Molybdenum crucibles can be heated at atmospheric pressure, but the temperature must be strictly limited and the environmental conditions must be controlled.
- Feasibility analysis of heating molybdenum crucible under normal pressure
Material properties
molybdenum is 2623℃. When heated to below 1800℃ under normal pressure, the molybdenum crucible can work stably without melting or structural failure.
High temperature oxidation risk: Molybdenum begins to react with oxygen above 400°C to generate volatile MoO₃, which causes the crucible to fail due to oxidation.
- Temperature Limitation
the molybdenum crucible under normal pressure, the temperature should be strictly controlled below 1800℃ to avoid accelerated oxidation.
Relationship between temperature and oxidation rate: For every 100°C increase in temperature, the oxidation rate increases by about 10 times.
Environmental Control
Inert atmosphere: Heating under vacuum or inert gas (such as argon) protection can effectively inhibit oxidation.
Reducing atmosphere: Hydrogen or carbon monoxide can be used to reduce the generated oxide layer, but the gas purity needs to be strictly monitored.
- Typical applications of atmospheric pressure heating molybdenum crucible
Metal evaporation
Used to evaporate high-purity metals (such as gold and silver), the temperature is controlled at 1500-1800℃ and must be carried out under the protection of inert gas.
Alloy Melting
For melting low melting point alloys (such as copper-based alloys), the temperature does not exceed 1200°C and can be operated for a short time in an air environment.
Ceramic sintering
Used for sintering ceramic materials such as zirconia, the temperature should be controlled below 1500℃, and chemical reaction with molybdenum should be avoided.
- Key Recommendations
the molybdenum crucible under normal pressure, the temperature must be strictly limited to below 1800°C, otherwise the risk of oxidation will increase dramatically.
Atmosphere protection: vacuum or inert gas protection is preferred to avoid oxidation and metal contamination.
Regular inspection: After heating, the crucible needs to be inspected for oxidation degree and size changes to ensure safety.
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