Molybdenum crucibles have the characteristics of high temperature resistance, corrosion resistance, and chemical inertness in chemical laboratories and are often used in the following scenarios:
- High temperature melting and sintering
Metal/alloy melting
Application: Melting high melting point metals (such as tungsten, molybdenum, tantalum) and alloys (such as tungsten copper alloy).
Advantages: The melting point of molybdenum crucible is as high as 2610℃, and it can withstand high temperature above 2000℃ to avoid the introduction of impurities.
Example: When melting tungsten, the molybdenum crucible can work stably under the protection of hydrogen to avoid carbonization or oxidation.
Sintering of ceramic materials
Application: Sintering high temperature ceramic materials such as boron nitride (BN) and silicon carbide (SiC).
Advantages: The chemical inertness of molybdenum crucibles avoids reaction with ceramic materials and ensures product purity.
- High temperature treatment of samples
Sample ashing and decomposition
Uses: In analytical chemistry, it is used for high-temperature ashing of samples (such as organic matter and biological samples).
Advantages: Molybdenum crucibles are stable at high temperatures and avoid sample loss or contamination.
Example: When analyzing the heavy metal content in soil or food, molybdenum crucibles can be used to ashed samples to ensure the accuracy of the analysis results.
Volatile element collection
Uses: To collect volatile elements (such as arsenic and selenium) at high temperatures.
Advantages: Molybdenum crucibles can withstand high temperatures without releasing impurities, avoiding contamination of the collected elements.
- Special chemical reaction vessels
High temperature corrosive reaction
Application: To react in strong acid, strong base or molten salt environment.
Advantages: The chemical inertness of the molybdenum crucible avoids reaction with reactants, ensuring experimental safety.
Molybdenum crucibles provide stable operation when processing samples in molten sodium hydroxide (NaOH).
High temperature atmosphere controlled reaction
Uses: Reactions are carried out in vacuum, inert gas (such as Ar) or reducing atmosphere (such as H₂) .
Advantages: Molybdenum crucibles can withstand high temperature oxidizing or reducing environments to avoid material loss.
Example: When melting metals in a hydrogen atmosphere, molybdenum crucibles can avoid hydrogen embrittlement and ensure experimental safety.
- Crystal Growth and Material Preparation
Single crystal growth
Application: As thermal field components of single crystal growth furnaces for sapphire, silicon carbide, etc.
Advantages: The low thermal expansion coefficient of molybdenum crucible (5.5×10 ⁻⁶ / ℃) reduces thermal stress and avoids crystal cracking.
Chemical Vapor Deposition (CVD)
Application: As a reaction vessel of CVD equipment, it is used to deposit thin film materials such as nitride and carbide.
Advantages: The chemical inertness of the molybdenum crucible prevents reaction with the reaction gas and ensures the purity of the film.
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