Black tungsten wire exhibits excellent thermal conductivity, particularly maintaining stable performance in high-temperature environments. Although surface treatments may have a minor impact, its overall thermal conductivity remains significantly better than that of most metals and alloys.
Inherent Thermal Conductivity of Tungsten
- High Thermal Conductivity: Pure tungsten has a thermal conductivity of approximately 173 W/(m·K) at 20°C, which is relatively high among metals, about half that of copper (401 W/(m·K)) but far exceeding iron (80 W/(m·K)) and stainless steel (15–25 W/(m·K)).
- Temperature Dependence: Tungsten’s thermal conductivity decreases with increasing temperature. For example, at high temperatures (e.g., ~2500°C, the operating temperature of incandescent lamps), the thermal conductivity may drop to around 100 W/(m·K), yet it still maintains good heat transfer capability.
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