• Document: The COST 531 lead-free solders database: An instructive example for the creation of a thermodynamic database
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The COST 531 lead-free solders database: An instructive example for the creation of a thermodynamic database Alan Dinsdale NPL Materials Centre National Physical Laboratory Teddington, UK ThermoCalc User Group Meeting, ACCESS, Aachen 27-28 September 2007 Monday, 29 October 2007 COST531 database managed by: • Aleš Kroupa • Adéla Zemanová • Jan Vreštál • Jirí Vízdal • Andy Watson • Alan Dinsdale 2 Monday, 29 October 2007 Outline • The need for Lead free solders • COST (COST531 and MP0602) • Thermodynamic database for lead free solders • Scope and Standards • Need for consistency • Applications • How you can access the database • Conclusions 3 Monday, 29 October 2007 The need for Lead free solders 4 Monday, 29 October 2007 The need for Lead-free Solders The lead-tin system 400 400 • Traditional solder ƒ Pb-Sn 350 350 LIQUID ƒ Electrician’s solder (tinman’s 300 300 solder) ƒ Eutectic Composition T /degCC 250 250 ƒ Rapid solidification T /deg FCC_A1 ƒ Plumber’s solder 200 200 ƒ ~Pb:Sn 2:1 150 150 ƒ Large solidification range ƒ Pasty range 100 100 ƒ High-temperature solders FCC_A1+BCT_A5 50 ƒ (under-bonnet 50 0 0.0 0.1 0.1 0.2 0.2 0.3 0.3 0.4 0.4 0.5 0.5 0.6 0.6 0.7 0.7 0.8 0.8 0.9 0.9 1 1.0 applications) Pb x(Sn)x(Sn) Sn 5 Monday, 29 October 2007 Problems with Lead • Environmental issues ƒ Toxic ƒ Incorporated into bone marrow, nerve tissue, brain, kidneys.. ƒ Low levels affect the brain, central nervous system, lead to learning difficulties in children, impair physical and mental development ƒ Disposal of electrical and electronic equipment ƒ Lead leaching into groundwater from landfill ƒ European legislation ƒ Waste Electrical and Electronic Equipment (WEEE) Directive ƒ Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2006 (RoHS) – 1st July 2006 ƒ Need for coordinated European research in support of European industry 6

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