Tungsten & Sapphire Growth Furnace Price

How to Extract Tungsten Oxide From the Ores

Details: Category: Tungsten Information; Published on Friday, 05 September 2014 17:11; Written by jwy; Hits: 531

The production of the tungsten(VI) oxide from the ores is complicated, and not needed for any UK A level (or equivalent) syllabus. All we are interested in is the final reduction of the oxide to the metal.

Pure tungsten can't be obtained by reducing tungsten(VI) oxide using carbon, because it reacts with carbon to make tungsten carbide. Instead, the reducing agent is hydrogen.

Powdered tungsten(VI) oxide is heated to temperatures in the range 550 - 850°C in a stream of hydrogen.

WO₃+3H₂ → W + 3H₂O

An excess of hydrogen is used, and this carries away the steam produced during the reaction. The hydrogen is dried and recycled.

Great care obviously has to be taken to keep the whole system free of air to avoid explosion risks with the hydrogen at these high temperatures.

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Surface Finishes of Tungsten

Details: Category: Tungsten Information; Published on Friday, 05 September 2014 16:29; Written by Cher; Hits: 551

A colloidal graphite lubricant, which imparts a black coating to "as drawn" tungsten wire, is used to protect the wire from oxidation and to lubricate the wire as it passes through the die. Many applications require tungsten wire with characteristics other than those obtainable in "as drawn" wire. A variety of processes produce wire with a cleaned surface or with a special finish.

After drawing operations have been completed, the wire may be cleaned by exposure to elevated temperatures in a reducing atmosphere. Treating the surface chemically or electrolytically can also clean tungsten wire. (The diameter of the wire may be further reduced after drawing by electrolytic etching.)

The cleaned wire can be electroplated with such elements as gold, silver, nickel and copper, for use primarily in electronic tubes.

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The Investment Value of Tungsten

Details: Category: Tungsten Information; Published on Friday, 05 September 2014 16:06; Written by jwy; Hits: 514

According to the transaction reports, we will talk about tungsten investment value. For the future demand growth for tungsten, hard alloy is still the best field.

Specifically explain in what fields the hard alloy is used?

Hard alloy has three major application areas, the first is the tool used for industrial processing, the second is drilling well used in the exploitation of mines and oil fields. The third is commonly used wear-resistant parts in the industry.

Hard alloy or in other aspects, in addition to the hard alloy, what demand growth space is large in tungsten downstream?

Other areas including: the special steel in which tungsten is used as additives; in some chemical fields, tungsten is also applied as additive or catalyst. Besides tungsten can be used to produce hard alloy, tungsten can also be made into alloy with other metals and these alloys are used in many work materials; Another is tungsten wire and tungsten materials used in lighting field. Cemented carbide field is still the best in the future demand growth, because the Chinese machining tool gradually goes to the high-end stage. As for other tungsten areas, will maintain steady growth of synchronization with the national economic growth.

What is the current development situation of China's tungsten industry?

The so-called high-end refers to the advanced terminal finished tools will become popular among consumers.

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Tungsten History

Details: Category: Tungsten Information; Published on Friday, 05 September 2014 16:27; Written by Cher; Hits: 569

The word "tungsten" is an adaptation of the Swedish tung sten (heavy stone) and was first applied to the mineral scheelite about 1758. The element was first identified in 1781 by a Swedish chemist, K.W. Scheele, for whom the calcium tungstate mineral, scheelite, was later named. Commercially, tungsten is prepared from scheelite.

Further processing results in a yellow powder of tungsten tri-oxides that would be considered extremely pure by most commercial standards. However, the desired properties of tungsten wire are affected so adversely by minute quantities of unwanted impurities that another purification is added. This consists of re-dissolving the hydroxide, purifying the solution, and crystallizing the tungsten out in the form of ammonium paratungstate.

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The Introduction of Tungsten Welding Electrodes

Details: Category: Tungsten Information; Published on Friday, 05 September 2014 15:06; Written by jwy; Hits: 488

Tungsten is featured by high melting point, strong electron emission ability, high modulus of elasticity, low vapour pressure, so tungsten was early used as hot electron emission material.

Properties of tungsten make tungsten be suitable for TIG welding and other electrode materials like TIG welding.

Adding rare earth oxide to tungsten to stimulate the releasing of electrons, which improves welding performance of tungsten electrodes: arcing performance is better, the stability of arc column is higher and burn out rate is smaller. Usually, rare earth additions are: cerium oxide, lanthanum oxide, zirconium oxide, yttrium oxide, thorium oxide, etc..

Pure tungsten electrodes and tungsten electrodes with oxide additions are used for TIG welding.

The virous types of electrodes offer specific advantages on account of their properties. A correct choice of the tungsten welding electrodes is essential for attaining optimum welding conditions. The choice of the types of electrode depends on the material to be welded, the kind of welding current and the required purity of the welds.

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