Various Shapes of Tungsten Filaments in Different Uses

Tungsten filament is a product of pure tungsten wire or dropped tungsten wire after finishing, with tungsten powder was main raw material, potassium, aluminum, silicon and other chemical elements as additives. Its purity is as high as 99.95%. 

According to the number of tungsten wire strands, tungsten filament can be divided into products made of single-strand tungsten wire and products made of multi-strand tungsten wire. When it is wound from a single strand of tungsten wire, the diameter of the tungsten wire is generally 0.2mm~2.0mm; when it is wound from multiple strands of tungsten wire, the diameter of the tungsten wire is generally 0.2mm~1.3mm, and the most commonly used number of strands is 2 strands and 3 strands. It should be noted that when twisted from multiple strands of tungsten wire, it is necessary to control the twisting direction and pitch of the twisted tungsten wire.

According to different shapes, tungsten filaments can be divided into many types, such as double hump type, single hump type, funnel type, coil type, straight type, door type, hook type, etc. There are also certain differences in the uses of different shapes of filaments. 

The characteristics of the filament made of tungsten metal include metallic luster, silvery white or off-white appearance, clean surface, non-radioactive, high melting point, low vapor pressure, low evaporation rate, small thermal expansion coefficient, high temperature resistance, wear resistance, impact resistance, corrosion resistance, etc.

It can be used for electric vacuum and evaporation of electronic components because it is a resistance heating body for surface metal vapor deposition, and acts as a high-temperature heating element after being energized and heated.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for more than two decades. We can supply various types of tungsten filaments as per the drawings. Please free feel to contact us if you have got any purchasing plans.

If you have any inquiry of tungsten filaments, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

Fax: +86 592 5129797

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The Latest Price of Tungsten Filaments

The latest price of φ0.8mm tungsten filaments is USD 2.00/PC, EXW XIAMEN, CHINA.

Tungsten filaments, also called cathodes or electron emitters or electron sources, are mainly made of high-quality tungsten. Of all pure metals, tungsten has the highest melting point (3422°C), the lowest vapor pressure at temperatures above 1650°C, and the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of all pure metals. This combination of properties makes tungsten an ideal material.

Tungsten can be used in both thermionic electron guns and field-emission (CFE) electron guns. Electron beams come from filaments made of various materials. The most common is the tungsten hairpin gun, which is widely used in scanning electron microscopes, transmission electron microscopes, and microprobe systems. This filament is a tungsten ring that acts as a cathode. Apply voltage to the loop to heat it up. The anode, which is positive relative to the filament, forms a strong attraction to electrons. This causes electrons to be accelerated towards the anode. Some accelerate near the anode and down the column to the sample.

An electron gun works at a high temperature, which is required for thermionic emission. For this, a filament or the cathode should be of a material that has a high melting point in order for it to continuously emit electrons. Tungsten filament is folded with various shapes to help in focusing the electron beam.

If you have any inquiry of tungsten filaments, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

Fax: +86 592 5129797

Scan QR code of Chinatungsten WeChat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

Latest Price of Tungsten Filaments on May 27, 2022

The latest price of φ0.8mm tungsten filaments is USD 2.00/PC on May 27, 2022, EXW XIAMEN, CHINA.

Tungsten filaments, also called cathodes or electron emitters or electron sources, are mainly made of high-quality tungsten. Of all pure metals, tungsten has the highest melting point (3422°C), the lowest vapor pressure at temperatures above 1650°C, and the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of all pure metals. This combination of properties makes tungsten an ideal material.

Tungsten can be used in both thermionic electron guns and field-emission (CFE) electron guns. Electron beams come from filaments made of various materials. The most common is the tungsten hairpin gun, which is widely used in scanning electron microscopes, transmission electron microscopes, and microprobe systems. This filament is a tungsten ring that acts as a cathode. Apply voltage to the loop to heat it up. The anode, which is positive relative to the filament, forms a strong attraction to electrons. This causes electrons to be accelerated towards the anode. Some accelerate near the anode and down the column to the sample.

An electron gun works at a high temperature, which is required for thermionic emission. For this, a filament or the cathode should be of a material that has a high melting point in order for it to continuously emit electrons. Tungsten filament is folded with various shapes to help in focusing the electron beam.

If you have any inquiry of tungsten filaments, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

Tungsten Filaments and Crucibles for Microprobe and Electron Beam Systems

Electron microscopes generate images by bombarding samples with electrons and then converting the results of this interaction into visual images. In order to form an image, the generated electrons need to be tightly controlled.

Electron beams come from filaments made of various materials. The most common is the tungsten hairpin gun, which is widely used in scanning electron microscopes, transmission electron microscopes, and microprobe systems. This filament is a tungsten ring that acts as a cathode. Apply voltage to the loop to heat it up. The anode, which is positive relative to the filament, forms a strong attraction to electrons. This causes electrons to be accelerated towards the anode. Some accelerate near the anode and down the column to the sample.

Tungsten wire, also known as cathode or electron emitter or electron source, is mainly made of high-quality tungsten. Of all pure metals, tungsten has the highest melting point (3422°C), the lowest vapor pressure at temperatures above 1650°C, and the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of all pure metals. This combination of properties makes tungsten an ideal material.

Since the electrons emitted in the various types of guns are heated, their energy distribution is not a spike. Instead, they have a Boltzmann distribution that can vary widely depending on the type of filament. For a good microscope, you want ΔE/E to be as small as possible. Therefore, the filament type needs to be selected according to its own applicable needs.

Chinatungsten Online/CTIA GROUP is a professional tungsten manufacturer. The high-quality filaments we offer are manufactured to OEM specifications using special tools to guarantee the correct shape of the filament and produce the best possible electron beam. We can provide tungsten filaments and crucibles for electron beam systems. 

If you have any inquiry of tungsten filaments, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.