Method for surface treating a die by electron beam irradiation and a die treated thereby
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United States of America Patent
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May 23, 2006
Grant Date -
Oct 2, 2003
app pub date -
Mar 27, 2003
filing date -
Apr 1, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method for surface treating a die made of metal in which a low energy, pulsed electron beam, which does not scatter, performs a treatment over a wide area due to presence of anode plasma in a chamber in which the electron beam is formed to smooth and gloss a surface of the die and increase a surface hardness and corrosion resistance of the die. The irradiation may be performed with an energy density not less than 1 J/cm.sup.2 per pulse, at least 5 pulse irradiations and a pulse duration of at least 1 .mu.s. A die subjected to the surface treatment method exhibits improved surface smoothness and glossiness, as well as high corrosion resistance.
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