The higher the purity of black tungsten wire, the better its mechanical strength, high-temperature stability, electrical performance, and corrosion resistance, making it suitable for demanding applications. Lower-purity tungsten wire is less costly but has inferior performance, suitable for scenarios with less stringent performance requirements. The choice depends on balancing application conditions (e.g., temperature, atmosphere) and cost.
Mechanical Performance:
- High Purity: Tungsten wire with high purity (e.g., 99.95% or higher) has a more uniform crystal structure, reducing grain boundary defects caused by impurities. This results in superior tensile strength and ductility, making it ideal for high-temperature, high-stress environments (e.g., lamp filaments or electrodes).
- Low Purity: Impurities (e.g., oxygen, nitrogen, carbon, or metallic elements like iron or nickel) weaken the mechanical strength of the wire, increasing brittleness and susceptibility to fracture, particularly at high temperatures.
High-Temperature Performance:
- High Purity: High-purity tungsten wire is more resistant to grain growth and recrystallization at high temperatures (e.g., above 2000°C in incandescent lamps or vacuum furnaces), maintaining structural stability and extending service life.
- Low Purity: Impurities may volatilize or react with tungsten at high temperatures, forming bubbles or compounds that degrade the wire’s surface or performance.
Electrical Performance:
- High Purity: High-purity tungsten wire offers more stable resistivity and predictable conductivity, making it suitable for use as electrodes or heating elements.
- Low Purity: Impurities increase resistivity variability, potentially causing localized overheating or unstable electrical performance.
Corrosion Resistance:
- High Purity: High-purity tungsten wire exhibits stronger resistance to oxidation and chemical corrosion, especially in vacuum or inert gas environments.
- Low Purity: Impurities may react with oxygen or other chemicals in the environment, accelerating the aging of the wire.
Processing Performance:
- High Purity: High-purity tungsten wire is easier to process during drawing or forming, resulting in better surface quality and suitability for precision applications.
- Low Purity: Impurities may cause cracks or surface defects during processing, compromising the quality of the finished wire.
More details of tungsten wire, please visit website: http://www.tungsten-wire.com.cn/
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