The latest price of φ0.76x3x50mm tungsten filament coil is USD 0.60/PC on February 20, 2024, 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 φ3.20x175mm 2% yttrium tungsten electrode is USD 1.80/PC on February 20, 2024, 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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The latest price of 1KG gold plated tungsten bar is USD480.00/PC on February 20, 2024, EXW XIAMEN, CHINA.

What Is Tungsten Gold Plated Bar?

Tungsten gold plated bar is not the real gold. It is made of tungsten alloy bar inner and coated with coated with a layer of gold on its surface. It turns to be alike the gold color after the gold plating process, but the price for tungsten gold is much cheaper than the real gold.

As its high density almost the same to that for the real gold, it can be used as gold substitution for gifts and souvenirs. Besides, tungsten alloy bar, brick, coin without gold plating usually has a natural surface with its unique metallic luster, which is clear and textured. This kind of tungsten gold plated products becomes more and more popular among the youths. The main advantages of tungsten gold plated are high-density, wearing resistant and corrosion resistant.

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The latest price of 97%W Ø7.93x52mm tungsten alloy dart billet is USD4.20/PC on February 20, 2024, EXW XIAMEN, CHINA.

What Are Tungsten Dart Billets?

Tungsten is used in dart production because of its high weight to volume ratio. The higher percentage of tungsten used to make a dart which is the slimmer and sleeker. Tungsten dart billets are the rods used for making dart barrels. The standard material for barrel is tungsten heavy alloy, and barrel forms the main part of a dart (mainly used in sports).

Advantages of Tungsten Dart Billets?

Tungsten alloy has many special properties, such as small size with high density, high melting point, high hardness, excellent wear resistance, high ultimate tensile strength, good extension, heat resistant, good thermal stability, easy processing, corrosion resistance, good shock resistance, high radiation absorption capacity, excellent impact and crack resistance.

Regular Sizes of Tungsten Dart Billets?

The weights of billets are varied from different tungsten contents and rod sizes. Popularly 70~90% tungsten dart billets are used for making both soft-tip and steel tip tungsten barrels, ranging from 14~18 gram and 18~40 gram respectively, and sometimes, 65% and 95~97% tungsten are offered following customers’ specific request.

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The latest price of 28.4G tungsten putty for pinewood derby cars is USD2.60/PC on February 20, 2024, EXW XIAMEN, CHINA.

What is Tungsten Putty?

Tungsten putty is a non-hardening, moldable material made from tungsten powder and a polymer binder. Under normal conditions, it will not harden. The density of tungsten putty is similar to that of lead, but can be adjusted accordingly, for example, 7.0g/cm3, 8.5-9.5g/cm3 or even higher.

What Is Tungsten Putty Used for?

Tungsten Putty can be easily used for fine-tuning the weight of pinewood derby cars. Simply pinch off a piece of the putty, knead it until it is pliable, and press the putty into a cavity or hole in the car. If the car is too heavy, use a small screwdriver to remove some of the tungsten putty. In addition, it can be used by anglers to pin their end tackle to the lake bed when fishing. A small amount of putty moulded on your hook length and swivel can help aid in complete concealment of your rig and help prevent spooking of the wariest of carp.

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The latest price of WC50Cu50 5x100x100mm tungsten carbide copper plate is USD64.30/PC on February 20, 2024, EXW XIAMEN, CHINA.

What is Tungsten Copper Alloy?

Tungsten-copper alloys are pseudo-alloys of copper and the refractory metal tungsten. Since copper and tungsten are immiscible, the material consists of different particles of one metal dispersed in a matrix of another metal. As a result, the microstructure is a metal matrix composite rather than a true alloy.

Characteristics of Tungsten Copper Alloy

It combines the properties of two metals to form a material that is heat, ablation resistant, highly thermally and electrically conductive, and easy to process. It is also resistant to arc corrosion, mechanical wear and contact welding. Parts are made from tungsten copper alloy by pressing tungsten particles into the desired shape, sintering the compacted part, and finally infiltrating it with molten copper.

Tungsten Copper Alloy Grades

Common grades of this alloy contain 5% copper to 50% copper with tungsten in balance. The typical properties of an alloy depend on its composition. Alloys with less copper have higher density, higher hardness, and higher resistivity. Typical densities are 17.3 g/cm3 for WCu10 alloy and 12.2 g/cm3 for WCu50 alloy. WCu10 alloy has higher hardness and resistivity than WCu50 alloy of 260 HB kgf/mm2 and 6.5 µΩ.cm.

Tungsten Copper Alloy Applications

Tungsten copper products are meeting the increasing demands of high-tech applications, such as major electronic equipment, safety equipment, aviation and power generation, etc. Sheets and plates made from copper-tungsten alloys are used in many industries, including aerospace and power generation. Heat exchanger and cooler elements in electronic equipment as well as passive heat sinks, arches and vacuum contactors in high current equipment are made of this alloy.

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The tungsten alloy counterweight crankshaft is used to balance the rotational inertia force and moment generated by the connecting rod big end, connecting rod journal and crank, so that the engine crankshaft runs smoothly. Some counterweight crankshafts are made integrally with the crankshaft, which is an extension of the crankshaft, and some are separately made parts, which are fixed on the crank with bolts.

Tungsten alloy has the advantages of small size, high density, high hardness, high wear resistance, strong corrosion resistance, strong impact resistance, high melting point, high temperature resistance, environmental protection, etc. Tungsten alloy is definitely a suitable crankshaft material.

Usually tungsten alloy parts are often used as counterweights for machines, boats, airplanes, yachts, spaceships, and other places that require small size and heavy weight. Tungsten alloys are widely used in high-performance engines (cars, racing cars, motorcycles, trucks) , yachts, etc.).

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Chinatungsten Online can customize the grade and size of tungsten alloy sheet for various uses, the most regular grade is 90%wnicu.

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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 syringe shield 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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