Tungsten Dart Billet,Tungsten Dart Price

Adding Elements to Improve Tungsten Carbide Button

Details: Category: Tungsten Information; Published on Monday, 27 July 2015 17:59; Written by xiaobin; Hits: 322

As we know, some manufactory would add a little TaC, which can improve alloy binder component for enhancing the wear resistance, toughness and strength. While it means that more cost and if add excessively, the results would reverse. After the addition of Ni, P in WC-Co cemented carbide can be formed Ni-Co-P, Ni-P and Co-P. The eutectic temperature of Co-P is 1020 degrees, the eutectic temperature of Ni-P is 880 degrees, and Co 1340 degrees lower than the melting point of 1495 degrees and WC-Co's. The main reason is that P atomic adsorption and segregation in Ni, Co particle surface, thereby reducing the energy of surface of Ni, Co particles. Therefore, such alloys in the liquid phase, and it makes early appearance dissolution and precipitation and the formation of the skeleton of solid particles also occurred in advance to make the process more fully sintered at a relatively low temperature. So it can effectively accelerate the speed of hard densification and improve the performance of tungsten carbide button.

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Using Low-Temperature Molten Salt Method to Produce Tungsten Cobalt

Details: Category: Tungsten Information; Published on Monday, 27 July 2015 17:56; Written by xiaoshan; Hits: 337

Using low-temperature molten salt method to produce tungsten cobalt and the producing processes are as follow:

1. In accordance with the mass ratio of 1.17: 1 obtain LiNO3-Na2WO4 mixed molten salt.
2. The Co and W at quantity relative ratio of 1: 1, respectively formulated into aqueous solubility is 1mol/L and then under vigorous stirring, the solution was slowly dropped into Na2WO4 and CoCl2 solution with stirred 30min so that the two solutions were thoroughly mixed.
3. The mixture was filtered, precipitate and washed, dried at 80 ℃ in the oven to give the precursor of CoWO4.
4. to weighed molten salt and precursor by mass ratio of 6: 1 in the mortar mix evenly put it into alumina clamp pot, the pot will be placed in the electric furnace holding 8h at 210,270,340 ℃.
5. After the synthesis reaction was allowed to cool to room temperature, to obtain a solid product, which was after distillation, washing, filtration and drying to obtain the final powder sample.

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Crystallization of Ultra-fine Tungsten Carbide Button

Details: Category: Tungsten Information; Published on Monday, 27 July 2015 17:53; Written by xiaobin; Hits: 300

With the requirement of rock drilling higher and higher, which means that it should has good toughness against impact and high abrasive resistance. And the use of crystallization of ultra-fine structure can obviously improve the performance of tungsten carbide ball button. There is research data shows that carbide binder phase content unchanged, while WC grain size of less than 1μm, alloy hardness and strength of will get obviously improved. What’s more, with the size of WC grain reduced further, the promotion will be more visible.

As the particle has small size, large surface area, and surface strong reactivity, which makes it certain specific properties will be able to simultaneously increase the strength and hardness of tungsten carbide button. Therefore, many of the scholars or researchers study set the goals and directions on the refinement of carbide grains to nanometer so that both of hardness and strength can be enhanced. It can extend the working life of tungsten carbide button and decrease the cost of production.

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Tungsten Carbide Button Optimization Profile

Details: Category: Tungsten Information; Published on Monday, 27 July 2015 17:56; Written by xiaobin; Hits: 344

With the development of deep drilling and oilfield excavation, the performance of tungsten carbide button is also concerned. Most of profiles of tungsten carbide button are ball-shaped, and bullet-shaped. But it would be easily deactivate when we use the ball-shaped and the bullet-shaped would be vulnerable because of lackness of the matrix under a large impact. Based on the effective mechanism of spherical broken rock and bending stress curve theory, some researchers design blunt-resistant tungsten carbide button. It combines the advantages of the ball-shaped with the bullet-shaped, which is composed of two parts, a spherical cap and a cone. Spherical side is used in ball-shaped pressing die, and another approximate cone side is used in wedge pressing so that the effect of rock breaking is improved.

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Tungsten Cobalt

Details: Category: Tungsten Information; Published on Monday, 27 July 2015 17:53; Written by xiaoshan; Hits: 334

Tungsten cobalt chemical formula is CoWO4 and molecular weight is 307.78. It has wolframite structure, CAS number: 12640-47-0. Tungsten cobalt as a functional material widely used in anti-knock, paint additives, catalysts, microwave dielectric ceramics and optical anode materials.
There are many methods for producing CoWO4 which are traditional solid-phase method and wet chemical methods including co-precipitation method, hydrothermal method, spray pyrolysis method and so on. However, these method more or less are some problems, such as conventional solid-phase method need high synthesis temperature, larger energy consumption, the resulting powder particle size is large, irregular shape. While co-precipitation method can effectively realize the reaction components are homogeneously mixed at the atomic scale, but get precipitate requires high temperatures calcination process. Besides, the hydrothermal method more strict on equipment and has complex operation. After a series of studies found that low-temperature molten salt method produce tungsten cobalt not only process simple, and do not ask more of technical equipment, it is conducive to large-scale production.

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