The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F09%3A00051152" target="_blank" >RIV/00216224:14310/09:00051152 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

čeština

Original language name

The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach

Original language description

The knowledge of the phase diagrams and the predictions of the respective liquidus and solidus temperatures are of a great importance. In the present study, the heat flow differential scanning calorimetry (DSC) was used to describe the phase transformations in the lead-free solder systems Sn-Ag-Cu and Sn-Ag-Cu-X (X=Bi, In). We used the Neztsch STA CD/3/403/5/G instrument that enables for the detection of the DSC signal using the heating and cooling rates of down to 0.1 K/min. At these conditions, the samples could be considered to be in the state close to the thermodynamic equilibrium. The DSC heating signal of the materials consisted of two or more different overlapping peaks resulting from the precipitation of secondary phases. The equilibrium statecalculations were performed using the CALPHAD approach. The individual phases and their molar Gibbs energies were described by the parameters taken from the COST531 Thermodynamic Database of Lead-free Solders [1].

Czech name

The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach

Czech description

The knowledge of the phase diagrams and the predictions of the respective liquidus and solidus temperatures are of a great importance. In the present study, the heat flow differential scanning calorimetry (DSC) was used to describe the phase transformations in the lead-free solder systems Sn-Ag-Cu and Sn-Ag-Cu-X (X=Bi, In). We used the Neztsch STA CD/3/403/5/G instrument that enables for the detection of the DSC signal using the heating and cooling rates of down to 0.1 K/min. At these conditions, the samples could be considered to be in the state close to the thermodynamic equilibrium. The DSC heating signal of the materials consisted of two or more different overlapping peaks resulting from the precipitation of secondary phases. The equilibrium statecalculations were performed using the CALPHAD approach. The individual phases and their molar Gibbs energies were described by the parameters taken from the COST531 Thermodynamic Database of Lead-free Solders [1].

Type

O - Miscellaneous

CEP classification

CF - Physical chemistry and theoretical chemistry

OECD FORD branch

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Project

<a href="/en/project/OC09010" target="_blank" >OC09010: Thermodynamic and Phase Diagram Studies of Systems for High Temperature Lead-Free Solders</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2009

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů