Molybdenum crucibles can be used for sulfide or oxide material processing, especially under high temperature, vacuum or specific atmosphere conditions, they are stable and can meet the purity and process requirements of material preparation. The following is a specific analysis:
- Application of molybdenum crucible in sulfide material processing
High temperature stability
molybdenum crucible is as high as 2610℃, and it can work stably in high temperature environment above 2000℃. It is suitable for melting, crystallization or synthesis reaction of sulfide materials (such as ZnS, CdS).
Chemical inertness
In an inert gas (such as Ar, N₂) or vacuum environment, molybdenum crucibles are not prone to chemical reactions with sulfides, thus avoiding the introduction of impurities and ensuring material purity.
Application Cases
Sulfide crystal growth: Molybdenum crucibles are used to grow ZnS crystals by physical vapor transport (PVT), providing a high temperature and stable environment.
Powder Metallurgy: During the sintering or hot pressing of sulfide powders, molybdenum crucibles can withstand high temperatures and pressures to ensure material densification.
- Application of molybdenum crucible in oxide material processing
Oxidation resistance
In an oxidizing atmosphere, molybdenum crucibles can form a dense MoO ₂ or MoO ₃ layer through surface oxidation to slow down further oxidation and are suitable for melting or sintering of oxide materials (such as Al ₂ O ₃ and Y ₂ O ₃).
High purity requirements
molybdenum crucibles make them ideal for the preparation of high-purity oxide materials, such as sapphire single crystal growth (Al ₂ O ₃).
Application Cases
Oxide crystal growth: Molybdenum crucibles are used for guided-die growth EFG) of Y₂O₃ crystals, providing uniform temperature field and chemical stability.
Ceramic material preparation: During the sintering process of alumina ceramics, molybdenum crucibles can withstand high temperatures and reduce material contamination.
III. Potential Challenges and Solutions
Oxidation Problem
Challenge: Long-term use in an oxidizing atmosphere may cause oxidation loss of the molybdenum crucible.
Solution: Use coating technology (such as Mo₂C, ZrO₂) or optimize process parameters (such as temperature, atmosphere) to delay oxidation.
Heat stress
Challenge: Thermal expansion at high temperatures can cause molybdenum crucibles to crack.
Solution: Reduce thermal stress by optimizing crucible design (e.g. wall thickness, shape) and adopting preheating process.
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