Abstract
Sintering granular materials involves the application of pressure and temperature to make the particulate material a permanent solid. In order to better understand this complex process, the pressure-, temperature-, and time-dependent contact behaviour of micron-sized particles has been studied in close collaboration by the groups of Luding, Staedler and Kappl within the DFG SPP PiKo. This chapter summarises the modelling advances made during the project, with direct links given to the experimental results. Two aspects have been studied: (a) the dependence of the elastic as well as frictional contact forces and torques on an applied normal pressure; and (b) the formation and evolution of adhesive bonds between particles during heat-sintering. Both contact models have been experimentally calibrated and validated, using advanced techniques such as nanoindentation and AFM. As materials, borosilicate particles were used to study the pressure-dependency, while polystyrene particles were chosen due to their low glass transition temperature to study the temperature-dependency near the transition. Combining both aspects provides a multi-purpose contact model that allows the simulations of a wide range of sinter and agglomeration processes for a variety of practically relevant materials.
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Acknowledgements
This work was carried out within the framework of the Key Research Program (SPP 1486 PiKo “Particles in Contact”) grants LU 450/10, STA 1021/1 and KA 1724/1. The authors would like to thank the German Research Foundation (DFG) for their financial support during the SPP. The numerical simulations in this paper were carried out using the open-source code MercuryDPM [46, 53, 54], available via http://mercurydpm.org. This SPP and our research would not have been possible without Professor Tomas, who initiated the SPP, but sadly died and thus could not accompany us to the successful ending of the projects; we miss him and his inspirations about particles in contact very much. Special thanks also to Professor Antonyuk who led the SPP successfully to the end, as reflected by this book.
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Weinhart, T., Fuchs, R., Staedler, T., Kappl, M., Luding, S. (2019). Sintering—Pressure- and Temperature-Dependent Contact Models. In: Antonyuk, S. (eds) Particles in Contact. Springer, Cham. https://doi.org/10.1007/978-3-030-15899-6_10
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