Method and apparatus for manufacturing metal material and metal material
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United States of America Patent
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Apr 18, 2017
Grant Date -
Aug 22, 2013
app pub date -
Apr 1, 2013
filing date -
Oct 13, 2010
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Abstract
The present invention provides a method for manufacturing a metal material. The method comprises a temperature increasing step of increasing the temperature of a silver material having undergone final plastic working to 700° C. or more and less than a melting point of the silver material in a vacuum or a helium gas atmosphere, a heating step of maintaining the silver material at 700° C. or more and less than the melting point, and a cooling step of cooling the silver material to room temperature in a vacuum or a helium gas atmosphere. For a part of the period of the heating step, the silver material is heated in a mixed atmosphere in which hydrogen gas is mixed with helium gas.
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