Tungsten Heater in Electron Emission
Tungsten heater is a thermionic cathode heating element used for electron emission, fabricated from high-purity tungsten wire and typically formed into spiral or coiled structures through precision bending and winding processes. It functions as a cathode or electron source component. When operated under high-vacuum or controlled atmosphere conditions, it enables stable thermionic electron emission and is widely used in vacuum electronic devices, electron microscopes, and medical imaging systems.
CTIA’s electron emission tungsten heater has the following features:
(1) Made of ≥99.95% high-purity or doped tungsten wires, suitable for high-vacuum electron emission environments.
(2) Melting point 3410°C ±20°C, ensuring structural stability under high-temperature operation.
(3) Stable thermionic emission performance for continuous electron beam output.
(4) Stable electrical resistivity for precise control of emission current and operating temperature.
(5) Low vapor pressure, reducing contamination in vacuum systems during high-temperature operation.
(6) Doped tungsten improves emission efficiency and extends service life.
(7) Can be fabricated into spiral and customized structures for different electron gun designs.
(8) Surface can be treated by chemical cleaning or electrolytic polishing to reduce outgassing and surface contamination.
Tungsten heater can continuously provide stable thermionic electron emission in high-temperature vacuum environments, making it suitable for long-term operation and high-stability application requirements. As a core component of electron emission sources, tungsten heater is widely used in:
(1) Electron gun cathodes in Scanning Electron Microscopy (SEM)
(2) Electron sources in Transmission Electron Microscopy (TEM)
(3) Cathode systems in X-ray tubes
(4) Electron sources in electron beam evaporation systems
(5) Thermionic cathodes in vacuum electronic and microwave devices
(6) Ion sources and high-vacuum electron emission systems
How does a tungsten heater work? In a high-vacuum environment, the tungsten heater is heated by applying an electric current, raising its temperature to a level sufficient to overcome the electron work function. Once a sufficient temperature is reached, electrons in the metal gain enough energy to overcome the work function barrier and are emitted from the material surface, forming an electron flow, which is known as thermionic emission. By adjusting the heating current, the electron emission intensity can be controlled to achieve stable electron beam output.
CTIA GROUP has over 30 years of experience in tungsten heater manufacturing and precision customization. Based on electron emission requirements, operating conditions, and installation space, CTIA optimizes key parameters including wire diameter, doping type and content, structure type, emission area size, heating length, and support structure. Surface treatments such as electrolytic polishing and high-cleanliness processing are also applied, enabling full-process customization from material selection, structural design to manufacturing.
For any inquiry, please contact tungsten heater manufacturer: CTIA GROUP
Email: sales@chinatungsten.com
Tel: 0086 592 5129696 / 0086 592 5129595
Website: www.tungsten.com.cn
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