Cleaned tungsten wire is primarily used as a hot cathode filament in electron microscopes (SEM or TEM), with the following specific functions:
Electron Beam Emission: Cleaned tungsten wire emits electrons through heating (approximately 2000–2500°C), forming a high-energy electron beam for sample imaging or analysis. Its high thermal emission efficiency provides sufficient electron beam brightness, supporting high-resolution imaging (down to the nanoscale).
Durability and Stability: The high mechanical strength and low evaporation rate of cleaned tungsten wire enable long-term operation in high-vacuum environments, reducing filament replacement frequency and ensuring continuous microscope operation.
Cost-Effectiveness: Compared to other cathode materials (such as lanthanum hexaboride), cleaned tungsten wire is lower in cost, making it suitable for routine electron microscope applications while delivering reliable performance.
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