Tungsten is a crucial material in furnace construction and operation.
This is primarily due to its exceptional high-temperature properties.
These properties make tungsten indispensable for various furnace applications.
Especially in vacuum and high-temperature environments.
Why is Tungsten Used in Furnaces? 5 Key Reasons Explained
1. High Melting Point
Tungsten has the highest melting point of any metal.
It melts at 3420ºC (6187ºF).
This allows it to maintain structural integrity and functionality in furnaces operating at temperatures above 1315ºC (2400ºF).
In vacuum furnaces, tungsten is used in hot zone construction.
Other materials would degrade or fail due to their lower melting points.
2. Low Vapor Pressure
Tungsten's low vapor pressure is crucial in vacuum furnace applications.
Maintaining a clean, non-reactive environment is essential.
In metal injection molding (MIM) furnaces, tungsten heating elements prevent the release of contaminants like oxygen, carbon, or moisture.
This ensures the purity of the heating environment.
3. Shape Retention
Tungsten can retain its shape at high temperatures.
This makes it ideal for furnace components that must withstand extreme heat without deformation.
Applications include welding electrodes and support structures in high-temperature furnaces.
Tungsten's shape retention also enables its use in ultra-high-temperature diamond coating processes.
Tungsten wires transmit heat uniformly in vapor deposition coating furnaces.
4. High Hot Strength
Tungsten offers high hot strength.
This means it maintains its strength at high temperatures.
This property is beneficial for various furnace applications.
From supporting structures to heating elements.
5. Other Beneficial Properties
Tungsten also has low thermal expansion.
It has high thermal conductivity.
It offers high corrosion resistance.
It has good electrical conductivity.
These properties further enhance its suitability for various furnace applications.
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