The thermal conductivity of tungsten wire does change at different temperatures. The following is a detailed analysis of the change of thermal conductivity of tungsten wire with temperature:
- Basic definition of thermal conductivity
Thermal conductivity is the ability of a material to conduct heat. It indicates the amount of heat transferred through a unit area of the material in a unit time when the temperature gradient is 1℃/m, in units of W/(m·K). For metals such as tungsten, its thermal conductivity is usually high.
- Relationship between thermal conductivity and temperature of tungsten wire
Thermal conductivity at room temperature: At room temperature, the thermal conductivity of tungsten is about 173W/(m·K). This value shows that tungsten has good heat conduction ability at room temperature.
Changes in thermal conductivity at high temperature: The thermal conductivity of tungsten wire usually changes with increasing temperature. However, unlike some other materials, tungsten can still maintain relatively high thermal conductivity at high temperatures. However, it should be noted that high temperature may cause changes in the internal microstructure of tungsten wire, such as lattice distortion, grain boundary migration, etc., which may have a certain impact on thermal conductivity.
Experimental observation results: Experimental data show that the thermal conductivity of tungsten may decrease slightly under high temperature and high pressure conditions. This may be due to the enhanced electron scattering of tungsten wire at high temperature, resulting in a decrease in heat conduction efficiency. But in general, tungsten wire can still maintain a high level of thermal conductivity at high temperatures.
- Other factors affecting the thermal conductivity of tungsten wire
In addition to temperature, the thermal conductivity of tungsten wire may also be affected by other factors, such as material purity, microstructure, surface treatment, and test conditions. For example, high-purity tungsten wire usually has higher thermal conductivity; and a layer of oxide protective film may be formed on the surface of specially treated tungsten wire, which may affect the heat conduction efficiency.
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