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Article Dans Une Revue Journal of the European Ceramic Society Année : 2023

Two-step sintering of alumina nano-powders: A discrete element study

Résumé

Avoiding grain growth during sintering of ceramic nano-powders is of great technological interest. Although two-step sintering is an effective technique to achieve this goal, the mechanisms at play are not well understood. This study adapts our previous discrete model to investigate the conventional and two-step sintering of large nano-powder packings. The densification and grain growth results agree qualitatively well with experimental data on alumina. Simulations confirm that faster heating rates retard grain growth in conventional sintering of nano-alumina. Our results support the hypothesis that the success of nano-alumina two-step sintering relies on the sharp increase in the activation energy of the grain boundary mobility at low temperatures. Simulations indicate a transition temperature of 1100 • C and that at least a 2.5-fold increase in activation energy is required to explain the suppression of grain growth. The relative weights of surface diffusion and of grain boundary motion for grain growth are clarified.
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Dates et versions

hal-03904166 , version 1 (16-12-2022)
hal-03904166 , version 2 (29-09-2023)

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Brayan Paredes-Goyes, Aatreya Manjulagiri Venkatesh, David Jauffrès, Christophe L. Martin. Two-step sintering of alumina nano-powders: A discrete element study. Journal of the European Ceramic Society, 2023, 43 (2), pp.501-509. ⟨10.1016/j.jeurceramsoc.2022.10.001⟩. ⟨hal-03904166v2⟩
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