Detailed Information on Publication Record
2009
The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach
SOPOUŠEK, Jiří and Marian PALCUTBasic information
Original name
The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach
Name in Czech
Interpretace DSC signálů pájek bez olova za použití metody CALPHAD
Name (in English)
The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach
Authors
SOPOUŠEK, Jiří (203 Czech Republic, guarantor, belonging to the institution) and Marian PALCUT (703 Slovakia)
Edition
CALPHAD XXXVIII (May 17-22, 2009), 2009
Other information
Language
Czech
Type of outcome
Konferenční abstrakt
Field of Study
10403 Physical chemistry
Country of publisher
Slovakia
Confidentiality degree
není předmětem státního či obchodního tajemství
RIV identification code
RIV/00216224:14310/09:00051152
Organization unit
Faculty of Science
Keywords (in Czech)
CALPHAD; termická analýza; bez olova; fázové diagramy
Keywords in English
CALPHAD; thermal analysis; lead-free; phase diagram
Tags
Tags
International impact
Změněno: 7/2/2012 09:14, prof. RNDr. Jiří Sopoušek, CSc.
V originále
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 state calculations 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]. Since the CALPHAD approach allows for the calculation of thermodynamic functions, the experimental DSC curves could be simulated using the calculated molar enthalpies of the solders (deltaH). The standard molar enthalpies were calculated for different temperatures and for the various lead-free alloys. The respective temperature derivatives were directly and successfully compared with the experimental DSC curves.
In English
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 state calculations 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]. Since the CALPHAD approach allows for the calculation of thermodynamic functions, the experimental DSC curves could be simulated using the calculated molar enthalpies of the solders (deltaH). The standard molar enthalpies were calculated for different temperatures and for the various lead-free alloys. The respective temperature derivatives were directly and successfully compared with the experimental DSC curves.
Links
| MSM0021622410, plan (intention) |
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| OC09010, research and development project |
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