A powder body model has been developed to study mass transfer through movement of the material as sliding blocks (packs) simulating particles and grains in polycrystals. The key model parameters are grain size and mobility of intergranular boundary layers. The theoretical analysis has resulted in mathematical relations showing that transfer of the material to fill the pores intensifies with transition to finer grains (subgrains, particles) and with higher mobility of the material in boundary layers between the grains. The boundaries between grains and particles experience greater heating during electric current sintering. Temperature in the boundary zone remains higher than the area far from the boundaries, consequently leading to greater mobility of the material. This improves intergranular slip and promotes fast and ultrafast shrinkage.
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Translated from Poroshkovaya Metallurgiya, Nos. 9–10 (505), pp. 23–34, 2015.
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Raichenko, A.I. Electric Current Activated Sintering of Porous Powder Compacts. Powder Metall Met Ceram 54, 525–533 (2016). https://doi.org/10.1007/s11106-016-9745-8
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DOI: https://doi.org/10.1007/s11106-016-9745-8