Computational-friendly analytical model of electrical current pulse pattern in a spark plasma sintering device (original) (raw)
2019, Applied Mathematical Modelling
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Pulse analysis and electric contact measurements in spark plasma sintering
In order to model the current density distribution and the temperature changes of the tools used during a spark-plasma-sintering (SPS) cycle, the variation of the power delivered by an SPS machine and the graphite-Papyex ® -graphite electrical contacts were studied experimentally. The electric device was also characterized; in particular current pulse characteristics and their behavior with time were studied in various conditions of temperature, pulses sequences, materials and total electric power dissipated. It is well known that the performance of an electric contact is dependent on the applied pressure and the temperature. First, by varying the pressure during the SPS cycle the effect of the electric contacts is clearly seen. Secondly, in order to determine the behavior of such contacts experimentally over a pressure range of 10-50 MPa and temperatures of 50-800 • C, a Doehlert experimental design was used.
Numerical Modelling of Thermal-Electrical Phenomena in Spark Plasma Sintering
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Spark Plasma Sintering belongs to a class of sintering techniques that employs electric current to assist compaction. The present paper addresses the numerical modelling of the coupled electrical and thermal problems. Numerical simulations are carried out for two samples (TiAl and alumina). The distribution of electric current and temperature are shown in the specimen as well as in the tooling, providing a better understanding of the SPS.
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