The hardness range of black tungsten wire is approximately 350-450 HV (Vickers hardness) or 7.0-7.5 (Mohs hardness), with specific values influenced by grain structure and doping elements. Its high hardness ensures wear resistance and mechanical strength, making it suitable for filament and high-temperature component applications.
Hardness Range:
- The hardness of black tungsten wire is typically expressed in Vickers hardness (HV) or Mohs hardness:
- Vickers Hardness (HV): Approximately 350-450 HV (specific values depend on the purity of the tungsten, doping elements, and processing techniques).
- Mohs Hardness: Approximately 7.0-7.5 (typical Mohs hardness for tungsten).
- The hardness range may vary slightly depending on the wire-drawing process, grain size, or doping elements (e.g., potassium, aluminum, silicon).
Influencing Factors:
- Grain Structure: The wire-drawing process creates elongated grains in black tungsten wire, increasing hardness but maintaining some brittleness at room temperature.
- Doping Elements: Trace doping (e.g., potassium) may slightly enhance hardness through grain boundary strengthening.
- Processing State: Black tungsten wire is unpolished, and its surface roughness may indirectly affect hardness test results.
Characteristics:
- The high hardness of black tungsten wire makes it wear-resistant, suitable for high-temperature and mechanically stressful environments.
- At room temperature, it exhibits high hardness but is brittle, with improved ductility at high temperatures (>1000°C).
More details of tungsten wire, please visit website: http://www.tungsten-wire.com.cn/
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