Tungsten carbide cutting tools nanocomposite reinforced refers to that join nanoparticles in fine grain carbide matrix, reinforced tungsten carbide cutting tools nanocomposite reinforced can improve the material properties of tungsten carbide cutting tools.

Mechanisms of tungsten carbide cutting tools nanocomposite reinforced are as follows: nanoparticles dispersed in a matrix material of tungsten carbide cutting tools having dispersed toughening effect. When the addition of nanoparticles in a matrix material particles in the matrix material by stretching the tissue transverse cross-section contraction effect, but to achieve the same substrate transverse shrinkage, you have to increase the longitudinal tensile stress, so you can make more material consumption more energy, play a toughening effect.

In addition, the dispersed cemented carbide substrate material carbide nanoparticles can inhibit grain growth during the sintering process, integrated to improve the mechanical properties of tungsten carbide cutting tools.


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A tungsten carbide drawknife is often used in wood shavings removing for flat faceted work. Since it lacks of cutting superior and shaving precision, which could just shape roughly rounded or cylindrical billets. But it is still qualified for the prework of wood for the further lathe processes. Specially it is also an important hand tool for cricket bats’ curve making

The tungsten carbide drawknife is ideally suited to work with shaving horse, which could let the users be seated and safely grip the working pieces with the additional power from their legs. It aimed to finely take away the wood fibers while the users gently levers the blade to "bite" into the wood and then controls the depth of the cut by raising or lowering the handles as he pulls the drawknife.


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A tungsten carbide router bit is the business end of a router or spindle. Its purpose in life is to remove material. It could use the total amount of carbide to make the bit, but it also can be more cost efficient by welding the chunks of carbide to a steel body. As there are variety styles of routers in the application of cutting, trimming and wood shaping processes, the tungsten carbide router bits is also comprises hundreds of varieties patens to match these versatile tools. Generally the bits could be cataloged into edge bits, non-edge bits and anti-back ones.


Edge bit owns a small wheel bearing to function as a fence against the work in shaping the edge moldings. On the contrast, non-edge bits require the additional use of a fence to set either on a router table or attached to the work or router. Anti-kickback bits employ added non-cutting bit material around the circumference of the bit's shoulders which serves to limit feed-rate.


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The tungsten carbide down-cut spiral router bits are designed to cut the working pieces from the top surface down to create a smooth edge at the surface. It makes effort to push down on the material being cut, and helps hold the material in place on the table surface. This bit is proffered by some users due to it packs the sawdust in the groove being cut, this helps hold parts in position and helps maintain vacuum when that type of hold down system is used.



The shortcomings of the bit are the packed sawdust is not automatically removed by the dust collector but must be manually scraped or brushed off . Also this bit is not appropriate for thermoplastics as the "packing" of the dust re-welds the parts together. When making "through cuts" the down cutting force can splinter the bottom face of veneered or other susceptible materials.


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Tungsten carbide drawknife is a traditional hand tool widely applied in wood working processes. It is meant to shape the wood by removing the large slices of wood. The tungsten carbide drawknife is completed with two handle at two ends, a blade made from tungsten carbide,which is tarnish resistant and extremely strong.

Specially, the length of the blade is always longer than its width. In terms of the handle at each end, which commonly designed to below the level of the blade or at the same level as the blade. It is used by pulling or drawing towards the user. During the woodworking, the blade lends itself to shape complex concave of convex curves.


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Cobalt 60 is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. It can emit 315KeV high speed electronic and two beams of gamma rays through beta decay. The main β-decay transitions are shown. The probability for population of the middle energy level of 2.1 MeV by β-decay is 0.0022%, with a maximum energy of 665.26 keV.

Due to its high density and excellent absorption behaviour against electromagnetic radiation such as X-rays and gamma-radiation, tungsten alloy can be widely used in cobalt 60 tungsten radiation shielding to protect the damage from Co 60 radiation. Cobalt 60 tungsten radiation shielding can be used in industrial of radiography,medical radiotherapy,and food irradiation and blood irradiation.

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Tungsten bronzes are a special class compounds which is non-stoichiometric and the chemical formula is MXWO3 (0 <X <1). The M of MXWO3 can be an alkali metal, calcium, strontium, barium, rare earth metals, copper, ammonium, hydrogen and so on. Such compounds are more exist in hexagonal, cubic and tetragonal, its structure is basis on WO6 octahedral structural, forming a layered having a six-membered, five- or four-membered ring channels through the apex of a rigid skeleton structure of tungsten oxide structure. Such compounds have special physical properties, which generally has a high electronic conductivity and faster ion transport properties, which conducts electricity can achieve 2.5 × 10⁶Ω^-1m^-1, is a low-temperature superconductors. Recently it was widely used in electrochromic displays, electrode and PH sensors and other area, so then it becomes a hot issue again. Many methods for preparing tungsten oxide bronze, common in three ways: a solution of chemical reduction, electrochemical reduction, thermal reduction method.

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Method of manufacturing a non-sag tungsten wire for electric lamps to essentially eliminate aluminum and silicon as contaminants in a doped tungsten wire, the tungsten wire is obtained by mechanical working of reduced tungsten blue oxide which contains as a primary or major constituent a special hexagonal ammonium tungsten bronze of the general formula (NH4)x (NH3)y WO3. A liquid doping step is carried out by adding a solution containing potassium nitrate, the special doped ammonium tungsten bronze forming preferably more than 70% by weight of the overall tungsten blue oxide. The special hexagonal ammonium tungsten bronze is made by decomposing ammonium tungsten in an ammonium atmosphere, preferably at a temperature between about 400° and 550° C.

Process of making a non-sag tungsten wire for electric lamps to dope ammonium tungsten with potassium, essentially devoid of silicon and ammonium, an aqueous potassium containing solution, preferably potassium hydroxide is added to an aqueous solution of ammonium tungsten, in a mol relationship of potassium to ammonium of between 0.1 and 10. The doped ammonium potassium tungsten is obtained. This ammonium potassium tungsten is then converted to tungsten blue oxide, which is reduced, preferably in hydrogen containing atmosphere and a tungsten powder is then obtained which will be doped with 40 to 120 ppm, preferably about 90 ppm of potassium. Lamps equipped with tungsten wire wires drawn from so doped tungsten have lifetimes at least 10% more than lamps with conventional tungsten wires.

 

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Tungsten oxide of pyrochlore phase is a compound having many microporous channel structure, which has the chemical formula M2B2O6O ', where M, B is a metal atom, and O' is monohydrate crystals. Tungsten oxide of pyrochlore phase distorted on the WO6 octahedral structural basic, through the top angle of the tungsten oxide rigid skeleton to build a layered structure having a six-membered ring channels, and has a three-dimensional channel in the direction of. Because of its mesh sieve and metastable structure, physical and chemical properties of tungsten oxide pyrochlore type changed significantly, not only to make it conductive, adsorption performance enhancements, and catalysis, sensors, electrochromic, electromagnetic and other fuels in wait until applications. This kind of phase synthesis method is mainly two: one is soft chemical synthesis, and the other is hydrothermal synthesis.

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Ultrasonic cavitation method due to its unique physical and chemical effects in the production of nanometer tungsten trioxide can gain good results. Because using ultrasonic cavitation method will cause high temperature and a lot of bubbles in the solid particles surface and all of this will reduce the nucleation specific surface. Thereby it can inhibit the nucleation coalescence and growth. In addition, because using ultrasonic cavitation method it will cause shock waves and microjets crushing effect so the gel precipitation will be molecule. Using ultrasonic cavitation technology, through the cavitation will cause local temperature, high pressure or strong shock waves and microjets and so on, and all these can greatly reduce the binding force between nanoparticles, thereby effectively preventing agglomeration phenomenon.

It is useful to prepare a microporous structure with a high specific surface area, highly crystalline nano tungsten trioxide. The preparation method is: adding configured sodium tungstate into cation exchange resin column with uniform and then putting the tungsten acid solution which is exchanged in the beaker. It will form a gel after cooling. Place 1 or 2 days, adding distilled water ultrasonic dispersion gel 20min, centrifuged at 8000r / min 1h to obtain a precipitate. Then repeat the process after 1,4,7,10 times were 100 ℃ vacuum drying or drying, it can be obtained with a small amount of water of crystallization of nano-porous tungsten trioxide different samples at room temperature.

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