Development of high melting point, environmentally friendly solders, using the calphad approach

• Autorzy: Chidambaram V. , Hald J. , Hattel J.

Warianty tytułu

PL

Projektowanie wysokotemperaturowych, przyjaznych dla środowiska lutów przy pomocy metody calphad

• Konferencja: "Discussion Meeting on Thermodynamics of Alloys - TOFA 2008" (June 22-27, 2008; Kraków, Poland)
• Języki publikacji: EN

Abstrakty

EN

An attempt has been madę using the CALPHAD approach via Thermo-Calc to explore the various possible chemical compositions that adhere to the melting criterion i.e. 270-350°C, reąuired to replace the traditionally used high lead content solders for first level packaging applications. Various temary combinations were extrapolated iteratively from well assessed binary systems using the COST 531 (version 2) and SSOL2 thermodynamic databases. The ternary combinations that met the solidification reąuirement were optimized for a narrow solidification rangę. Taking advantage of the CALPHAD approach meaning that Scheil's eąuation could now be applied to multicomponent alloys in a morę efficient way than the traditional; the optimized ternary compositions were subjected to non-equilibrium solidification simulations. Effort has also been madę to predict the phase fractions during solidification of promising solder alloy candidates. The ternary combinations that satisfied the primary solidification reąuirement were scrutinized taking into account the commercial interests i.e. availability, cost-effectiveness, recyclability and toxicity issues. Technical issues like manufacturability and surface tension have also been considered. Special focus has been given to toxicity related issues sińce the main ideology of looking for an alternative to high lead containing solders is not related to technical issues but due to environmental concerns.

PL

Przy pomocy metody CALPHAD, używając pakietu ThermoCalc, dokonano próby wytypowania bezołowiowych stopów trójskładnikowych, o temperaturze topnienia 270-350°C, jako zamienników lutów wysokoołowiowych, stosowanych do wstępnego montażu układów elektronicznych. Rozpatrzono różne typy stopów z bazy danych COST 531, wersja 2, oraz bazy SSOL2 dobierając te o najmniejszej różnicy temperatur solidus-likwidus. Dla tak dobranych stopów wykonano następnie symulację krzepnięcia równowagowego i symulację z zastosowaniem modelu Scheila. Na podstawie otrzymanych ścieżek krzepnięcia próbowano przewidzieć skład fazowy stopów przy obydwu rodzajach krzepnięcia. Grupa wybranych stopów była dalej oceniana z punktu widzenia technicznego, ekonomicznego i ekologicznego ze szczególnym uwzględnieniem tego ostatniego.

Słowa kluczowe

EN

CALPHAD; COST 531 (solder database); SSOL2 (solution database)

PL

CALPHAD; baza danych COST 531; baza danych SSOL2

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2008
• Tom: Vol. 53, iss. 4
• Strony: 1111--1118
• Opis fizyczny: Bibliogr. 24 poz., rys., tab.

Twórcy

autor

Chidambaram V.

autor

Hald J.

autor

Hattel J.

• DEPARTMENT OF MECHANICAL ENGINEERING, DENMARK TECHNICAL UNIVERSITY, BUILDING 425, LYNGBY, DK-2800, DENMARK

Bibliografia

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