The latest price of φ0.8mm Joel tungsten filament is USD 2.00/PC on Dec. 9, 2022, EXW XIAMEN, CHINA.

What is Tungsten Filaments?

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.

Why Tungsten Filaments Are Used in Electron Gun?

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.

Why Are Tungsten Filaments in the Electron Gun Folded?

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.

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The latest price of φ2.4x175mm yttrium tungsten electrode is USD 1.10/PC on Dec. 9, 2022, EXW XIAMEN, CHINA.

What is Yttrium Tungsten Electrode?

Yttrium is a lanthanide metal found in most rare earth minerals, especially yttrium tantalite. It can be used as the yttrium phosphor to produce the red color on television screens and monitors and used as a superconductor and as a component of X-ray filters and superalloys. When added to tungsten as a rare earth element, it can be used as a welding electrode.

Among the non-consumable electrodes, the yttrium tungsten electrode is the most consistent, so it is often used to weld steel structures and non-ferrous alloys such as carbon steel, low alloy steel, copper, titanium, stainless steel, etc. under direct current/DC. This type of electrode arc beam is slender and has a large degree of compression, and its penetration is the largest in medium and large currents. Thanks to these characteristics, it is especially popular in the military industry and aerospace industry.

Yttrium tungsten welding electrode contains 1.8-2.2% yttrium oxide, and the electron escape work is 2.8-3.2ev. They are marked WY-20 (navy blue) according to international marking. Among the components of the WY20 electrode, there are silicon, molybdenum, manganese, sulfur, carbon, and phosphorus. When the impact hardness is 100 J/cm2, the surfacing coefficient is 9.5 h/Ah. One of the characteristics of domestic electrodes is the need for short arc processing and pre-baking. The last is done in a dedicated furnace for an hour.

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Chinatungsten Online Tungsten Alloy Card Conventional Specifications:

1. Width × Length: (2.0-500.0mm) × (2.0-500.0mm)

2. Thickness: 0.2mm-5.0mm

3. Density: 15.8-18.75 g/cm3

4. Composition: Tungsten content: 85-99%, tungsten-nickel-iron, tungsten-nickel-copper

5. Surface: sintered state, polished surface, polished surface

Tungsten alloy cards are widely used in radiation shielding materials, and can also be used to make bank cards, door cards, business cards, dog tags, etc., which are both decent and delicate and can be preserved forever.

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Tungsten alloy ring is generally used in industrial counterweights, or shields for medical devices. The thickness of the ring can be as thin as 2mm, but because it is too thin, it is prone to cracking during processing, so the rejection rate is high. The thinner the wall thickness, the higher the price.

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Tungsten alloy medical shielding can be used for collimators, nuclear radiation shields, ray blockers, PET syringe shields, protective canisters, radioisotope containers, DNA (FDG) containers, multi-leaf collimators, etc. .

The advantages of tungsten alloy materials:

1.High radiation mask absorption capacity

2.Under the same radiation mask performance, the tungsten alloy mask is thinner than the lead material

3.Non-toxic, environmentally friendly materials

4.Good machinability

5.Hard and wear-resistant, no need for coating protection

6.Easy to disinfect and sterilize

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Tungsten alloy military cube has excellent properties of high density and high strength, and is an ideal material for military products. The commonly used content is 93%~97% WNIFE, and trace elements are added to improve its crushability, tensile strength and bending strength. . In addition, tungsten alloy is non-toxic and non-polluting, and tungsten alloy military squares are widely used in military fields such as fragmentation rings.

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Tungsten alloy swaging rod is made of tungsten alloy rods by swaging. Common methods used in processing include extrusion, forging and sintering. After swaging, tungsten alloy swaging rods have higher elongation, hardness and tensile strength than tungsten alloy rods. Tungsten alloy swaging rods have a longer service life. Tungsten alloy swaging rods are widely used in the military field and can be used as rifle bullets, armor-piercing bullets, and anti-material sniper rifle bullets.

Advantages of tungsten alloy swaging rod: low cost, easy to use, simple processing, good wear resistance, high hardness (40HRC, the strength of tungsten alloy rod is between 26HRC and 30HRC), high tensile strength (1200MPa~1400MPa).

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Tungsten alloy rod has many excellent characteristics such as high density, high melting point, small size, extremely high wear resistance, high hardness, high tensile strength, high elongation, high temperature resistance, etc. It is widely used in industrial fields such as aerospace Counterweights, medical masks and processed parts such as molds and welding rods.

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The density of tungsten alloy plate is between 16.9 and 18.1g/cm3, which means that tungsten alloy is the heaviest metal material. Tungsten alloy has excellent radiation shielding ability, electrical conductivity, thermal conductivity, corrosion resistance and mechanical properties. The tungsten alloy sheet provided by Chinatungsten Online has a tungsten content of 85-97%, and the size can be customized according to customer requirements. It has the advantages of high density, good elongation, durability and long service life.

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The composition of tungsten alloy tube is composed of tungsten-nickel-iron, tungsten-nickel-copper and tungsten-nickel-copper-iron. Some tungsten alloy tubes also contain metal elements such as cobalt, molybdenum, and chromium. Tungsten alloy tube has large specific gravity and small volume, and can be used in the fields that require parts with small volume and large specific gravity. For example, it can be used as golf ball counterweight, fishing sinker, military counterweight, shotgun bullets, prefabricated fragments, missile warheads, armor-piercing projectiles, and oil drilling platform counterweights. Tungsten alloy tubes can also be used for mobile phone vibrators, balance parts of pendulum clocks and automatic watches, shock-proof tool holders, flywheel counterweights, etc.

For more information about tungsten alloy products, please visit: http://www.tungsten-alloy.com