Violet tungsten oxide was prepared with pure ammonium paratungstate in argon gas. Tungsten powder was obtained from violet tungsten oxide through deoxidation in hydrogen gas (rate of purity: 99.99%, dew point: –40 °C), and tungsten powder was oxidized in the air. Tungsten oxide was reduced to tungsten powder in hydrogen gas. The samples were characterized with the laser particle size distribution measuring instrument and the electron probe scan instrument. The results show that submicron tungsten powder can be obtained through circulatory oxidation twice and reduction three times. The percentage of the particle size distribution of submicron spherical tungsten powder is 95.73% between 0.1 μm and 1.0 μm, and its BET is 1.082 m2/g.

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There are few tips which is important for long life dartboard.

First, you must remember to rotate your dartboard. While this will only work if your care dartboard has the removable metals ring with the numbers on it, if the numbers are painted on the board, you will not be able to rotate it. Frequently rotating the board will make it last longer.

Then remember that do not spray any types of liquids on a bristle board, which will ruin your dartboard.

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Paper dartboards are made different from wooden dartboards. Instead of pieces of wood connected together, paper is wound tightly to the dartboard. When a dart hits the board, it sinks into a seam in the paper.

The reason why using a paper dart board is that the darts never take away at the paper the same way they chew up wooden boards in theory. The darts on a paper dartboard will slip between the layers of paper, and if twisted out, they leave no trace, so that the paper dartboard may have longer life compared with wooden dartboard.

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Wooden dartboards are made from end grain pieces of basswood.

Wooden dartboard comes in two sections, a center section which is a circular area that includes the blue rings, and an outside "frame" area. The center section will rotate, although it usually takes a bit of elbow grease at first.

Since the same innings are often used over and over, wooden dartboard wears unevenly, to prevent that, you can rotate it which will let dartboard get as much life as possible.

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Triangle dartboard is not refers to the shape of the board, but that the shape of the wire. Many types of dartboards are with circle wires, while triangle dartboard are with triangle shape iron wire, which greatly reduces the risk of darts bounce outs by wire.

Many important champions such as world darts championships adopt the triangle dart board.

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More than 500 years ago, dart spent a long time to development.the United Kingdom soldiers who had been ejected in battlefield, it was competing with the bow and arrow was a weapon aiming at a specific target in the battle of leisure has been said that it is roots you.

Then, they throw using only arrow without a bow, target also changes to what was a large tree in round slices, it went a current form. Then it spreads around the world, and led to dart development to boom of today is transmitted to Japan.

Darts, unlike normal sport (competition), rather than the addition competition basically, it is subtracted competition. Therefore, you can feed the judgment that thought of computational power and earlier. Mental target competition, strengthening of the autonomic nervous, concentration sustained enhancement, in addition to the stimulus to the cerebral cortex, because the competition that you respect the manners, such as manners of discipline is attached to the body, the youth as Education and Sports. If there is a wide range of improvements and utility stood, we come to be recommended.

In addition, upon the aging society, and that the momentum is not so many, improvement of physical function, as rehabilitation and blur prevention, including the recovery effect, now not only the competition purposes, as education and lifelong sports, both young and old making it familiar.

More than 500 years ago, dart spent a long time to development.the United Kingdom soldiers who had been ejected in battlefield, it was competing with the bow and arrow was a weapon aiming at a specific target in the battle of leisure has been said that it is roots you.

Then, they throw using only arrow without a bow, target also changes to what was a large tree in round slices, it went a current form. Then it spreads around the world, and led to dart development to boom of today is transmitted to Japan.

Darts, unlike normal sport (competition), rather than the addition competition basically, it is subtracted competition. Therefore, you can feed the judgment that thought of computational power and earlier. Mental target competition, strengthening of the autonomic nervous, concentration sustained enhancement, in addition to the stimulus to the cerebral cortex, because the competition that you respect the manners, such as manners of discipline is attached to the body, the youth as Education and Sports. If there is a wide range of improvements and utility stood, we come to be recommended.

In addition, upon the aging society, and that the momentum is not so many, improvement of physical function, as rehabilitation and blur prevention, including the recovery effect, now not only the competition purposes, as education and lifelong sports, both young and old making it familiar.

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Separation of tungsten and molybdenum in production process of ammonium paratungstate is important working procedure ,but this is always one of difficult technical problems .General flows of various ammonium paratungstate technologies and basic nature of molybdenum were summarized .Moreover advantages and disadvantages of each separation method for tungsten and molybdenum in production process of ammonium paratungstate were systemarically analyzed .A nalysis results indicated that there many advantages , such as short process folw small tungsten loss, good molybdenum eliminating effect, simplicity of operation,low environmental pollution and economy feasibility to eliminate molybdenum by ion-exchange method . It is precisely because of these advantages, ion-exchange method to eliminate molybdenum has a good industrial application prospect.

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By evaporating and neutralizing of two ammonium tungstate with different density ,crystals of ammonium paratungstate (NH1)10W12O11·Nh2o(n=11,7,5)were prepared with ultrasonic .UsingXRD,DTG and granularity analysis, the crystalline form was confirmed and researched .The results proved that the effect of ultrasonic on ammonium tungstate was in evidence .The crystalline forms were the same with ultrasonic and without ultrasonic, but impure apexes on the XRD patterns were less and value of d/A more tallied with literature with ultrasonic . Distributing of crystalline granularity became narrower and the crystal was more homogeneous. Ultrasonic shortened the formation time nucleus of crystal .

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Ammonia in APT crystal mother liquor was removed by adding sodium tungstate with sodium hydroxide and magnesium salts. The results show that the content of ammonia in the treated solution can be removed down to 0.042g/L up to 98.8 ％ removal rate. The resultant sodium tungstate solution was diluted 10 times befote prepared as ion exchange feed solution., the content of ammonia in the raffinate is less than 0.0005％, which can meet China national discharge standard .

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A refractory metal tungsten carbide hard metal compound and a binder made by powder metallurgy method, its hardness (HRA) is 89 to 94, much higher than the high-speed steel; at 540 ℃ hardness (HRA) 82 to 87, and the hardness of high-speed steel normal temperature (HRA83 ~ 86) fairly, but also has good chemical stability, heat resistance advantages. Tool materials currently used for a lot of variety though, the new tool materials are also emerging, but still very popular tungsten carbide tool material kind.

In order to prevent the material as a result of crack propagation due to the failure, and is favorable for obtaining a high-performance tungsten carbide cutting tools material may gradient processing, the surface area of the coated substrate formed lack toughness cubic tungsten carbides and carbonitrides of region, this region is higher than the binder content of the nominal binder content of the coating substrate; when a crack is formed in the coating extended over the area, because of their toughness, crack propagation can absorb the energy, it is possible to effectively tungsten carbide cutting tools to prevent cracks internal expansion, improve the performance of tungsten carbide cutting tools.




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