研究目的
To investigate the impact of the Peltier effect on the temperature field during spark plasma sintering of thermoelectric materials using finite element method simulation.
研究成果
The Peltier effect significantly contributes to temperature inhomogeneities during SPS of thermoelectric materials, with vertical temperature differences being 2-3 times higher than radial ones. Electrical insulation at interfaces can reduce DTs by 59-92%, but this may suppress other SPS-specific effects, requiring further investigation.
研究不足
The model did not include sample shrinkage, porosity changes, or the cooling stage of SPS. Contact resistances were neglected, and the study was limited to numerical simulation without experimental validation for all materials.
1：Experimental Design and Method Selection:
The study used finite element method (FEM) simulation in Comsol Multiphysics software to model the spark plasma sintering (SPS) process, focusing on heat transfer and electric currents with multiphysical interfaces for Joule heating and thermoelectric effect.
2：Sample Selection and Data Sources:
A line of thermoelectric materials (e.g., Zn4Sb3, Bi2Te3-Sb2Te3, PbSe
3：5Te5, Mg2Si, FeNbSb, InCo4Sb12, Mg2Si-Mg2Sn, Si-Ge) was selected, with properties sourced from literature references. Graphite properties were measured at NUST "MISiS", Moscow. List of Experimental Equipment and Materials:
The setup included graphite plungers, steel electrodes, and insulating inserts (e.g., mica foil) for some simulations. No specific brands or models were mentioned.
4：Experimental Procedures and Operational Workflow:
The simulation considered the first two stages of SPS (powder treatment and consolidated compact dwell), with time-dependent normal current density applied. Electrical and thermal contact resistances were neglected.
5：Data Analysis Methods:
Temperature differences (DTs) were calculated as the difference between minimum and maximum sintering temperatures in the sample volume, with analysis of radial and vertical gradients.
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