Tungsten & Sapphire Growth Furnace Price

Tungsten Dart Billet

Details: Category: Tungsten Information; Published on Tuesday, 03 February 2015 19:35; Written by xsh; Hits: 558

Tungsten is a very dense material, so darts with a considerable weight can be made slim.Billets are actually tungsten cylinder rods after surface grinding by center-less processing, and their weights are varied from different tungsten contents and rod sizes. Tungsten is used in dart production because of its high weight to volume ratio. The higher percentage of tungsten used to make a dart which is the slimmer and sleeker. Tungsten billet is the raw material of barrel which forms the main part of tungsten dart.

Nowadays, lots of people are like to buy the tungsten dart billet very much, because of there are advantage for using.

The higher the percentage, the slimmer the dart will be, resulting in increased higher scoring chances. A 90 % tungsten darts will be slimmer than an 80 % with the same weight and length.

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Tungsten Oxides Colours (III)

Details: Category: Tungsten Information; Published on Tuesday, 03 February 2015 19:32; Written by cq; Hits: 1946

The colours of the tungsten oxides are a result of the fact that the absorption and emission of photons (light) are dependent on wavelength. If the material has a low reflectivity at the short wavelength end of the spectrum (460-480 nm) it appears yellow to orange, because only the green and yellow part of the light is reflected. If it has a low reflectivity at the long wavelength end of the spectrum (550-700 nm), it appears blue or violet. If all components of the white light are absorbed and not re-emitted, the material appears black.

Colours can significantly change with different valence states within an oxide structure, although the parent structure of differently coloured oxides basically appears the same (due to changes in absorption and reflection and/or transmission). Inherent colours also change with the size of the particles, and the colours of powders therefore can significantly differ from those of single crystals. Thin films of tungsten trioxide are even transparent, but can be readily coloured by impurities which are used today for electronic devices.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-powder.com
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Extracting Ammonium Maratungstate by Solvent

Details: Category: Tungsten Information; Published on Tuesday, 03 February 2015 18:06; Written by zsq; Hits: 486

Solvent extraction is besed on ammonium tungstate solution of the ester (D2EHPA) or tributyl phosphate (TBP) and kerosene solvent composition of the organic phase with an organic extractant di (2-ethylhexyl), and extracted ammonium tungstate in an ammonium ion, so that Ph value to 2 to 4, generated by digestion of ammonium metatungstate solution. Concentrated crystallization, filtration separation, drying products.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-powder.com
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Tungsten Oxides Colours (II)

Details: Category: Tungsten Information; Published on Tuesday, 03 February 2015 19:28; Written by cq; Hits: 1898

Stoichiometric compounds such as W20O58, W18O49 or WO2 are formed intermediately during the reduction process and can be isolated by interrupting the reduction process at the selected reduction state.

All , characteristic crystal symmetries, and also peculiar crystal forms. They are commonly not visible to the naked eye, as the powder particles are too small for a simple visual detection.

However, they can be made visible by looking at the powders with the help of an electron microscope where distinct differences of the crystal forms can be clearly recognised.

Colours of the tungsten oxides, prepared by interrupting the reduction process at selected reduction stages: yellow WO3, blue W20O58, violet W18O49, chocolate-brown WO2, and grey W metal.

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Extracting Ammonium Maratungstate by Ion Exchange

Details: Category: Tungsten Information; Published on Tuesday, 03 February 2015 17:50; Written by zsq; Hits: 484

Ion exchange with ammonium paratungstate as raw material, ion exchange Prepared metatungstate: heating paratungstate 1 ~ 8 h at 130 ~ 140 ℃, the resultant slurried, boil 2 ~ 6 h at 80 ℃ ~ 100 ℃ generate metatungstate solution. Then concentrated