What Are The Characteristics of Tungsten Alloy Car Weight?
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- Category: Tungsten Information
- Published on Sunday, 15 February 2015 08:51
- Written by Sherry
- Hits: 434
Heavy alloy (tungsten) is a kind of material as the substrate of tungsten (W content of 85-99%), and added Ni, Cu, Co, Mo, Cr and other elements of the alloy. Press alloy composition characteristics and uses into W-Ni-Fe, W-Ni-Cu, W-Co, W-WC-Cu, W-Ag and other major series, having a density of up to 16 .5-19.0g / cm3, and is the world known heavy alloy, it has a range of excellent features, heavy: General accounting for high 16.5-18.75g / cm3 ,, strength: tensile strength 700-1000Mpa, strong ability to absorb radiation: its capacity than lead 30-40%, thermal conductivity coefficient: 5 times mold steel; thermal expansion coefficient is small: only iron or 1 / 2-1 / 3, good conductive properties of steel; has good weldability and formability . Given the high proportion of these alloys have excellent features, it is widely used in the aerospace, aviation, military, oil drilling, electrical instrumentation, medical and other industries.
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Dart Barrels
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- Category: Tungsten Information
- Published on Friday, 13 February 2015 18:00
- Written by xsh
- Hits: 494
There are many different types of darts on the market from brass though to tungsten by far the most popular are tungsten nickel darts. Dart barrels is a dense heavy weight metal ideal for darts.
Tungsten has been used for the production of darts since the early 1970's because it is twice as dense (heavy) as brass and a dart made from tungsten will be half the size of a brass equivalent. This means it is easier for a player to achieve close grouping and score the maximum 180!
High percentage tungsten darts cost more than lower content dart barrels, the main reason for this is down to the machining of the billet. High percentage tungsten darts take longer to make and wear the cutting tools faster. The speed of the cutters has to be turned down to a slower speed so to prolong the life of the cutting tool therefore this increases the production cost of making the finished dart barrels.
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Shape and Particle Size Distribution Effect on APT Crystal
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- Category: Tungsten Information
- Published on Friday, 13 February 2015 16:50
- Written by zsq
- Hits: 466
The physical properties of APT sample prepared in our research were measured in comparison with some commercial APT samples produced by traditional APT samples produced by traditional method. It has been observed that the APT sample using our method has a shape nearly regular cubic crystal and even particle size, while the commercial samples have relatively bad regularity, besides some cubic crystals, there are some topical tabular crystals and some rod-like crystals, and the particle size distribution is uneven.
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Preparation of Ammonium Paratungstate with Coarse Grain By Evaporating Crystallization
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- Category: Tungsten Information
- Published on Friday, 13 February 2015 16:53
- Written by zsq
- Hits: 475
In the recent years , many users at home and abroad have strict quality requirement not only in chemical composition but also in physical properties . Including particle-size and distribution (or apparent density ), crystal shape and so on .therefore, it is important to investigate the preparation of APT with coarse grain has been investigated systematically. A new technology for the crystallization of ammonium paratungstate with coarse grain has been studied. The factors influencing the physic-chemical properties of ammonium paratungstate crystal, such as temperature ,concentration in the process, and the addition of seed crystal and agitation with air is also in favor of the system. Ammonium paratungstate crystal with particle size of 36-42um and apparent density of 2.0-2.2g/cn-3 were obtained by controlling suitable technological parameters.
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Agitation Effect on APT Crystal
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- Category: Tungsten Information
- Published on Friday, 13 February 2015 16:43
- Written by zsq
- Hits: 523
Agitation can promote the relative movement between solid and liquid, and make the concentration and the temperature in the solution even. Moreover is also favorable for crystalline grains growing evenly in all directions, so coarse grains with large apparent density can been obtained. The crystalline grains may be fined when the speed of agitation is very great. For this reason, experiments of two different kinds of agitation, mechanical agitation and air agitation, has been carried out. The experiments indicate that the apparent density of APT crystals obtained by air agitation is usually coarser than that obtained by mechanical agitation. This may be because the mechanical action upon the crystal caused by air flow is weaker than that caused by mechanical agitation.
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