2012年4月19日星期四
tungsten dart
To get around those problems, most tungsten alloy darts
are now made of mixtures ranging from 70% to 95% tungsten. Lower
density barrels are much cheaper, as they are easier to manufacture with
automated machinery Low density darts also wear faster, from skin
acid, friction, hitting other darts, falling on floors, etc.
As with most products, tungsten darts are not all the
same. Raw tungsten does not melt easily, and is not readily made into
machinable shapes. Tungsten is generally ground into a fine powder,
which is then blended with a variety of other metals that act as binding
agents. In the case of darts, the most common blends contain nickel,
with smaller amounts of copper and ferrous compounds. The mixture is
heated and compressed to make a solid billet or bar, which can then be
machined into darts barrels.
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