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Optimization of Spark Plasma Sintering tooling design

: Giuntini, Diletta; Olevsky, Eugene Al; Räthel, Jan; Herrmann, Mathias; Michaelis, Alexander

Bingert, S.R. ; Metal Powder Industries Federation -MPIF-, Princeton/N.J.:
Advances in powder metallurgy & particulate materials 2015 : Proceedings of the 2015 International Conference on Powder Metallurgy & Particulate Materials; PowderMet 2015, May 17-20, MPIF/APMI, San Diego, CD-ROM
Princeton: MPIF, 2015
ISBN: 9781943694013
ISBN: 194369401X
International Conference on Powder Metallurgy & Particulate Materials (PowderMet) <2015, San Diego/Calif.>
Conference Paper
Fraunhofer IKTS ()

A combined experimental and numerical investigation is conducted with the aim of mitigating radial thermal gradients during the Spark Plasma Sintering (SPS) of silicon nitride. Thanks to a double pyrometer experimental setup significant temperature disparities between the overheated edge and the center of the sample are identified, cause of non-uniform density and microstructure in the final product. Finite element methods are employed to reconstruct the conditions experienced by the entire SPS tooling setup and to develop a parametric study with the punch geometry as optimization parameter. A novel punch design is proposed, consisting in the drilling of holes according to a specific pattern, and whose beneficial impact during the SPS processing of insulating powders is experimentally assessed. The tooling optimization strategy here suggested can provide guidelines for the annihilation of temperature in homogeneities in any material system.