Molybdenum crucible can withstand high-power current heating. This feature is mainly due to the high melting point, high strength and good conductivity of molybdenum metal, as shown below:
- High melting point and high temperature resistance
Melting point up to 2610℃: Molybdenum crucible can work stably in high temperature environment above 2000℃, which is much higher than traditional metal materials and is suitable for high-power current heating scenarios.
Excellent high temperature strength: It can maintain mechanical strength at high temperatures and avoid deformation or cracking due to thermal stress.
- High conductivity
Low resistivity: Molybdenum has good electrical conductivity and can conduct current efficiently, reducing energy loss.
Rapid heating: High conductivity enables the molybdenum crucible to heat up quickly when current passes through it, meeting the needs of rapid heating.
- Thermal shock resistance
Low thermal expansion coefficient: The thermal expansion coefficient of molybdenum is only 1/3~1/2 of that of steel, which is similar to SiO₂, reducing the risk of cracking caused by drastic temperature changes.
Strong creep resistance: Under high temperature and high pressure, the molybdenum crucible can maintain a stable shape and is not prone to plastic deformation.
- Chemical stability
Inert materials: Molybdenum crucibles do not easily react with molten metals or chemical reagents, avoiding contamination of samples or affecting experimental results.
Corrosion resistance: It has good resistance to corrosive media such as acids and alkalis at high temperatures.
- Practical application scenarios
Vacuum coating: In a vacuum environment, the molybdenum crucible is heated by electric current to melt the material and achieve thin film deposition.
Single crystal growth furnace: As the core heating container, it withstands high-power current heating to ensure the stability of single crystal growth.
Rare earth smelting: In a high temperature and unprotected atmosphere, the molybdenum crucible is heated by electric current to melt rare earth metals.
- Notes
Molybdenum is easily oxidized to form MoO₃ at high temperatures and needs to be used under vacuum or inert gas protection.
Current control: The current intensity needs to be precisely controlled to avoid local overheating that may cause material loss or crucible damage.
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