Modeling a material from packing, through sintering and to the final microstructural properties

Rasmus Bjørk, Kaspar Kirstein Nielsen

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Abstract

We present a combination of numerical models that can together simulate the initial packing of particles, followed by sintering and finally the resulting microstructural properties. For the latter we here focus on the magnetism of a sintered sample, and the associated coupling between heat and magnetism known as the magnetocaloric effect. We present a 3-dimensional time-dependent numerical model that spatially resolves samples down to the grain size, and includes the demagnetizing field, chemical inhomogeneity realized as a spatial variation of Curie temperature across the sample, local hysteresis and heat transfer. We can thus model how particle size, packing, sintering and chemical inhomogeneity affect the observed properties of magnetocaloric samples. For example, we show that even a modest distribution in Curie temperature (TC) across the sample results in a significant broadening and lowering of the total entropy change of the sample around TC. We discuss how clustering of grains with similar values of TC across the sample influences the results.
Original languageEnglish
Publication date2017
Number of pages1
Publication statusPublished - 2017
EventInternational Conference on Sintering 2017 - San Diego, California, United States
Duration: 12 Nov 201716 Nov 2017
http://ceramics.org/international-conference-on-sintering-2017

Conference

ConferenceInternational Conference on Sintering 2017
Country/TerritoryUnited States
CitySan Diego, California
Period12/11/201716/11/2017
Internet address

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