Why Tungsten Alloy is Used as Gold Substitution?
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- Category: Tungsten Information
- Published on Tuesday, 08 October 2013 11:52
- Written by Cher
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In theory, as its density is 19.1g/cm3, which is approximately 70% denser than lead, uranium could be used as material of making fake coin. However, it is weakly radioactive and not as dense as gold, so it does not appear to be a practical method. Then people have discovered that tungsten is environmental-friendly, durable and hardness, the most important is that its density of 19.25g/cm3 is just about the same density as gold (19.3g/cm3), which bears the similar specific gravity. These advantages make tungsten enjoys the superiority to be the best substitute for the costly metal of gold or platinum. It is necessary to tell that alloying gold with tungsten would not work for several reasons but a coin with a tungsten center and gold all around it could not be detected as counterfeit by density measurement alone.
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Tungsten Boring Bar and Tungsten Bucking Bar
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- Category: Tungsten Information
- Published on Tuesday, 08 October 2013 10:14
- Written by Cher
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Tungsten heavy metal boring bars are manufactured in sintered or polished alloys of 90%-95% tungsten with a nickel-copper-iron-moly matrix. These alloys are very similar to tungsten-carbides but the chemical composition is developed differently to reduce embrittlement. The high density (twice as heavy as steel) and tensile strength (110 kpsi) of this alloy makes the ideal combination for chatter free tools and supper chatter free tools. Heavy metal boring bars greatly enhance boring application by absorbing vibration and drastically reduce chatter, enabling to machine deeper bores with greater precision and finish.
Tungsten heavy alloy bucking bars are denser than steel, resulting in a bucking bar of the same weight but half the size. Bucking bars are used in rivet setting to upset the shank of the rivet. Tungsten Heavy Alloy bucking bars reduce the recoil when reflecting the impact back to the rivet shank.
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The Advantage of Tungsten Bucking Bars
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- Category: Tungsten Information
- Published on Tuesday, 08 October 2013 09:46
- Written by Cher
- Hits: 1688
The tungsten bucking bars are designed to significantly reduce vibration and provide greater comfort for the operator. These bars are up to twice as heavy as their ductile iron counterparts. Results have shown that using Tungsten bars is far superior to ductile iron and helps to reduce carpel tunnel syndrome. All edges are burr-free and all surfaces are polished to provide superb riveting results.
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Bucking Bar Knowledge
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- Category: Tungsten Information
- Published on Tuesday, 08 October 2013 10:08
- Written by Cher
- Hits: 1616
A bucking bar is used to form the shop head of a rivet. It is held against the shank of a rivet and as the rivet gun bangs on the factory head the bar 'bucks' against the shop head causing the metal to deform. That deformation mushrooms the shank forming the shop head. There are many shapes, sizes, and weights of bucking bars. Many are shaped and sized for special-purpose (generally difficult) situations. Pictured is a typical set of bucking bars.
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Properties of Silicon Carbide
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- Category: Tungsten Information
- Published on Monday, 30 September 2013 18:04
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SiC is a ceramic material with an outstanding hardness, only surpassed by diamond, cubic boron nitride and boron carbide. The material is highly wear resistant and chemically inert to all alkalies and acids. It is also highly heat resistant. These properties makes Silicon Carbide an outstanding abrasive and ceramic material to be used under extreme operating conditions.
• Density: 3.21 g/cm3
• Vickers hardness: 29 GPa
• Coefficient of Thermal expansion: 5·10-6/K
• Thermal conductivity: 50 to 100 W/m K
• Typical temperature resistance: 1500°C in air, 2400°C in inert atmosphere
• Specific heat: 750 J/kg K
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