Molybdenum crucible can be made into lidded structure and is widely used in high temperature experiments, crystal growth, semiconductor manufacturing and other fields. The following is a detailed description:
- Feasibility of molybdenum crucible with cover
Material properties support
Molybdenum (Mo) has a melting point of up to 2623°C and has excellent high-temperature strength, making it suitable for making sealing structures.
The cover and the crucible can be connected by welding, riveting or screwing to ensure sealing.
- Design points of molybdenum crucible with cover
| Design elements | Key points |
|–||
| Connection method| – Welding: Electron beam welding (EBW) or laser welding, suitable for high temperature sealing.
– Thread: Precision turned thread, requires sealing ring (such as graphite, zirconium oxide).
– Riveting: suitable for low temperature or non-vacuum environment. |
| Sealing structure | – Plane seal: The cover is flush with the crucible mouth and requires high-precision processing (Ra0.4 μm).
-Boss seal: The cover is designed with a boss that is inserted into the crucible mouth to enhance sealing. |
| Exhaust hole| – A tiny exhaust hole (0.1-0.5 mm in diameter) needs to be designed to prevent excessive pressure during heating. |
| Material Matching| – The cover and crucible must be made of the same material (pure molybdenum or molybdenum alloy) to avoid cracking due to differences in thermal expansion coefficients. |
- Application scenarios of molybdenum crucible with cover
Crystal Growth
Requirements: Sealed environment to prevent contamination by impurities and controlled atmosphere (such as vacuum, inert gas).
Typical structure: diameter 100-300 mm, height 150-400 mm, with threaded cover.
Semiconductor Manufacturing
Requirements: High vacuum environment (≤10^-6 Pa), electron beam welding sealing is required.
Typical structure: diameter 50-100 mm, height 50-150 mm, with flat sealing cover.
High temperature experiment
Requirements: Quick opening and closing for easy sampling.
Typical structure: diameter 20-50 mm, height 30-80 mm, with riveted cover.
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