Molybdenum crucible has a very high melting point (about 3410 ° C), excellent thermal shock resistance, good chemical stability and low vapor pressure characteristics, are widely used in the smelting process of various high melting point metals, especially suitable for metallurgical processes that require high temperature and high purity environment.
The following are the main types of metals suitable for melting in molybdenum crucibles and their reasons:
- Precious metals
Platinum (Pt)
Rhodium (Rh)
Iridium (Ir)
Palladium (Pd)
These metals have high melting points, strong chemical stability, and are expensive, and the smelting process requires extremely high purity. Molybdenum crucibles do not react with them and are ideal smelting containers.
- High melting point refractory metals
Tungsten (W): melting point about 3422 ° C, molybdenum can be used as an auxiliary container for tungsten smelting, especially in tungsten alloy smelting.
Tantalum (Ta): melting point about 3017 ° C, molybdenum crucible has strong chemical inertness and is suitable for use under vacuum or protective atmosphere.
Niobium (Nb): Molybdenum crucible can effectively avoid its oxidation in an inert gas environment.
Zirconium (Zr) and Hafnium (Hf): Commonly used in nuclear industry and aviation, they have high melting points, are easily oxidized, and are suitable for smelting in molybdenum crucibles.
Titanium (Ti): Molybdenum crucible is suitable for melting titanium and titanium alloys under vacuum or inert atmosphere.
- Rare Earth Metals
Neodymium (Nd)
Dysprosium (Dy)
Cerium (Ce)
Gadolinium (Gd)
Samarium (Sm)
Rare earth metals have a high melting point and are sensitive to impurities. Molybdenum crucibles can provide a clean, stable, high-temperature smelting environment, which is very suitable for the smelting, refining, distillation and other processes of rare earth metals and their alloys.
- Alloy material
Ultra-high temperature alloys (such as tungsten-molybdenum alloys, titanium-aluminum alloys, etc.)
Magnetic alloys (such as rare earth iron alloys)
Memory alloys (such as NiTi alloys)
Molybdenum crucibles can withstand the extremely high temperatures required to melt these alloys and have advantages in controlling the introduction of impurities.
- Semiconductor metals and optoelectronic materials
Germanium (Ge)
Silicon (Si)
Gallium Arsenide (GaAs)
Indium (In), antimony (Sb), etc.
These materials are often used in semiconductor crystal growth, evaporation, vapor deposition and other processes. Molybdenum crucibles are often used as heating containers in their molten or reactive atmospheres, and are particularly suitable for CZ (direct pulling) method to grow single crystals.
- Molybdenum alloy self smelting
Mo-Re (Molybdenum-Rhenium Alloy)
Mo-Ti (Molybdenum Titanium Alloy)
Molybdenum crucibles can also be used for melting their own alloy systems, such as in the production of high-temperature structural materials or electronic tube components.
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