Atlas of phase diagrams for solders
Owing to impending
European legislation, lead will no longer be used in the fabrication of
electrical and electronic materials within Europe. COST 531 was a
action on the study of new lead-free materials suitable for use in the
electronics industry. One of the objectives of the action was the
a self-consistent thermodynamic database for lead-free solder materials
substrates. Assessed thermodynamic parameters for more than 50 binary
were collected from the literature or have been provided directly by a
programme of experimental and assessment work as part of the COST
data were supplemented by parameters for ternary systems to provide a
self-consistent thermodynamic database.The database has been tested
using proprietary software to ensure its portability.
This Atlas has been
created using this database in conjunction with commercial software
for the calculation of phase equilibria from critically assessed data.
different software packages were used – MTDATA, ThermoCalc
and PANDAT. Each
package is broadly comparable in scope and can equally be used to
database in order to explore the potential for potential alloys to be
lead free solders. Various diagrams are presented in this volume
with each of these packages. The aim of these diagrams and this volume
firstly to demonstrate the scope and potential of the database, to
the database has been developed as a result of collaboration between a
number of European partners and show how it can be used with
software as an aid in the design and use of solders.
The example below shows a typical example of the
information given for
a binary system
i.e. the source of the critically assessed data, a table of calculated
invariant reactions, the calculated phase diagram and a table of
crystal structures of phases present in the system.