Tungsten Metal
Tungsten metal is a chemical element; it has symbol W and atomic number 74. Tungsten is a rare metal found naturally on Earth almost exclusively as compounds with other elements. It was identified as a new element in 1781 and first isolated as a metal in 1783.
1. Tungsten metal lowest coefficient of thermal expansion among pure metals provides stability under extreme heat, making it essential for tools like tungsten-carbide cutting tools and jet-engine turbine blades.
2. Tiny kinetic munitions and racing car ballast are two examples of applications in which tungsten metal shines. Its density is around 1.7 times higher than lead and 19.3 times higher than water.
3. Due to its conductive properties and inertness, tungsten metal is widely used in electronics and high-radiation environments. It serves as a key source for X-ray targets and finds applications in electrodes, conductors, and metallic films.
4. Due to its great corrosion resistance, tungsten metal can be exposed to corrosive materials including solvents, water, and acid for extended periods. Its resilience increases its applicability in maritime settings, including: jewelry, fishing lures, and shipbuilding.
5. Tungsten metal boasts the highest melting point among pure metals (3,422 °C), making it crucial for applications in high-temperature environments, particularly in aerospace and construction.
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Tungsten Metal VS Stainless Steel
|
Item |
Tungsten Steel |
Stainless Steel |
|
Chemical Composition |
Steel, C, W, etc. |
Fe, Cr, Ni, and other elements |
|
Properties |
High hardness, thermal stability, and heat resistance. |
Excellent corrosion, heat, and high-temperature resistance. |
|
Advantages |
It has excellent cutting performance and wear resistance, making it suitable for processing hard materials. It also has good thermal stability, allowing it to maintain high hardness at elevated temperatures. |
Remains rust-free even with prolonged use in acidic or alkaline environments. |
|
Disadvantages |
It has higher manufacturing costs and is difficult to process. |
It has relatively lower strength and is prone to plastic deformation. |
|
Applications |
Aerospace, military, industrial medical, etc. |
Construction, food processing, medical devices, chemicals, etc. |
What Are the Applications of Tungsten Metal?
Electronics
Tungsten metal is essential to electronics as an interconnecting material for integrated circuits. Tungsten metal is prominent for its elevated electrical conductivity and resilience. This guarantees effective signal transfer among diverse constituents in electronic apparatuses, hence augmenting their dependable functionality and bolstering the complex interconnectivity indispensable for contemporary technologies.
Alloys
It is common practice to combine tungsten metal with refractory metals to create alloys with qualities appropriate for a variety of uses, such as turbine blades and rocket-engine nozzles, as well as fine darts.
Fusion Power
In fusion power, tungsten metal surpasses carbon for plasma-facing materials (PFM) in upcoming nuclear reactors. Its exceptional high-temperature strength, minimal erosion, efficient thermal conductivity, low tritium retention, and relatively low activation under neutron irradiation make tungsten the preferred choice for ensuring the viability and safety of future fusion reactors.
Permanent Magnets
Applications for tungsten metal include improving the magnetic characteristics of SmFeN–α-Fe permanent magnet nanocomposites. Tungsten is added in the 0–17% range to modify the microstructure and magnetic behavior. This is accomplished by mechanically alloying Sm, Fe, and W powders, then annealing and nitriding the mixture. As a result, permanent magnets operate and perform better.
Medical Applications
Tungsten alloys are integral in diverse medical applications, offering strength and protection. They serve in gamma radiography, oncology instruments, and as containers for radioactive sources. Additionally, tungsten-alloy syringe shields provide a robust defense against radiation exposure, ensuring safety and efficacy in medical procedures.
Nanowires
Tungsten oxide nanowires, composed of tungsten and oxygen atoms, demonstrate excellent electrical conductivity and unique optical properties, finding applications in sensing, electronics, optoelectronics, and energy storage.
Military Materials
Tungsten metal, prized for its high hardness and temperature resistance, is used in military applications such as: tungsten-alloy bullets, shrapnel heads, and armor-piercing projectiles.
Chemical Applications
In the chemical industry, tungsten compounds are essential because they help produce a wide range of materials. These compounds take advantage of the special qualities of tungsten to influence the formulation of a wide range of chemical products necessary in diverse industrial applications, from pigments and paints to catalysts, inks, and lubricants.
Tungsten metal was first discovered in 1783 through charcoal reduction of the oxide found in wolframite. It has been used for centuries in various forms as part of the manufacture of porcelain for making pottery. In many countries, it is referred to as wolfram instead of tungsten. The term tungsten comes from Swedish meaning "heavy stone". Wolframite is from the German words "wolf rahm" meaning "wolf cream".
Tungsten metal is used as a base and alloying element with the alloy tungsten carbide being its most common form. Scheelite and wolframite are two important tungsten minerals. The initial modern use of tungsten was as light bulb filament material, which is still popular today.
Tungsten carbide is a compound that contains equal parts of tungsten atoms and carbide atoms. It is a gray powder that is compressed and shaped through sintering for use in equipment, cutting tools, abrasives, armor piercing shells, and jewelry. As with tungsten, tungsten carbide has a high melting temperature of 5200°F or 2870°C with a boiling point of 10830°F or 6000°C.
The two types of tungsten carbide compounds are tungsten carbide(WC) and tungsten semicarbazide (W2C). Additionally, two other categories of tungsten carbide are a-WC and ß-WC with a-WC having a hexagonal form and ß-WC having a cubic high temperature form.
Tungsten Carbide
Tungsten carbide is a combination of tungsten and carbon at a 1 to 1 ratio. It is a fine gray powder that is processed into other forms and useful materials. Tungsten carbide is an extremely strong alloy that is capable of enduring exposure to chemicals like acids, alkalis, and the effects of oxygen and water. It has twice the strength of high-grade steel and is denser than titanium or steel. There are over 20 grades of tungsten carbide powder, which vary according to their grain size, tensile strength, hardness and melting points.
The manufacturing of tungsten carbide includes sintering and pressing tungsten carbide powder into strong and durable products, tools, and parts. Due to its high strength, tungsten carbide is very useful in the mining industry, construction sites, and metalworking. Statistically 60% of all tungsten carbide alloys are made solely for these industries.
Cemented Carbide
This is one of the most common alloys of tungsten. It is a tungsten carbide alloy alloyed further with cobalt which is used as a binder which forms the cement. Cobalt strengthens tungsten and counteracts its tendency of being brittle under high pressure and thereby allowing it to be used in critical structural applications.
Alloyed Tungsten
Alloyed tungsten is a general term that refers to the various alloys made by mixing tungsten with different types of metals. Common examples are copper and iron alloys. The various alloys are useful in both industrial and commercial applications. Tungsten nickel iron is an example of the alloys of tungsten. Nickel adds density, improves strength and improves ductility of the new metal alloy. Tungsten nickel copper is another viable alloy of tungsten that has some unique abilities. The presence of copper in an alloy substantially makes the new alloy non-magnetic. This therefore creates a very strong metal that has no magnetic properties. It is very important for oncology systems and tasks where shielding of electrical sensors is key.
Pure Tungsten
In its purest form, tungsten is an extremely good electrical conductor and is primarily used in electrical applications. In electronics, pure tungsten is used as a connecting medium for components on a circuit panel.
How Tungsten Metal is Isolated and Refined
If you've ever been curious as to how your lovely (or extremely masculine and rugged) tungsten metal carbide came to be, you would find that there is much more to the process than ordering your ring from your reputable tungsten jeweler. Digging in to the tungsten carbide ring can be a very eye opening and confusing process that begins with, well, digging.
Once the tungsten metal ore that was extracted from the earth is ready for processing and has been prepared. The process in preparing the tungsten is the same as has been used since it was initially extracted by the Spanish brothers and chemists Juan Jose and Fausto d'Elhuyar y de Suvisa. However, unlike the method used by the d'Elhuvar y de Suvisa brothers, modern extraction and preparation requires an extra, complicated step. Today, a complex chemical extraction is produced during the process. The chemical is called ammonium paratungstate, or more commonly known as APT.
APT is produced in two different ways. The methods are acid leaching and autoclave-soda. Ore is mixed with sodium carbonate under high temperatures and pressure in the autoclave-soda process. APT crystals are formed after ammonia is added to sodium tungstate solution.
In the acid leaching process, tungsten metal ore is broken down using hydrochloric acid making solid tungstic acid and calcium chloride. Ammonia is used as in the autoclave-soda process. Ammonia is used to dissolve tungstic acid. After evaporating and filtering the mixture, crystals of APT are produced.
Now, you may be wondering what crystals have to do with the tungsten carbide rings you purchased at your local or online retailer. Well, the process is still yet to be completed. The next part of the process is to make tungsten oxide.
The APT crystals are heated in a rotary furnace in order to form one of the three types of oxides that are formed. In this process, hydrogen is blown over the crystals. During this process, there are essentially three zones of differing levels of extreme heat. In the zone with the highest heat, hydrogen converts ammonia in the APT into hydrogen and nitrogen. Eventually, tungsten powder is produced by reducing the oxide in a furnace. After the tungsten powder is formed, it can be made into solid metal through a process known as sintering.
There is a lot of science and years of discovery that go into isolating the tungsten metal. While it is a laborious process, the end result creates much, much more than simply tungsten rings and other fine jewelry.
Properties of Tungsten Metal
Tungsten Metal Chemical Properties
Tungsten metal is located in the transitional group of the chemistry periodic table and has oxidation states of + 2, + 3, + 4, + 5, and + 6. It has an atomic number of 74 and a relative atomic mass of 183.84. Tungsten metal is a solid at room temperatures because of a stable isometric crystal formation which can be seen under an x-ray.
Tungsten metal is very resistant to corrosion by acids and is only vulnerable to nitric acid and hydrofluoric acid. Also, it can be weakened by alkaline oxidizing melts like potassium nitrate or sodium hydroxide. Tungsten metal is very resistant to corrosion but will combine with oxygen readily at very high temperatures to produce trioxides.
Naturally, the metal is a mixture of 5 stable isotopes namely tungsten-180, tungsten-182, tungsten-183, tungsten-184, and tungsten-186 which have a percentage composition of 0.12%, 26.5%, 14.3%, 30.6% and 28.4% respectively.
Tungsten Metal Physical Properties
Tungsten metal in its purest form is a shiny white metal that can easily be processed. It does however contain traces of oxygen and carbon within its chemical composition and this makes it very brittle when put under tremendous stress and force.
It also has a very low thermal expansion coefficient of 4.4×10-6mm°C which is about the same as that of borosilicate glass and this is why it is used for glass metal seals.Tungsten is also environmentally friendly and does not decompose or breakdown easily.
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