Tungsten Carbide Rod Extrusion Binder

Due to the large amount of tungsten carbide rod extrusion binder is used in the tungsten carbide rod extrusion process, the types of tungsten carbide rod extrusion binder has a great relation with the extrusion temperature, time and extrusion parameter. If the improper binder is being used, it may cause the defective tungsten carbide rod. The binder should have strong liquidity which the viscosity is small and stable under certain extrusion temperature. After it cools down, it should be strengthened and has small molecular weight. The binder should have high adhesion and no chemical reaction with carbide powder. It should also be environmental protection, low cost, stable, no volatility, high thermal conductivity, corrosion free, long service life, etc. If the improper tungsten carbide rod extrusion binder is used, it may cause the tungsten carbide rod deformed, affects its density, stability and property. 


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Tungsten powder not only widely used in the carbide producing, but also is the main raw material for tungsten-based alloy. In order to improve the material performance so that it can produce more excellent performance products, refined powder will be a trend to improve material performance.  Violet tungsten oxide surface cracks is rich, and is composed of loose needle or rod-like particles which making violet tungsten oxide has good air permeability. On one hand it is good for hydrogen reaction start with particle surface as well particles interior, thereby increasing the nucleation rate reduction. On the other hand, it is conducive to discharge water vapor which produces at the reduction process, to avoid form tungsten oxide hydrate --WO2 (OH) 2. WO2 (OH) 2 can cause chemical vapor transport leading to the tungsten powder particle size enlargement.

Tungsten powder particle size is influenced by the amount of loading the boat and hydrogen flow significantly smaller which is produced by violet tungsten oxide. Thus, when suing violet tungsten powder producing refine tungsten powder can be appropriate to increase its installed capacity boat, which reflects its advantages in productivity. And violet tungsten oxide has single phase composition so the tungsten powder particle size which is obtained from violet is small and uniform, narrow particle size distribution, the more important is unstructured gathering clumps.

So violet tungsten oxide compared to other tungsten oxide is more suitable for the producing refine tungsten powder. violet tungsten oxide at a temperature of 650 ~ 800 ℃ for 3 hours to produce refine tungsten powder the average particle size is only 0.08um, and tungsten powder is relatively uniform and well dispersed.

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Tungsten Carbide Rod Test

Tungsten carbide rod is of high wear resistance, high strength, high corrosive resistance, high hardness and high density. Tungsten carbide rod usage mainly includes drill, end mill and drift. It can also be applied in cutting, stamping and measuring machines. It is widely used in papermaking, packing, printing and non ferrous metal processing. It is also used for processing high speed steel tool, carbide milling tool, carbide cutting tool, carbide drills, electronic cutting tool, step drill, metal cutting saw, the barrel of guns, carbide rotary burrs, etc. Nowadays tungsten carbide rod mainly uses manual test, it requires more time, man power and financial resources, and the test result is unstable and inaccurate. The marketing requirement for the tungsten carbide rod amount is increasing, so the test technology for tungsten carbide rod is facing adverse conditions. In order to solve this problem, many manufactures are searching for the automatic machines to promote the accuracy and stability of test results.


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Blue tungsten oxide as an important raw material for the producing tungsten powder, its performance has been more attention. The people attention switch to microstructure of blue tungsten oxide from macroscopic properties. The main indicators of bule tungsten oxide performance not only the physical properties such as the impurity content, particle size, liquidity, specific surface area., the microstructure of tungsten blue also have some influence on the performance of blue tungsten oxide.

By scanning electron microscopy to observe the surface morphology of blue tungsten oxide powder, it found blue tungsten oxide polymerization by lots of particle and there are many irregular cracks on the powder. Using HRTEM observed that many gaps between the grains of blue tungsten oxide, so blue tungsten oxide particles are porous. These cracks and voids in favor of accelerating the reaction rare of blue tungsten oxide hydrogen reaction and excluding water. Blue tungsten powder was found by TEM which it has cubic crystal blue tungsten oxide, as well as needles purple tungsten oxide grain. We can see in the blue tungsten powder not only including blue tungsten oxide particle as well as some component of violet tungsten oxide, and this phenomenon is present in most blue tungsten. This shows that in the producing technology of blue tungsten oxide need more improve.

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Tungsten sputtering target is made of tungsten powder. Tungsten sputtering target owns three types: flat-target type, arc-target type and rotary target type.

Tungsten sputtering target can be applied in glass coating, or high temperature resistance, wear resistance, corrosion-resistant in high-grade decorative items and other industries.

Tungsten sputtering target in decorative coating applications:

With the improvement of people's living standards, more and more people carry out the requirements of the Commodity color decorative coating to beautify these objects and increase its wear resistance, high temperature resistance, corrosion resistance and other properties.

Decorative coating refers to: surface coating on watches, mobile phones, rings, bracelets, necklaces, earrings, glasses and other products.

Commonly used decorative coating materials are: tungsten, titanium, nickel, stainless steel, aluminum and so on.

 

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Tungsten sputtering target is made of tungsten powder. Tungsten sputtering target owns three types: flat-target type, arc-target type and rotary target type.

Tungsten sputtering target application:

Tungsten sputtering target can be applied in glass coating, or high temperature resistance, wear resistance, corrosion-resistant in high-grade decorative items and other industries.

Tungsten sputtering target is widely used in the electronic information industry, such as, solar cells, semiconductors, Information memory, electronic control equipment and integrated circuits and so on.

In recent years, electronic information and other high-tech industries are developing rapidly in China and around the world. Therefore, tungsten sputtering target demand is also increasing every year, which brings new opportunities and challenges for the survival and development of China's target manufacturing industry.

 

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Functionally graded cemented carbide tools refers to a different location on the cross section of cemented carbide cutting tools, and its chemical composition was regularly and uneven distribution. Gradient of its components can be given different properties in different parts of carbide cutting toolsm which is in favor of cemented carbide cutting tools solve their own problems in contradiction hardness and toughness, making it achieve excellent overall performance.

Functionally graded cemented carbide cutting tools can be used in very harsh working conditions in foreign countries, .related products have been put into production use. In China, the researches of functionally graded cemented carbide cutting tools are more than ten years, but the key core technology and equipment has not been completely broken through, it will remain the focus of future research.

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Tungsten recycle in tungsten carbide cutting tools at home and abroad has three main methods: melting method,mechanical crushing, electrolysis, melting method also includes saltpeter and zinc melting method, introduced here tungsten carbide cutting tools zinc melting method.

Principleof tungsten carbide cutting tools zinc melting method is that zinc and cobalt in tungsten carbide cutting tools form zinc-cobalt alloy, cobalt matrix cause swelling immersion, and then vacuum distilled zinc, the tungsten carbide cutting tools become porous body and then milled to obtain crushed tungsten carbide - cobalt mixed powder.

Advantages of c tungsten carbide cutting tools zinc melting method are short process, low cost, high efficiency and low energy consumption, the disadvantage is that it requires special equipment and technology.

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Tungsten recycle in tungsten carbide cutting tools is very important.On the one hand, China's tungsten resources for sustainable development mandate of extremely arduous.China has large reserves of tungsten resources in general, but black tungsten mining based pattern has not been fundamentally changed, wolframite reserves fall too fast. According to the existing exploitation rate, about 10 years, China’s existing reserves will be depleted and wolframite.

On the other hand, the importance of tungsten recycle in tungsten carbide cutting tools reflect in the following aspects: recovery in more than 50% of tungsten resources used in the manufacture of tungsten carbide cuting tools, and tungsten carbide cuting tools is one of the main application of mode carbide materials. China is the world's largest producer of tungsten carbide cuting tools, tungsten carbide cuting tools due to its high hardness, wear resistance, hot hardness, excellent corrosion resistance, oxidation resistance, etc., so that it modern tool in the field of materials occupies a pivotal position . More than 40 percent of tungsten carbide cuting tools for the production of cemented carbide, and production of tungsten carbide cutting tools consumes a lot of metal tungsten. Thus, the importance of tungsten recycle in tungsten carbide cutting tools is self-evident.

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During the wood machining, as the energy is passed from the tungsten carbide woodcutting tool edge to the wood, so the cutting tool performance could be generally evaluated by the cutting edge profile.



Although the sharper the edge is, the more efficient in focusing the energy will be, it indicates a fast edge deterioration as the same time.Typical cutting edge wear, when cutting wood, is progressive tool nose rounding, which is different from that found when metals are machined in which crater and flank wear often predominate. This typical wear profile consists of a rounded edge joining the rake and clearance faces such that negative rake and clearance angles are produced. The profile has been found to be independent of the tool used or the wood being cut.


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