Black Tungsten Wire

Black tungsten wire refers to tungsten wire that has not undergone chemical cleaning or electrolytic treatment and retains a surface oxide layer formed during processing. The surface appears dark gray or black due to oxidation during wire drawing and intermediate annealing processes. CTIA delivers application-driven selection and matching solutions supported by advanced process control and extensive engineering expertise.

1. Properties of Black Tungsten Wire
The performance of black tungsten wire is derived from tungsten’s inherent high-temperature stability and low evaporation rate. It exhibits good thermal stability and dimensional retention in the temperature range of approximately 1500–3000℃. At 2000℃, its vapor pressure is around the 10⁻⁵ Pa level, making it suitable for high-temperature vacuum or inert atmosphere environments. At room temperature, the resistivity is approximately 5.6×10⁻⁸ Ω·m and changes stably with temperature, enabling its use as a resistive heating material. At high temperatures, it maintains high thermal strength and creep resistance, with creep behavior remaining controllable above 2000℃.

2. Specifications of Black Tungsten Wire
The diameter range of black tungsten wire is typically φ0.02 mm–φ3.0 mm:

2.1 φ0.02–0.1 mm: used for fine heating elements and auxiliary structures.
2.2 φ0.1–1.0 mm: used for heating elements and supporting structures.
2.3 above φ1.0 mm: used for high-temperature load-bearing or structural components.

3. Applications of Black Tungsten Wire
Black tungsten wire is mainly used in high-temperature environments where heating and structural functions are required:

3.1 Heating Elements
Used as a resistive heating material, generating heat through the Joule effect under electrical current in vacuum or inert atmosphere furnaces.

3.2 High-Temperature Support Structures
Used as support wires or fixing components in high-temperature environments, maintaining structural stability through high melting point and creep resistance.

3.3 Evaporation Coating Auxiliary Structures
Used as supporting or holding components for evaporation sources, maintaining shape stability under high vacuum conditions of approximately 10⁻³–10⁻⁵ Pa and at high temperatures.

3.4 General Industrial High-Temperature Applications
Used in various high-temperature equipment as functional or auxiliary components where high surface cleanliness is not required, enabling stable operation.

The performance of black tungsten wire is closely related to surface condition and intrinsic material properties. For sourcing decisions, CTIA recommends focusing on operating temperature, current load, and service atmosphere, as well as diameter tolerance and batch consistency, since these factors directly affect heating efficiency and service life.

For any inquiry, please contact tungsten wire manufacturer: CTIA GROUP

Email: sales@chinatungsten.com

Tel: 0086 592 5129696 / 0086 592 5129595

Website: www.tungsten.com.cn

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