A new scientific device for the simultaneous determination of temperature dependent thermal properties: thermal diffusivity, heat conductivity and heat capacity
Physical Chemistry of Solids and Surfaces, Material Characterisation
Final Report Abstract
In the project a new scientific device is developed that is capable of measuring the main thermal properties heat conductivity and thermal diffusivity within a single experimental cycle as a function of temperature. Principle of the method is to evaluate temperature distributions along a sample that is subjected to a steep temperature gradient in stationary and transient states. A cylindrical sample is heated at one side using induction heating and cooled at the other side using cooling water streaming in a laminar manner. A one dimensional heat flow through the sample is ensured using the at present best available thermal insulator (aerogel). The heat flow is quantified by measuring the temperatures in the cooling water in front of and behind the sample. The temperature distributions along the samples are measured optically with highest possible precision during heating, the stationary state and cooling using a modern infrared camera (phonon detector). The numerous temperature profiles recorded during heating and cooling are analyzed using a numerical inverse method that solves the heat equation and yields the temperature dependent thermal diffusivity. The stationary state is used to determine the temperature dependent heat conductivity by employing Fourier’s law. Employing the new method allows thermal characterization with the same accuracy as standard methods using two devices, but with a drastically reduced effort with respect to experimental time by up to two orders of magnitude. The reduced effort renders systematic studies of complex alloy systems possible.
Publications
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„Key data for modeling thermal properties” FEM 2019, Schwäbisch Gmünd
M. Rettenmayr & S. Lippmann
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„Methode zur raschen und vollständigen Bestimmung von temperaturabhängigen thermischen Eigenschaften“ Thüringer Werkstofftag 2019, TU Ilmenau
A. Zimare, M. Rettenmayr & S. Lippmann
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Bridging the gap between high temperature and low temperature oxidation of 316 L. Corrosion Science, 175, 108884.
Wonneberger, Robert; Lippmann, Stephanie; Abendroth, Barbara; Carlsson, Anna; Seyring, Martin; Rettenmayr, Markus & Undisz, Andreas
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“Determining the Curie temperature of Ni using a temperature gradient evaluation method as feasibility study for a new measurement method of thermal conductivity and diffusivity“ Thermydynamics of Alloys (TOFA) 2020, Kloster Banz
S. Wilhelmy, A. Zimare, Q. Zhang, M. Rettenmayr & S. Lippmann
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A temperature gradient evaluation method for determining temperature dependent thermal conductivities. Measurement Science and Technology, 32(10), 105601.
Wilhelmy, Sönke; Zimare, Anton; Lippmann, Stephanie & Rettenmayr, Markus
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Measurement of the Curie temperature based on temperature dependent thermal properties. International Communications in Heat and Mass Transfer, 124, 105239.
Wilhelmy, S.; Zimare, A.; Zhang, Q.; Rettenmayr, M. & Lippmann, S.
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Specific heat capacity of the intermetallics ε-Cu3Sn, η/η′-Cu6Sn5, Al3Ni and Al3Ni2. Calphad, 74, 102294.
Saenko, Ivan; Engelhardt, Hannes; Hornig, Philipp; Fabrichnaya, Olga & Lippmann, Stephanie
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“Temperature gradients for characterizing intermetallics”, Intermetallics 2021, Kloster Banz
S. Lippmann & M. Rettenmayr
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Formation of a nanoscale two-phase microstructure in Cu–Zn( Al) samples with macroscopic concentration gradient. Materials Characterization, 192, 112229.
Walnsch, Alexander; Kaaden, Tobias; Fischer, Peter D.B.; Motylenko, Mykhaylo; Seyring, Martin; Leineweber, Andreas & Lippmann, Stephanie
