A calorimetric study of thermodynamic properties for binary Cu–Ge alloys

Zhai, Wei; Geng, D. L.; Wang, W.L.; Wei, B.

doi:10.1016/j.jallcom.2012.04.091

Cited by 9 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latent heat were estimated as 232.8, 198.2, and 163.5 kJ/kg for CuGe40, CuGe50, and CuGe60, respectively. The value of latent heat for CuGe40 is comparable to reference data (169.7 kJ/kg) (Zhai et al, 2012). Additionally, the heat storage density of CuGe50 increased in the temperature range 644-705°C owing to the latent heat from the primary Ge and sensible heat from the eutectic mixture, while the heat storage density of CuGe60 is enhanced in the temperature range 644-765°C.…”

Section: Thermal Storage Performancesupporting

confidence: 81%

“…There is a paucity of studies on the values of the specific heat (C p ) based on the temperature and thermophysical properties of the Cu-Ge alloy. The phase transition temperatures and enthalpy of fusion for Cu-Ge alloys with a wide range of chemical compositions have been examined (Zhai et al, 2012). In this study, the melting, solidification, and eutectic temperatures, enthalpies, and specific heat capacity of the alloys were measured using differential scanning calorimetry [DSC, NETZSCH DSC 404 F3 Pegasus ® manufactured by NETZSCH Co. Ltd., temperature resolution of ±0.0025 × |t|°C)] under an Ar flow of 100 ml/min with a heating and cooling rate of 10°C/min between room temperature and 900°C.…”

Section: Thermo-physical Properties At High Temperaturesmentioning

confidence: 99%

“…The latent heat were estimated as 41.8, 27.3, and 23.2 kJ/kg for CuGe40, CuGe50, and CuGe60, respectively. The value of latent heat for CuGe40 was estimated by reference data (28.4 kJ/kg) (Zhai et al, 2012). Strong discontinuous changes are the sum of sensible heat and latent heat released/stored in the solid/liquid phase transition (eutectic mixture of ε 2 + (Ge) 5 liquid phase) at a temperature of 644°C.…”

Section: Thermal Storage Performancementioning

confidence: 99%

“…Si and Ge elements belong to the carbon group in the periodic table, in which the Cu-Ge alloy has a eutectic mixture containing Ge contents that may lead to a small volume change during the phase change. In addition, data available for thermo-physical properties of the Cu-Ge alloy is limited (Zhai et al, 2012). Similarly, there remains a dearth of information on the expected thermal response and consistence with the phase diagram based on the thermodynamic equilibrium, and favorable eutectic and liquefaction temperatures for TES in the net-generation CSP.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phase Change Material of Copper–Germanium Alloy as Solar Latent Heat Storage at High Temperatures

et al. 2021

View full text Add to dashboard Cite

A copper–germanium alloy (Cu–Ge alloy) was examined as a phase change material, at temperatures exceeding 600°C, for latent heat storage in solar thermal applications. First, the thermo-physical properties of the Cu–Ge alloy were examined using differential scanning calorimetry, thermomechanical analysis, and laser flash analysis. Second, to evaluate the thermal response and reliability of the Cu–Ge alloy, the cyclic properties of thermal charge/discharge were examined under various thermal conditions. The alloys obtained after the tests were examined for their chemical compatibility with the stainless steel container using an electron probe micro analyzer. The elemental distribution of each Cu–Ge alloy was evaluated using cyclic performance tests. Finally, the chemical compatibility of the Cu–Ge alloy was evaluated using a high-temperature test with candidate materials of a phase change material container vessel [stainless steel (SUS310S), Inconel625, silicon carbide (SiC), and alumina (Al2O3)]. The Cu–Ge alloy exhibited significant potential as a latent heat storage material in next-generation solar thermal power plants because it demonstrates various advantages, including a superior storage capacity at a temperature of 644°C, temperature coherence to the phase diagram, a quick thermal response, satisfactory cyclic behavior of charge/discharge modes, a thermodynamically stable metallographic structure, and non-reactivity with container ceramic materials (SiC and Al2O3).

show abstract

Section: Thermal Storage Performancesupporting

confidence: 81%

Section: Thermo-physical Properties At High Temperaturesmentioning

confidence: 99%

Section: Thermal Storage Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Change Material of Copper–Germanium Alloy as Solar Latent Heat Storage at High Temperatures

et al. 2021

View full text Add to dashboard Cite

show abstract

“…If better calorimetric data are not available, the NKR is nowadays a standard method for constructing phase diagrams (e.g., within the CALPHAD approach) of multicomponent alloys, despite the fact that changes in the electronic structure due to the formation of compounds from the constituents are not taken into account. Besides its usual application to estimate heat capacities, equations similar to Equation ( 7 ) have also been applied to other thermodynamic quantities including the enthalpies of fusion [ 74 ], Gibbs free energy [ 75 ] and entropies of formations [ 76 ] of various compounds.…”

Section: Results and Discussionmentioning

confidence: 99%

A Combined Experimental and First-Principles Based Assessment of Finite-Temperature Thermodynamic Properties of Intermetallic Al3Sc

et al. 2021

View full text Add to dashboard Cite

We present a first-principles assessment of the finite-temperature thermodynamic properties of the intermetallic Al3Sc phase including the complete spectrum of excitations and compare the theoretical findings with our dilatometric and calorimetric measurements. While significant electronic contributions to the heat capacity and thermal expansion are observed near the melting temperature, anharmonic contributions, and electron–phonon coupling effects are found to be relatively small. On the one hand, these accurate methods are used to demonstrate shortcomings of empirical predictions of phase stabilities such as the Neumann–Kopp rule. On the other hand, their combination with elasticity theory was found to provide an upper limit for the size of Al3Sc nanoprecipitates needed to maintain coherency with the host matrix. The chemo-mechanical coupling being responsible for the coherency loss of strengthening precipitates is revealed by a combination of state-of-the-art simulations and dedicated experiments. These findings can be exploited to fine-tune the microstructure of Al-Sc-based alloys to approach optimum mechanical properties.

show abstract

Physical simulation of investment casting for GTD-222 Ni-based superalloy processed by controlled cooling rates

Wang

et al. 2019

Int J Adv Manuf Technol

View full text Add to dashboard Cite

A calorimetric study of thermodynamic properties for binary Cu–Ge alloys

Cited by 9 publications

References 32 publications

Phase Change Material of Copper–Germanium Alloy as Solar Latent Heat Storage at High Temperatures

Phase Change Material of Copper–Germanium Alloy as Solar Latent Heat Storage at High Temperatures

A Combined Experimental and First-Principles Based Assessment of Finite-Temperature Thermodynamic Properties of Intermetallic Al3Sc

Physical simulation of investment casting for GTD-222 Ni-based superalloy processed by controlled cooling rates

Contact Info

Product

Resources

About