Gold Plated Tungsten Price

Plying Cricket

Details: Category: Tungsten Information; Published on Thursday, 05 February 2015 18:59; Written by xsh; Hits: 410

To start the game, each player or one player from each team throws one dart. This is known as the "diddle". The player whose dart lands closest to the center goes first. Generally, if both players darts are in the same section of the bulls eye or in the event of a tie, each player throws another dart until there is an obvious winner. During a player's turn, the player throws three darts. After the last dart, the player's score is totaled. Any number that has not been scored three times is considered to be open.

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Cricket Scoring

Details: Category: Tungsten Information; Published on Thursday, 05 February 2015 18:52; Written by xsh; Hits: 421

The object is for a player to hit each number and the bulls eye three times. Doubles count as two hits and triples as three. The first player to hit a number three times owns that number and it is said to be opened. Further hits on the opened number score that number of points (e.g. triple 20 gains 60 points) until the opponent also hits that number three times and closes it, then that number is removed from play. The double ring scores double the number's value and the treble (inner) ring scores triple the number's value. The outer bulls eye ring is worth 25 points and the inner circle (or double bull) is worth 50. Once a player has opened or closed all the required numbers and bull and has equal or more points than his opponent, that player wins. Also, if a player scores and does not record it before the next player goes, that score does not count.

Alternatively, cut-throat style scoring can be used, in which case points are undesirable; hitting a number that is opened results in points being given to any other players who do not have that number closed, and the lowest score wins.

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Tungsten Crystal Growth during Hydrogen Reduction of Tungsten Oxide (II)

Details: Category: Tungsten Information; Published on Thursday, 05 February 2015 18:29; Written by cq; Hits: 1565

In order to obtain coarser powder, the normal method is reducing and carburizing treatment of tungsten oxide in the presence of alkali metal compounds at high temperature. Thus, the obtained powder particle size can be above 50 µ m (Fsss). But its defects and micro-strain are relatively more than those of the powder without addition of dopant. Some researches show that the crystalline perfection of tungsten carbid e grain in the alloy can be impaired by tungsten starting material which undergoes the adulteration of alkali metal.

At high temperature, yellow tungsten oxide (WO3) is reduced to metal tungsten under hydrogen in the stepwise reduction sequence of WO3→WO2.9→W 18O 49→WO2→W. The overall reduction rate is limited mainly by the WO2→W transition. The nucleation and growth of

W grain occur in the WO2→W transition.

The technical conditions of WO2→W transition greatly affect the grain size, uniformity and crystalline of W powder.

In order to obtain coarse-grain tungsten powder, the transition of WO2→W must proceed under relatively high pH2O/pH2 in hydrogen atmosphere throughout.

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Tungsten Oxide Nanorods Growth from Heated Tungsten Foils

Details: Category: Tungsten Information; Published on Thursday, 05 February 2015 18:35; Written by cq; Hits: 1509

Tungsten oxides nanostructures have exhibited application perspectives in such fields as electrochromic (EC) devices, photocatalysis, gas sensing, adsorption of organic dyes, etc. So far, in most high-temperature-reaction fabrications of the tungsten oxide nanostructures, the reactant sources and the substrates are separated. Occasionally, tungsten oxide nanostructures are grown directly from the metallic tungsten, which serves as both the reactant source and the substrate. The advant ages of direct heating method include short fabrication time, convenient manipulation, less expensive instrumentation and easy accession to high reaction temperatures. Most importantly, tungsten ox-ide nanostructures can grow directly from, instead of depos-iting on, the substrates. Therefore, a number of desired properties, such as good adhesion and low contact interface resistance, can be expected.

As previously reported, a fast heating chemical vapor deposition (CVD) system was developed, in which the temperature of the carbon substrate could be raised to 1800°C in 15 seconds with the passage of large electric current. Combined structures of conical carbon fiber and carbon nanotube (CCF/CNT), which had large length, good straightness and perfect crystallinity, were fabricated using this system. Recently, tungsten oxide nanostructures were also attained with similar instrumentation.

Nanorods of W18O49, an oxygen-deficient nonstoichiometric tungsten oxide, were fabricated by directly heating W foils. In the fabrication, the W foils functioned as both the sub-strates and the reactant sources. Other necessary conditions included the coverage of the substrates with KBr and the introduction of low pressure wet oxygen. The oxidized W surface and the KBr on it combined into eutectic droplets and tungsten oxide segregated from them due to supersatu-ration. This growth is referred to as an SLS process. Field emission was obtained from the such-fabricated W18O49 nanorods and the UPS analysis suggested that the emitted electrons were likely to have come from the conduction band, impurity levels and/or surface states of these nanorods.

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Tungsten Crystal Growth during Hydrogen Reduction of Tungsten Oxide (I)

Details: Category: Tungsten Information; Published on Thursday, 05 February 2015 18:26; Written by cq; Hits: 1478

In these years, significantly incremental enhancements and specialized developments in the area of hardmetal continued shift towards ultra-fine and ultra-coarse grades. Compared with conventional cemented carbide (middle grain or fine grain carbides), ultra-coarse grain cemented carbides(＞5µm) demonstrate good fracture toughness and thermal fatigue resistance. Thus, they attract much attention from different departments in the area of industry. Currently, it is widely applied in many fields and found increasing usage in areas such as milling tools, punching dies, and boring drills. Coarse grain W and WC powders are key materials for ultra-coarse grain cemented carbides producing. The industrially established method of preparing tungsten and carbide is the hydrogen reduction of tungsten oxide, tungstic acid or ammonium para tungstate at 900-1 200℃ or even higher temperature, initially to the metal powder followed by carburization. The average particle size of the powder obtained in this way is below 12 µm (Fsss).

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