The thermodynamic properties of solid cobalt—tin alloys

Cömert, H.; Pratt, J.N.

doi:10.1016/0040-6031(85)85396-x

Cited by 23 publications

(8 citation statements)

References 14 publications

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“…Eremenko et al 15 measured activities of Sn in liquid with Knudsen effusion at 1,573 K. The results were used in the present assessment. The enthalpy for formation of solid alloys was determined by a calorimetric method by Korber and Oelsen 12 and Predel and Vogelbein, 16 by a solid electrolyte galvanic-cell technique by Comert and Pratt,7,11 and estimated by Miedema et al 17 The results are unfortunately quite scattered. The experiment results of CoSn and Co 3 Sn 2 _α by Predel and ogelbein 16 and the experimental results of CoSn 2 by Korber and Oelsen 12 were used in the present assessment.…”

Section: Experimental Datamentioning

confidence: 99%

“…However, and in disagreement with Ishida and Nishizawa 4 and Okamoto, 5 the data obtained by Darby and Jugle 10 was given a low priority because it was found to be contradictory to the phase diagram data of the Co-rich side and the activity data obtained by Comert and Pratt. 11 When analyzing the experimental procedure by Darby and Jugle, 10 one can presume that the error might be caused by the wet chemical analysis. The result of this method is more dependent on the experience of the analyzer than the equipment itself.…”

Section: Experimental Datamentioning

confidence: 99%

“…The activity of Sn at 1,073 K and 1,273 K was measured by a solid electrolyte galvanic-cell technique method by Comert and Pratt. 7,11 It was, however, difficult to fit their activity data for solid-solid equilibrium, and therefore, only their activity data for liquid-solid equilibrium was used for this optimization.…”

Section: Experimental Datamentioning

confidence: 99%

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Thermodynamic assessment of the Sn-Co lead-free solder system

Liu

Andersson

Liu

2004

Journal of Elec Materi

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The Sn-Co-Cu eutectic alloy can be a less expensive alternative for the Sn-Ag-Cu alloy. In order to find the eutectic solder composition of the Sn-Co-Cu system, the Sn-Co binary system has been thoroughly assessed with the calculation of phase diagram (CALPHAD) method. The liquid phase, the FCC and HCP Co-rich solid solution, and the BCT Sn-rich solid solution have been described by the Redlich-Kister model. The Hillert-Jarl-Inden model has been used to describe the magnetic contributions to Gibbs energy in FCC and HCP. The CoSn 2 , CoSn, Co 3 Sn 2 _β, and Co 3 Sn 2 _α phases have been treated as stoichiometric phases. A series of thermodynamic parameters have been obtained. The calculated phase diagram and thermodynamic properties are in good agreement with the experimental data. The obtained thermodynamic data was used to extrapolate the ternary Sn-Co-Cu phase diagram. The composition of the Sn-rich eutectic point of the Sn-Co-Cu system was found to be 224˚C, 0.4% Co, and 0.7% Cu.

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Section: Experimental Datamentioning

confidence: 99%

Section: Experimental Datamentioning

confidence: 99%

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Thermodynamic assessment of the Sn-Co lead-free solder system

Liu

Andersson

Liu

2004

Journal of Elec Materi

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“…The solid solubilities of Sn in a(Co) were determined from results of activity measurements. [2] The congruent reaction L M b À Co 3 Sn 2 happens at 1170°C, and its homogeneous compositions were estimated from activity data. [2] The eutectic reaction L M a(Co) + b À Co 3 Sn 2 is an important reaction in Co-Sn system.…”

Section: Introductionmentioning

confidence: 99%

“…[2] The congruent reaction L M b À Co 3 Sn 2 happens at 1170°C, and its homogeneous compositions were estimated from activity data. [2] The eutectic reaction L M a(Co) + b À Co 3 Sn 2 is an important reaction in Co-Sn system. It has been reported to occur at about 1112°C, of a Sn concentration in the liquid of 20.5 at.% from thermal analysis data and activity measurements.…”

Section: Introductionmentioning

confidence: 99%

Redetermination of the Eutectic Composition of the Co-Sn Binary Alloy

Huang

Liu

et al. 2009

J. Phase Equilib. Diffus.

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A series of Co-Sn alloys was solidified. It was found that the as-cast microstructure of the Co-20.5at.%Sn alloy, which on the basis of literature reports has long been thought to be the eutectic composition, contains much primary phase besides lamellar eutectics. The cooling curve of this alloy contains two exothermic peaks. In contrast, when a Co-24.0at.%Sn alloy was solidified, an entire lamellar eutectic was obtained in the as-cast microstructure. Also, the thermal analyses indicate that there is only one solidification reaction in this alloy. It is suggested that the actual eutectic composition of the Co-Sn system is around Co-24.0at.%Sn, and the corresponding eutectic temperature is about 1385 K.

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Co-Sn (Cobalt-Tin)

Predel¹

Ca-Cd – Co-Zr

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The thermodynamic properties of solid cobalt—tin alloys

Cited by 23 publications

References 14 publications

Thermodynamic assessment of the Sn-Co lead-free solder system

Thermodynamic assessment of the Sn-Co lead-free solder system

Redetermination of the Eutectic Composition of the Co-Sn Binary Alloy

Co-Sn (Cobalt-Tin)

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