Hybrid lead-free solder wire
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United States of America Patent
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Jun 25, 2019
Grant Date -
Feb 1, 2018
app pub date -
Oct 4, 2017
filing date -
Mar 21, 2016
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Abstract
A braided solder wire rope includes a first alloy including Bi—Ag, Bi—Cu, Bi—Ag—Cu, or Bi—Sb; and the second alloy including Sn, In Sn—Ag, Sn—Cu, Sn—Ag—Cu, Sn—Zn, Bi—Sn, Sn—In, Sn—Sb or Bi—In, such that the second alloy controls an interface reaction chemistry with various metallization surface finish materials without interfering with a high temperature performance of the first alloy. The first alloy may have a solidus temperature around 258° C. and at least the first alloy of the first wire and the second alloy of the second wire may be braided together.
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