The crystal structure of black tungsten wire is body-centered cubic (BCC), which provides high strength and high-temperature stability. Trace doping elements have minimal impact on the structure, primarily optimizing performance.
Crystal Structure: Tungsten has a body-centered cubic (BCC, Body-Centered Cubic) crystal structure at room temperature.
Characteristics:
- In the BCC structure, each unit cell has one tungsten atom at the center and eight tungsten atoms at the corners of the cube.
- This structure imparts high strength, high hardness, and excellent high-temperature stability to tungsten, though it also makes it relatively brittle at room temperature.
- The lattice constant is approximately 3.165 Å (angstroms, at room temperature).
Doping Effects: Black tungsten wire may be doped with trace elements (e.g., potassium, aluminum, silicon), which may alter grain size or distribution but do not change the fundamental BCC crystal structure. Doping primarily enhances high-temperature creep resistance and ductility.
High-Temperature Stability: The BCC structure remains stable at high temperatures (even close to the melting point of 3422°C), making black tungsten wire suitable for high-temperature applications such as filaments or heating elements.
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