Tungsten target is often applied as sputtering target for physical vapor deposition. For example, it is used in the semiconductor field to make gate electrode, diffusion barrier, and the like.
And the target of tungsten metal is being largely used by manufacturers of X-ray tubes. The tungsten is in the form of a thick button brazed into a solid block of copper, in some cases weighing as much as half a pound; this forms a lasting and efficient target, even when heavy currents are used for considerable periods of time, as is often necessary when using X-rays for therapeutic purposes. The adaptation of tungsten for this purpose is an example of the great value that lies hidden in the rare and little-known elements, and doubtless other instances of a similar nature will develop as the metals become available.
Studies have shown that tungsten is expected to replace copper as the next generation of semiconductor wiring metal materials.
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