Extremely High Melting Point
Tungsten (W): 3422°C (the highest among all metals)
Molybdenum (Mo): 2623°C
Application Scenarios: This is the core advantage. When evaporation coils need to operate in extremely high-temperature environments, or when the refrigerant itself is an ultra-high-temperature medium (e.g., in certain concentrated solar power systems, deep geothermal development, or systems used to cool ultra-high-temperature fluids in special chemical processes), copper (1083°C) and aluminum (660°C) will melt, while tungsten and molybdenum can maintain structural integrity.
High-Temperature Strength and Creep Resistance
At high temperatures, copper and aluminum soften drastically and their strength becomes extremely low. However, tungsten and molybdenum can still retain high strength and the ability to resist deformation (creep resistance) even at temperatures of 1000°C or higher. This is crucial for the safety of high-pressure systems.
Low Thermal Expansion Coefficient
The thermal expansion coefficients of tungsten and molybdenum are much smaller than those of copper and aluminum. This means that when subjected to drastic temperature changes, their dimensional changes are minimal, which can reduce thermal stress and improve the reliability and service life of the system.
Excellent Corrosion Resistance
Molybdenum, in particular, is renowned for its outstanding ability to resist corrosion by various acids, molten metals, and glass. If the refrigeration process involves extremely corrosive chemicals or media (e.g., in certain specialized chemical or metallurgical industries), molybdenum evaporation coils may be a viable option.
Using tungsten or molybdenum to manufacture evaporation coils is a choice for extremely specialized and exceptional applications. Potential application scenarios include:
Aerospace and Hypersonic Vehicles: Used to cool equipment or structures under extreme aerodynamic heating, requiring materials that can still operate at ultra-high temperatures.
Nuclear Fusion Experimental Devices (e.g., Tokamaks): The cooling systems for first-wall components or divertors may need to withstand extremely high thermal loads and particle bombardment. Tungsten, due to its high melting point and low sputtering rate, is used as a plasma-facing material, and the internal cooling channels may involve extreme operating conditions.
Specialized Chemical and Metallurgical Industries: Process links that require handling high-temperature, high-pressure, and highly corrosive media.
Cutting-Edge Scientific Research: Certain scientific experimental devices that require refrigeration in high-temperature environments.
English