WEB Modelling ceramic microstructure during fast firing by DEMTuesday (22.09.2020) 17:35 - 17:50 M: Modelling and Simulation 1 Part of:
Sintering is a processing operation in powder metallurgy involving the consolidation of powder particles into a solid structure. Fast firing has been used to produce relatively dense ceramics in periods of time as short as 5 min. High heat inputs during fast firing originate changes in the internal structure of the ceramic compact. Due to the refractoriness of ceramics, the high heating rate, and the short dwell time, most of the densification in fast fired materials occurs when the sample is under non-isothermal conditions.
Despite the significant progress achieved in the measuring techniques of sintering and heat transfer, it has proved extremely challenging to fully understand the sintering process and heat transfer characteristics of particulate systems via the experimental approach. For this reason, the numerical approach based on Discrete Element Method (DEM) has become increasingly popular as it provides detailed local and transient information on flow and heat transfer at the particle scale as well as analyzing mechanisms and properties that cannot be measured by continuum mechanical methods or is hard to obtain experimentally.
Despite significant efforts to model the sintering process by DEM, the approaches available in the literature consider only isothermal sintering. This work proposes to extend Parhami & McMeeking  contact model to describe non-isothermal sintering of ceramics. The heat transfer and thermal gradients inside the ceramic sample were modelled through the process of fast firing in order to predict microstructure and density changes induced by the fast furnace’s heat transfer.
 F. Parhami and R. M. McMeeking, “A network model for initial stage sintering,” Mech. Mater., vol. 27, no. 2, pp. 111–124, 1998, doi: 10.1016/S0167-6636(97)00034-3.
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