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U.S. Department of Energy
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Pb-free Sn-Ag-Cu ternary eutectic solder

Patent ·
OSTI ID:251113

A Pb-free solder includes a ternary eutectic composition consisting essentially of about 93.6 weight % Sn-about 4.7 weight % Ag-about 1.7 weight % Cu having a eutectic melting temperature of about 217 C and variants of the ternary composition wherein the relative concentrations of Sn, Ag, and Cu deviate from the ternary eutectic composition to provide a controlled melting temperature range (liquid-solid ``mushy`` zone) relative to the eutectic melting temperature (e.g. up to 15 C above the eutectic melting temperature). 5 figs.

Research Organization:
Iowa State University
DOE Contract Number:
W-7405-ENG-82
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States); Sandia Corp., Albuquerque, NM (United States)
Patent Number(s):
US 5,527,628/A/
Application Number:
PAN: 8-394,228
OSTI ID:
251113
Country of Publication:
United States
Language:
English

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