Types of JEOL’s EB Tungsten Filament

What Is JEOL’s EB Tungsten Filament？

Evaporation source materials used for vapor deposition require excellent electrical conductivity, high melting point and low vapor pressure. Therefore, many vapor deposition accessories are made of tungsten. Filaments/heaters made of tungsten have the characteristics of high melting point, low thermal expansion coefficient, good corrosion resistance and long evaporation life. Japan Electron Optical Laboratory is the full name of JEOL. After decades of exploration and research by the world's top scientific instrument manufacturers, they created this brand. And now their products are widely used in the fields of medicine, biology, biochemistry, agriculture, material science, metallurgy, chemical industry, petroleum, pharmaceutical, semiconductor and electronics. Their filaments are well known in the world and widely used in many files. 

Their filaments have a powerful vacuum system and is widely used in SEM (Scanning Electron Microscope). These filaments use the latest optoelectronic systems to improve image quality in scanning electron microscopes. 

The types of EB Tungsten Filament

They include 0.55mm of mosquito type, 0.65mm of mosquito type, 0.8mm of mosquito type, 0.8mm of eccentric type and 0.55mm of half-moon type. These filaments have strong plasticity in maintaining electron gun and optical coating.

1, Mosquito Coil: the shape of the filament is similar to the mosquito coil, therefore, it can be named as Mosquito Coil. And the Mosquito Coil can be divided into many specifications.

2, Pull-type: Pull-type is also known as the cavity type of Mosquito Coil.

3, U-shaped: this kind of filament is similar to the shape of the letter U.

4, U-shaped with folding legs: the feet of the filament has a curved.

5, Half Moon: the shape of this type is the shape of a half moon.

6, Straight shape

Our company is professional manufacturer of tungsten for more than two decades. EB Filaments especially JOEL types are available. Please feel free to contact us for more information. 

If you have any inquiry of molybdenum filament, 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

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The Latest Price of Cerium Tungsten Electrode

The latest price of φ3.2x175mm cerium tungsten electrode is USD 2.00/PC, EXW XIAMEN, CHINA.

Cerium tungsten electrode (WC20) is alloyed with about 2% cerium oxide. It is a non-radioactive, refractory or non-consumable metal electrode material, which is the preferred substitute for thorium tungsten electrodes. Regular diameter of the electrode is between 0.5mm and 12.0mm, and the length is 150mm and 175mm.

The addition of this small percentage of cerium oxide increases the electron emission qualities of the electrode which gives them a better starting characteristic and a higher current carrying capacity with no spitting. With the increase of cerium oxide content, the ablation resistance and arc starting of cerium tungsten electrode will increase; with the increase of use time, the welding performance will gradually decrease.

The electrode has excellent arc starting properties at low current, and can operate successfully with AC or DC electrode negative. If used on higher current applications, the cerium oxide may be concentrated to the excessively hot tip of the electrode. In addition, WC20 is also used in inert gas shielded arc welding, hydrogen atom welding, argon arc surfacing, pulse argon arc welding, plasma welding, plasma cutting, plasma spraying, plasma melting, etc. The welding materials can be carbon steel, stainless steel, silicon copper, copper, bronze, titanium and so on.

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

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What Are Differences of Tungsten Copper Foils, Sheets and Blocks

What do you know about tungsten copper foils, strips, sheets, plates, or blocks? What are their differences?  

Actually, they are the same product with rectangular shape. To distinguish them, people often call them differently. Foils usually mean plates with thickness less than 0.1mm; strips mean thin and narrow plates; sheets mean plates with 0.1-2.0mm thickness; plates mean 2.0-10.0mm thickness and thickness above 10.0mm will be called blocks. 

Tungsten copper alloy is a refractory metal alloy of tungsten and copper which is made from copper powder and tungsten powder. WCu alloy Parts are made from the WCu alloy by pressing the tungsten particles into a desired shape, sintering the compacted part, then infiltrating with molten copper. Therefore, the alloy combines the properties of both metals, resulting in a material that is heat-resistant, ablation-resistant, highly thermally and electrically conductive, and easy to machine.

If you are looking for a material that has high density, high thermal conductivity or low thermal expansions, the WCu Alloy would be the best choice. Its versatility, durability and cost-effective performances make it very popular in many industries. 

Nowadays, tungsten copper products are a staple in the refractory metal industry and are meeting the growing demands of high-tech applications such as major electronics, safety equipment, weighted gaskets, EDM electrodes in spark erosion cutting machines, heat sinks, arc contacts and vacuum contacts, and other electrical and electrical/thermal applications. 

Chinatungsten provides these industries with the best quality sheets, strips, plates and blocks products to meet all specifications of functional performance, precise dimensions, finish and packaging to meet the exact requirements of buyers. We work closely with our customers' design engineering and production personnel to meet all end-use and manufacturing needs. Do feel free to contact us if you have any purchasing plans. 

If you have any inquiry of tungsten copper sheets, 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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How Does Tungsten Filament or Tungsten Cathode Work?

Tungsten filament, also named tungsten heater, tungsten filament coil or tungsten cathode, is made of tungsten material and formed by single tungsten wire or multiple strands according to the specific requirements of the available samples or drawings. 

As a typical representative of refractory metal tungsten products, its tungsten content is generally more than 99.95%, and the diameter is in the range of 0.2-2.5mm. With characteristics of high melting point, high specific gravity, high strength, high hardness, high resistivity, low vapor pressure, low evaporation rate, small thermal expansion coefficient, high temperature resistance, wear resistance, impact resistance, corrosion resistance and good electrical and thermal conductivity, tungsten filaments are widely used in many fields. 

Generally, they are often used as evaporation source materials for vacuum evaporation machines, and are mainly used in the production of computers, picture tubes, mirrors, plastics, car lights, mobile phone casings, precision optics, craft glass, cosmetic packaging and photovoltaic products.

The advantages of using tungsten heaters in vacuum evaporation machines include high utilization of tungsten resources and good coating effect, that is, the film products have the advantages of high precision, uniformity and stability, mainly due to the high melting point of the heaters, good Corrosion resistance and oxidation resistance.

A cathode is the metallic electrode through which current flows out in a polarized electrical device. In many applications, since the cathode gains electrons to produce current, it gradually gains mass from the cations it attracts. When used as a cathode, uses can easily gain current and the service life is longer than other materials. 

Tungsten stranded wire or tungsten wire is mainly used as the raw material of heater, and can also be directly used for heating element of semiconductor or vacuum device. The metal wire to be evaporated and the tungsten wire can also be twisted together to make the product more convenient and faster.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum. If you request a quote for above products, please feel free to contact us. 

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

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Tungsten Sheet Price on July 26, 2022

Φ100x0.3mm tungsten sheet price is 4.60 USD/PC on July 26, 2022, EXW XIAMEN, CHINA. 

Tungsten sheets can be as thin as 0.01mm or as thick as 127mm, with widths typically ranging from 10mm to 800mm. They can be used in many different applications and is valued for its corrosion resistance, ability to withstand extremely high temperatures, and ability to create rigidity and hardness when combined with other metals in the alloy.

Tungsten is used in the aerospace, research, building materials and light bulb industries. It is the predominant metal in electric furnace heating elements, as well as in any assembly where high pressure/high temperature environments are expected. Sheets made of tungsten are commonly used in furnace construction, but are also important for making parts for the electronics and semiconductor industries, and can be found in a variety of lighting, vacuum plating, electronic vacuums and shielding.

If you have any inquiry of tungsten sheet, please feel free to contact us:

Email: sales@chinatungsten.com/sales@xiamentungsten.com

Tel.: +86 592 5129696/+86 592 5129595

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Lanthanated Tungsten Electrode Price on July 26, 2022

Ø3.2x175mm lanthanated tungsten electrode price is 1.90 USD/PC on July 26, 2022, EXW XIAMEN, CHINA. 

Wl20 electrodes contain at least 1.7% to 2.2% lanthanum for excellent arc starting, low burnout rate, good arc stability and excellent re-ignition characteristics. They are ideal if you want to optimize your welding capabilities. They can work well on either AC or DC electrode negatives with tips, or they can be used with AC sine wave power supplies. The tungsten electrode adding with rare earth element lanthanum holds sharp tips well, which is an advantage for welding steel and stainless steel on DC or AC from square wave power sources.

If you have any inquiry of lanthanated tungsten electrode, please feel free to contact us:

Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

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