Many jewelers would like to dissuade you from considering a tungsten carbide ring, because they are not educated on them (or just don't sell them!). Here are a few of the myths we hear regularly and the truths about tungsten carbide rings that make them an excellent option as you shop for a ring!
                   
Myth
Tungsten carbide rings cannot be removed in the event of an accident, and may cause your finger to be amputated.

Fact
Actually, if you're in an accident, a tungsten carbide ring is one of the safest rings to have on your hand! Because tungsten carbide rings are so dense, it is nearly impossible for them to deform or injure your finger in an accident. Wearing a tungsten carbide ring may even protect you. Rings made of silver, gold or even platinum may deform, becoming harder to get off or embedding in flesh. Hospitals have a number of ways to remove a tungsten carbide ring (depending on the accident) – none of which require amputation. Here's a video of a device American Concepts & Technologies manufactured and will soon be readily available.

The durability and near-indestructability of tungsten carbide bands is why we say that if Superman were getting married, he'd want a Tungsten Pride wedding band.

Myth
Tungsten carbide rings should not contain nickel.

Fact
In truth, tungsten carbide wedding rings are not made from pure tungsten. Pure tungsten in its natural form is an ore, and does not polish up to the shine that people love about tungsten carbide rings. Makers of tungsten carbide rings need to combine tungsten ore in a powder form with various binders and sinter it all together at very high temperatures in order to achieve the desired result – a beautiful, polished and nearly indestructible tungsten carbide ring.

A nickel binder is the preferred formulation for tungsten carbide rings, as many other binders can cause your ring to discolor with wear. Many inexpensive rings use one of these lesser binders, and aren't pleasant to wear or look at!

Myth
Tungsten rings are only for men.

Fact
This couldn't be further from the truth! The same qualities that make tungsten carbide rings so great for men make them great for women as well. The strength and beauty of tungsten carbide matches well to a woman's own strength and beauty.

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Tungsten is a hard, rare metal of critical and strategic importance. The British Geological Surveyranks tungsten among the scarcest elements on earth-rarer even than rare earths. The US Department of Energy also considers tungsten a critical material. The European Commissionidentified tungsten as the second most critical material in terms of economic importance vs. supply risk. The metal's unique properties make it essential to the manufacture of everything from drill bits to cruise missiles and there are no known substitutes.
China currently dominates the supply of tungsten and is expected to do so for the next decade. However, the Chinese government has adopted restrictive policies including implementing quota systems, increasing tax rates and pushing for industry consolidation, etc. to reorganize its tungsten industry, the same as in its rare earth industry. Chinese primary tungsten production will be curbed to half its historical growth rate going forward. Further, very few tungsten mines outside of China are expected to be in production, or close to beginning production, during the next few years.
Rising demand for tungsten coupled with dwindling supplies is keeping prices high. As a result,tungsten presents a unique situation with many opportunities for producers, fabricators and investors.

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The advantages of Gamma tungsten shielding material:
It's density is very high, the reduction in the physical dimensions of the shield assembly does not affect the validity of their rigid or shielding characteristics. Compared with traditional radiation shielding materials, gamma tungsten shielding material provides excellent value.


The high-density tungsten alloy can provide the same energy absorption of lead use 1/3 less material! Unlike lead, you can also reduce the cost of management,  it is not necessary to have a sepical permission. Tungsten alloy radiation shielding material can be widely used by reliable customers around the world.

 

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Tungsten: tungsten and various metal alloys and tungsten compounds are often used in various forms of radiation shielders. Its high density meets the  main requirements of shielding material, and is used for the shielders.The high atomic number of the tungsten is also very important. 


The tungsten can be easily processed, it is the added value.the shielding container of radioactive material is usually made ​​of metal tungsten. Radioactive material  usually by remote control in laboratories and hospitals,  it is usually installed  in the safest position of the room lined plate tungsten bricks and X-ray machine.

 

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Nano tungsten powder is fine particles of tungsten powder to the nano-level powder. The preparation of nano tungsten powder uses the nanotechnology.

What is the nanotechnology? Nanotechnology actually is the technology for a single atomic, molecular manufacturing.

There are three concepts about nanotechnology: The first is an American scientist Dr. Drexler pointed out the molecular nanotechnology in 1986. Under this concept, the combination molecules machines for practical use, and thus can combine all kinds of molecules,  and can turn out any kind of the molecular structure. This concept of nanotechnology does not make ​​significant progresses.

The second concept of nanotechnology is positioned as the limit of the micro-machining technology. That is, the "processing" of nanometer precision to manually form the structure of the technical of the nano-size. Even if the existing technology continues developing, it will eventually reach the limit. This is because, if the line width of the circuit is smaller, the enable circuit is constituted of an insulating film is extremely thin, so that  can destruct the insulation effect. In addition, there are issues such as fever and shaking. In order to solve these problems, researchers are studying a new type of nanotechnology.

A third concept is from the biological point of view. Originally, there nanoscale structure in biological cells and biofilms.
 

The nanotechnology, is to study the law of motion of electrons, atoms and molecules and characteristics of a new technology in a scale of 0.1 to 100 nm. Scientists find dozens of the number of atoms or molecules in the process of studying the material constitutions. Taking advantage of these features of manufacturing technology to make specific function devices ,this technology is known as nanotechnology.

 

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The hardness of cemented carbide is high  (86 ~ 93HRA, equivalent to 69 ~ 81HRC).And it has the advantages of  hot hardness and good wearing resistance,which the hot hardness isup to 900 to 1000 ℃, keep 60HRC.

The cutting speed of cemented carbide  tool is 4 to 7 times higher than high-speed steel and the life of  tool is 5 to 80 times higher than high-speed steel.


But the frangibility of  cemented carbide  is good, it can not be cutted and processed. It is difficult to form the complex shapes of the tools.As a result, it is often used in the production of different shapes of the blades.It can use these methods such as welding, bonding, mechanical clamping to mount on the blade bodies and the molds.

 

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The selection of carbide grade on the cemented carbide blade material is based on different addresses and different functions of the cemented carbide blade.

Cemented carbide blades have the characteristics of  high precision and high wear resistance and  has been widely used. According to the different uses of the product, cemented carbide blades can be divided into the wood cutting tools, clamping blade, milling and turning blades.

Cemented carbide  is made by the chemical vapor deposition (CVD) method,which coats TiC or TiN, HfN, Al2O3, and other wear-resistant on the surface of the carbide alloy inserts,so that the carbide alloy coating is formed. This is an important progress of modern cemented carbide  researches. The Sidek Krupp and the Swedish Sandvik company had developed TiC coated carbide inserts and put it into the market for the first time in 1969. After 1970, the United States, Japan and other countries were beginning to produce this  kind of blade. For more than thirty years, the coating technology has made great progress. Coated carbide blade has been developed from the first generation, the second generation to the third generation, fourth generation products.

                  
The advantages of cemented carbide coating:
1) coated cemented carbide  can  use the high cutting speed, thereby improving the processing efficiency;

2) since the smaller coefficient of friction between the coating material and the  processing material ,compared with uncoated blades, the cutting force of the coating blade has a certain decrease;

3) when the processing of the coating blade, the quality of processed surface  is excellent;

4) due to the good overall performance, coated blades have good versatilities. One coating grades of the blade can be widely used.

 

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The most important part of a dart is the stem, it’s where fingers hold on. The change of stems’ weight will change the shape of darts. Nowadays standard dart stem is made from tungsten alloy and this kind of dart is getting more and more popular all over the world.

There are several kinds of tungsten alloy dart stems including tungsten-nickel-copper stem, tungsten-nickel-copper-iron stem etc. If customers need special darts, they will be customized. Since there are still some barriers in manufacturing skills, tungsten dart stems with purity of 100% can not be made yet. What people can buy in the market are almost tungsten alloy stem, among which tungsten-nickel-iron alloy is the most common one.

Tungsten is a kind of material with high density and endurance. Tungsten alloy dart has small diameter compared with dart made of other materials at the same weight. For dart fans, small-size stem is very important, for it’s more comfortable to hold with fingers. The advent of tungsten alloy darts has contributed a lot to dart sports, as it has greatly improve the average scores in games.

There are some tips for dart fans:

1. When you buy a new set of darts you may notice the percentage of tungsten in the package, say, “tungsten purity 80%”, that means 80% of the material in the stem is tungsten, and the higher the purity the thinner the stem is and, of course, the more expensive the darts are. For ordinary fans 80% is good enough.

2. Remember: the only advantage of a high-purity tungsten alloy dart is that it is thinner, it does not mean it’s of high quality or fine workmanship.

3. Some people are allergic to nickel, and nickel happens to be an element of some darts stem, if those people really want to play dart, they’d better chose a substitute, like tungsten -copper darts.

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The key characteristics of CVD tungsten carbide coatings are as follows:

1、Outstanding chemical and corrosion resistance
2、Free from through porosity, thus effectively protecting mild steel substrate from corrosive media without sealing the coating
3、Superior resistance to sulfide stress cracking
4、Provides effective protection against mineral acids such as sulfuric acid and hydrochloric acid
5、Resists Aqua Regia at room temperature
6、Superior wear resistance; Wear rate of CVD tungsten carbide coatings is four fold lower when compared to thermal spray WC, 12 fold lower than hard chrome, and 40 fold lower when compared to abrasion resistant steel AR-500
7、Demonstrates better erosion rate when compared to chrome carbide weld overlay, hard chrome, white iron, cemented carbide, and various other hard materials
8、Better fatigue resistance and toughness
9、Superior resistance to impact and deformations
10、Deposition from the gas phase enables coating of internal surfaces and intricate shapes.

A micro-photograph of a cross-section of 50-microns thick CVD Tungsten Carbide coating type T on thread. The uniform coating follows the substrate; even slight imperfections are accurately followed (magnify. 20X).

Comparison results of ASTM G65 tests of CVD tungsten carbide coating abrasion resistance against other hard materials is depicted.

Results of ASTM G65 tests of CVD Tungsten Carbide coating abrasion resistance as compared to the results for other hard materials.

Corrosion resistance of CVD tungsten carbide coatings is demonstrated.

Samples of three different coatings after salt spray corrosion tests: left - HVOF after 480 hours; centre – Hard Chrome after 288 hours; right – CVD coating type T after 480 hours.
Applications of CVD Tungsten Carbide Coatings

CVD tungsten carbide coating is suitable for applications with many different components operating in extreme erosive and abrasive atmospheres, such as critical components of metal seated ball valves, downhole tools, and pumps handling abrasive fluids.

Ball valves coated with CVD tungsten carbide coating, demonstrate increased valve life thanks to the coating as it make them scratch-proof and able to resist erosion and abrasion.

Ball valves coated with CVD Tungsten Carbide coating.

CVD tungsten carbide coating extends the life and reduces downtime costs of downhole tools such as grippers for down-hole tractors, high loading bearings pins, and mud-driven hydraulic parts for directional drilling tools.

CVD tungsten carbide coating type T is applied on outside piston and inside cylinder of a positive displacement pump transporting abrasive viscous fluids at pressures as high as 2800 psi to reduce wear, thus increasing pump life threefold.

CVD tungsten carbide coating is an ideal alternative to phase-out hard chrome plating because it involves carcinogenic hexavalent chromium, thus causing negative impact on environment, health and safety.
Conclusion

With these qualities, CVD tungsten carbide coating becomes an ideal solution to improve the performance and life of critical components of valves, downhole tools, and pumps operating in power generation, cryogenic equipment, refineries, food manufacturing, and oil and gas facilities.
About Hardide Coatings

Hardide Coatings produce a range of advanced surface engineering coatings that protect the internal and external surfaces of components from wear, erosion and acidic corrosion.

The coatings are proven to extend the life of metal parts operating in harsh environments for a variety of industries including oil & gas, valves, pumps, aerospace and advanced engineering.

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