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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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 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.

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.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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Email: sales@chinatungsten.com
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