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Highlight Lecture

Solid State Sintering: A Phase-field approach

Thursday (27.09.2018)
12:30 - 12:45 S1/03 - 223
Part of:

The production of tailored ceramics, with defined properties for technical applications, requires a broad knowledge about the sintering process.

Especially the evolving microstructure during the sintering process determines the final properties.

The densification and coarsening of the microstructure in the green body during sintering is directly affected by the dominating diffusion mechanisms, volume, surface and grain boundary diffusion.

Due to the complex interplay of the material and process parameters, it is challenging to predict the microstructure evolution in ceramic compounds.

In this talk, a phase-field model is presented to investigate the microstructure evolution during solid state sintering.

The model is based on the grand potential approach and considers different diffusion mechanisms.

To efficiently investigate realistic green bodies with multiple thousand particles, the model is implemented in a highly optimized manner in the massive parallel phase-field solver framework PACE3D.

In the first part of this talk, the effects of the different diffusion mechanisms on the microstructure evolution for two and four particle settings are validated.

In the second part, the densification and grain growth depending on the active diffusion mechanisms is investigated using realistic green bodies in large scale simulations with up to 20000 grains.

Depending on the diffusion mechanisms, the evolution of stable isolated pores in the microstructure is investigated.

Dr. Johannes Hötzer
Karlsruhe University of Applied Sciences
Additional Authors:
  • Marco Seiz
    Karlsruhe Institute of Technology (KIT)
  • Michael Kellner
    Karlsruhe Institute of Technology (KIT)
  • Prof. Dr. Wolfgang Rheinheimer
    Purdue University
  • Prof. Dr. Britta Nestler
    Karlsruhe Institute of Technology (KIT)