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 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 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.

 

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