (MoO₃), which not only damages the crucible surface but also affects its strength. Molybdenum crucibles should be avoided from being exposed to oxidizing atmospheres, especially at high temperatures.
Use an inert gas atmosphere such as argon or operate in a vacuum environment to avoid oxidation.
- Operating Environment
Check the furnace and atmosphere control system: ensure that the operating environment (such as atmosphere furnace, vacuum furnace, etc.) is stable, prevent atmosphere leakage or temperature fluctuations, and avoid unnecessary damage to the molybdenum crucible.
Good ventilation system: Ensure good ventilation in the working environment, especially during high temperature operations, to avoid the impact of high temperature gases on personnel health.
- Regular inspection and maintenance
the molybdenum crucible regularly, especially whether there are cracks, oxidation, damage, etc. Clean or replace the damaged crucible in time to avoid damage extension or affect the experimental results.
During the use of molybdenum crucible, if there is too much oxide layer or wear on the surface, its strength and thermal conductivity may decrease.
- Use appropriate filling materials
If welding or repairing is required, choose appropriate filler materials. Commonly used filler materials include molybdenum alloy or tantalum alloy to ensure its chemical stability and high temperature resistance.
- Avoid contact with toxic substances
Prevent contact with corrosive gases: In some special applications, such as chemical reactions, avoid contact between molybdenum crucibles and corrosive gases such as chlorine and fluorine to prevent corrosion.
- Storage and handling
Proper storage: When not in use, molybdenum crucibles should be stored in a dry, dust-free place and avoid direct contact with moisture or chemicals in the air.
Avoid collision and friction: Avoid collision or friction of the crucible during transportation to prevent surface damage or cracking. Use special handling tools to ensure the safety of the molybdenum crucible.
- Proper cleaning methods
using the molybdenum crucible, it should be thoroughly cleaned to remove grease, dirt or other contaminants that may be attached to the surface. Avoid using cleaning agents containing corrosive chemicals when cleaning.
After cleaning, you can use ultrasonic cleaning or a clean brush to clean it to ensure a smooth surface finish.
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