Tungsten resources in tungsten ore belongs to non-renewable resources, and tungsten resources in tungsten carbide cutting tools material belongs to the secondary resources and renewable resources. As tungsten resource supply increasingly tense, people used the resources of tungsten carbide cutting tools increasingly strong awareness of recycling. Tungsten carbide cutting tools saltpeter method is an important method of recycling tungsten resources in tungsten carbide cutting tools.

Steps of tungsten carbide cutting tools saltpeter method are mainly as follows: the waste and saltpeter placed 900-1200 ° C melted, and then flooding tungsten Na2WO4 form into the solution. Then according to the general method of preparation of WO3 or APT from the solution, cobalt remain in the leached recovered.

Advantages of tungsten carbide cutting tools saltpeter method are wide adaptability, low investment costs, fast response. Disadvantages of tungsten carbide cutting tools saltpeter method are long process, low recovery rate, environment pollution.

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At present, China's tungsten resources supply shortage situation has been presented, this is mainly due to China's tungsten ore resources after a long Luancailanwa blind production of low-end Tungsten waste products are exported, resulting in a growing shortage of tungsten resources.

Considering from the life-cycle of tungsten carbide cutting tools material, tungsten resources sustainable development in tungsten carbide cutting tools industry has two main aspects. On the one hand, the need to develop high-grade carbide tools enhance the performance of tungsten carbide cutting tool materials, improve the utilization of tungsten carbide cutting tools material, recycling of used tungsten carbide cutting tools material, and constantly develop new tungsten carbide cutting tools material, On the other hand, realize tungsten resources sustainable development in tungstencarbide cutting tools industry, needs to do the work of other tungsten carbide cutting tools material.
 

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The quality of blue tungsten oxide has some effect on producing fine tungsten powder, so in order to make more good quality and performance fine tungsten powder, choosing good quality blue tungsten oxide will be the important section.

Firstly, quality blue tungsten oxide are very strict at blue tungsten oxide impurity content, alkali metal, for example, impurities usually is oxygen carriers, and that will delay the oxygen residence time in the powder layer, enhanced chemical vapor migration process, thereby enhancing the tungsten powder particle size.

Secondary, the requirement of blue tungsten oxide particle size, different blue tungsten oxide  particle size at temperature of 800 ℃ through hydrogen the blue tungsten oxide particle size is no the same. The study found that coarse blue tungsten conducive to the production of fine tungsten powder, because coarse particles have good ventilation during reduction and it will help to rule out reducing water vapor.

Finally, the requirements of blue tungsten oxide volatiles, blue tungsten containing different amounts of residual volatiles NH4 and H2O, these volatiles will produce water which will make hydrogen more humidity when blue tungsten oxide reducing tungsten powder. And this is not good for producing fine tungsten powder.

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Using blue tungsten oxide producing tungsten powder is generally taken the ammonium paratungstate or tungsten trioxide as raw material by weak hydrogen reduction. Blue tungsten oxide particle size is not a important factors in determining the tungsten powder particle size. The hydrogen reduction process of tungsten blue is the ultimate effect in determining tungsten powder particle size. Different reduction process parameters of blue tungsten oxide hydrogen reduction method will lead to different tungsten powder particle size and specific surface area. Because in the whole process of the blue tungsten to tungsten is chemical vapor migration, so the intermediate phase can form a relatively complete small faceted surface crystals.

Crystal formation and size depends on the speed of the water vapor formed and the speed of discharged from the difference material layer. So the water vapor concentration has a significant impact on the tungsten powder particle size. It is shown that when temperature lower than 600 ℃ and leading in small humidity hydrogen make reduction reaction, it will producing finer tungsten powder. Therefore, when using hydrogen reduction of blue tungsten oxide producing fine tungsten powder should be strictly controlled reduction process conditions.

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Tungsten target is also known as tungsten sputtering target. It owns high melting point, elasticity, low coefficient of thermal expansion, resistivity and fine heat stability and other properties. And it has been widely applied in electrical industries, chemical equipment (X-Ray tube, thin-film material, semi-conductor integrated circuit), medical equipment, smelting equipment, rare earth smelting, aerospace and many other fields.
Tungsten target implies an X-Ray tube where high energy electrons are directed in a vacuum to strike a tungsten target. Where the electrons strike the tungsten very short wavelength X-rays are generated and pass out through the vacuum tube for use in medical diagnosis and engineering radiography of welds and castings etc. Tungsten has a very high melting point but it is nevertheless melted where the beam strikes for this reason the target is rotated to give a fresh target surface very frequently and the tungsten target is a fairly thin plate welded or brazed onto a water-cooled copper backing. Less than 1% of the electrical energy delivered into the X-ray tube comes out as X-rays; the other 99% is waste heat. Tungsten is chosen for the short wavelength and penetrating power of it's characteristic 

 

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The study found that the calcine temperature for blue tungsten oxide fisher particle size has little effect. It is generally believed that during calcine process due to stress crystals and crystal phase change weight, resulting in cracks or broken into particles of irregular particles, but basically maintained the original APT particle dimensions. Blue tungsten fisher particle size only reflect the particle size dimensions, closely related to APT particle, blue tungsten fisher particle size therefore determined by the APT particle size.

 In-phase component ATB and W20O58 which has different size，at 800 ℃ condition reducing found blue tungsten oxide fisher particle size has a significant impact on  the reduction of tungsten powder. In the case of blue tungsten surface area substantially the same situation, W20O58 phase component blue tungsten oxide fisher particle size from 7.9um to 12.94um, tungsten powder particle size is reduced from 1.7um to 0.99um. The ATB phase component blue tungsten fisher particle size from 6.22um increase to the 14.00um, the tungsten powder particle fisher particle size from 1.25um down to 1.12um.

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Tungsten powder is an important raw material for cemented carbide making. The large crystal grain size will cause cracks or breakage during use carbide. The large crystal grain size is mainly crease by coarse tungsten powder particles.

Therefore, in order to improve the performance of cemented carbide tungsten powder producing becomes very important process. Tungsten powder for the preparation becomes even more important. Blue tungsten oxide producing tungsten powder continues to mature, and is widely used in industry. Currently circulating reducing blue tungsten oxide method to control tungsten powder particle size has been widespread concern.

Firstly blue tungsten obtained from calcine extra virgin ammonium paratungstic in argon, and then after that we found the blue tungsten oxide particle size distribution uneven and also there has large cracks on the practical, but the cracks in favor of hydrogen into the interior of blue tungsten and make reduction which provides favorable conditions for refine tungsten powder particle size. The first time for Blue tungsten oxide reduction we cam obtain tungsten powder particle size between 5-15um. The first reduction of tungsten powder oxidized in the air became tungsten trioxide, and then making a second time reduction which we get tungsten powder particle size between 3-10um. From this we can see that the tungsten powder particle size reduction through the loop once and oxide twice was significantly better than using blue tungsten oxide reduction of tungsten powder for only once.

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Tungsten target is also known as tungsten sputtering target. With high melting point, elasticity, low coefficient of thermal expansion, resistivity and fine heat stability, pure tungsten and tungsten alloy targets are widely applied in electrical industries (such as, LED and LCD), chemical equipment (X-Ray tube, thin-film material, semiconductor integrated circuit, two-dimensional display, solar photovoltaic and surface engineering.), medical equipment, smelting equipment, rare earth smelting, aerospace and many other fields.
Now a new way-PVD (physical vapor deposition) has been used to sputter thin-film material. The product made in this way owns high density, smooth surface, no stratification, no double skin, no crack and no impurity and good adhesiveness. And with the growth demand of high pure metal and alloy targets, the magnetron sputtering techniques has been widely applied. It can work with both older sputtering devises as well as the latest process equipments, such as large area coating for solar energy or fuel cells and flip-chip applications.

 

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Blue tungsten oxide is widely used in industrial processes mainly because of blue tungsten has many advantages such as high chemical activity, good doping effect, large surface area, reducing efficiency. China added K, Si, AI and other alkali metal oxides to produce tungsten wire is applied from the mid-1970s to the present.

But using blue tungsten oxide technology manufacture tungsten wire not only require a lot of money and equipment, and it also will bring great problems at repression which will cause tungsten blanks low yield, increased production costs. At the part of adding blue tungsten oxide pickling process will produce Hydrofluoric acid and it will lead to contamination the environment. So that subsequent processing pickling process more complex.

From the process is applied to the industries to now it has being developed and improved, for example, controlling the temperature when APT reduction the blue tungsten, tungsten powder ingredients doped est.. At present, the process has been able to meet the needs of electric light source industry basically. And not-acid washing of blue tungsten oxide process has also made a great progress, so that the improvement of the quality of tungsten blanks, decrease production costs.

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While applying tungsten carbide wood cutting tools to deal with cutting of wood products, the relevant temperatures would likely to affect the type of wear mechanisms, and which also shows the tendency of breaking out high temperature oxidation of cobalt. Although some researchers argued that the temperatures measured during woodcutting are not high enough to cause oxidation of the tungsten carbide grains and the oxidation of cobalt occurs in air over a wide range of temperatures above ambient temperature and that the oxidation rate is very low, below 700°C . The differing opinions on this mechanism is mainly due to the inability to directly measure the temperature at the cutting edge and possibly also due to the type of micro-analytical methods used to examine the worn surfaces. X-ray photon spectroscopy (XPS) is a good technique which can be used in the determination of oxides. However, this method has rarely been used and thus the type of reactions and mechanisms caused predominantly by the cutting temperatures remain unclear.

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