This is an invented way of tungsten target manufacture which involves the following procedures.
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Machine the surface of tungsten target blank.
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Place the machined blank into the vacuum bag and then drain away the vacuum.
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Forge the blank in the vacuum bag.
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Calendar the forged blank.
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Cool and remove the vacuum bag.
This way is mold-free and can effectively defend the surface of blank from cracking and oxidizing while processing. The structure of tungsten target made by this way is well-distributed with suitable grain size that sputtering target required. What is more, this sort of tungsten target can be processed with ease under low scrap rate. The method is particularly in need when manufacture large-sized tungsten target.