Gold Plated Tungsten Price

Yellow Tungsten Oxide Uses

Details: Category: Tungsten Information; Published on Friday, 06 February 2015 16:52; Written by cq; Hits: 1504

In recent years, tungsten trioxide has been employed in the production of electrochromic windows, or smart windows. These windows are electrically switchable glass that change light transmission properties with an applied voltage. This allows the user to tint their windows, changing the amount of heat or light passing through. Tungsten oxide is widely used for many purposes in life. It is frequently used in industry to manufacture tungstates for fireproofing fabrics, for x-ray screen phosphors and in gas sensors. Yellow tungsten oxide is used as a pigment in ceramics and paints due to its rich yellow color.

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Synthesis of Tungsten Oxide Nanowires

Details: Category: Tungsten Information; Published on Friday, 06 February 2015 16:49; Written by cq; Hits: 1514

Due to the outstanding electrochromic, optochromic, and gaschromic properties, tungsten oxides have attracted great attention and have been investigated extensively. Since one-dimensional tungsten oxide nano materials exhibit superior properties in some promising applications compared with bulk materials, much effort has been made to synthesize tungsten oxide nanowires by using dfferent methods, including a soft-chemistry approach, the chemical vapour deposition (CVD) method, hot-filament-assisted synthesis, flame synthesis and multistage field enhancement of tungsten oxide nanowires.

Tungsten oxide nanowires were prepared by a vapor transport method using yellow tungsten oxide powder as a raw material. The crystal structure and morphology of WO3 nanowires were investigated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The obtained nanowires were hexagonal WO3.

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Ammonium Paratungstate Application

Details: Category: Tungsten Information; Published on Friday, 06 February 2015 16:42; Written by zsq; Hits: 455

Ammonium paratungstate is produced separating tungsten from its ore. Once the ammonium paratungstate is prepared, it is heated to its decomposition temperature, 600 °C. Left over is WO3, tungsten(VI) oxide. From there, the oxide is heated in an atmosphere of hydrogen, reducing the tungsten to elemental powder, leaving behind water vapor. From there, the tungsten powder can be fused into any number of things, from wire to bars to other shapes.

Mainly used in the manufacture of tungsten metal powder like tungsten trioxide or tungsten blue oxide;the downstream products of metallic tungsten powder have tungsten material series, such as tungsten, tungsten and other electric vacuum materials; there are alloy series too, such as tungsten carbide alloy blade, alloy drill, alloy molds, etc.; and other wear, pressure, temperature and other machinery and equipment components.

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Electrical Characterization of Tungsten Oxide Nanowires

Details: Category: Tungsten Information; Published on Friday, 06 February 2015 16:46; Written by cq; Hits: 1480

Compared with other transition metal oxides, tungsten oxides have attracted great attention and have been investigated extensively due to their outstanding electrochromic, optochromic, and gaschromic properties. With those distinctive properties, tungsten oxides have been used to make at panel displays, photoelectrochromic smart windows and gas sensors. Non-fully oxidized tungsten oxides (WO3-x), such as W20O58, W18O49 and WO2, are of particular interest because of their unique electronic characteristics, e.g. tungsten oxide has been found to be a semiconductor, a conductor or a superconductor in different oxidization states.

The W18O49 nanowires are synthesized on the tungsten rod substrate by the CVD reaction in which tin powders are used to control oxygen concentration in the furnace and to aid the nanowires to grow. An appropriate flow rate of Ar and an extremely low oxygen concentration are essential for the W18O49 nanowire formation, which is still in the framework of the VS mechanism. The W18O49 nanowires may have potential applications in electronic nanodevices.

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A Facile Route to Tungsten Oxide Nano Materials (II)

Details: Category: Tungsten Information; Published on Friday, 06 February 2015 16:41; Written by cq; Hits: 1546

Although the arc method has a higher production rate than IGC system, the latter produces larger particles. Hence, a modified technique based on the IGC system was developed, in which blowing gases were introduced to obtain finer particles with better particle size distribution. To retain the benefits of both the arc discharge method and the IGC system, a plasma arc is used as the heat source and blowing gas is applied to quench the evaporated materials in this modified system. A simplified manufacturing process that enhances the purity of the as-prepared products is required. Therefore, an effective method, namely, the modified plasma arc gas condensation technique has been proposed.

A modified plasma arc gas condensation technique was successfully used to synthesize various nano-sized tungsten oxide nano materials with morphologies and structures that may be tuned by controlling the experimental parameters. Various non-stoichiometric WO3−x nano materials could be prepared by tuning the oxygen content during the process. W18O49nanotubes and nanorod bundles were also prepared by He plasma arc with different Ar/O2 ratios. In addition, W18O49/TiO2 core–shell nanoparticles were prepared by evaporating a dual target. In the present study, we addressed the feasibility of the plasma arc gas condensation technique and confirm its potential for nanomaterial fabrication.

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