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

SOPOUŠEK, Jiří a Marian PALCUT. The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach. In CALPHAD XXXVIII (May 17-22, 2009). 2009.

Základní údaje

• Originální název: The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach
• Název česky: Interpretace DSC signálů pájek bez olova za použití metody CALPHAD
• Název anglicky: The interpretation of the DSC signals of the lead-free solder alloy systems using the CALPHAD approach
• Autoři: SOPOUŠEK, Jiří (203 Česká republika, garant, domácí) a Marian PALCUT (703 Slovensko).
• Vydání: CALPHAD XXXVIII (May 17-22, 2009), 2009.

Další údaje

• Originální jazyk: čeština
• Typ výsledku: Konferenční abstrakt
• Obor: 10403 Physical chemistry
• Stát vydavatele: Slovensko
• Utajení: není předmětem státního či obchodního tajemství
• Kód RIV: RIV/00216224:14310/09:00051152
• Organizační jednotka: Přírodovědecká fakulta
• Klíčová slova česky: CALPHAD; termická analýza; bez olova; fázové diagramy
• Klíčová slova anglicky: CALPHAD; thermal analysis; lead-free; phase diagram
• Štítky: CALPHAD, IK, lead-free, Phase diagram, rivok, Thermal analysis
• Příznaky: Mezinárodní význam

Anotace

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.

Anotace anglicky

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.

Návaznosti

• MSM0021622410, záměr: Název: Fyzikální a chemické vlastnosti pokročilých materiálů a struktur

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Fyzikální a chemické vlastnosti pokročilých materiálů a struktur

• OC09010, projekt VaV: Název: Studium termodynamických vlastností a fázových diagramů soustav pro vysokoteplotní bezolovnaté pájky

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Studium termodynamických vlastností a fázových diagramů soustav pro vysokoteplotní bezolovnaté pájky