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1 Technion - Israel Institute of Technology Haifa 2 CIRIMAT - Centre interuniversitaire de recherche et d-ingenierie des matériaux

Abstract : 2014AbstractYttrium aluminum garnet YAG nano-particles were spark plasma sintered between 1100◦C and 1400◦C under 2–100 MPa pressure withoutisothermal treatments. The span of relative density between 48% and 99% enabled microstructural examination at different stages of the densification.Electron microscopy examination showed material jets with amorphous character connecting between the spherical nano-particles, which wererelated to surface melting. Aligned nano-particles within the nano-clusters, apparently affected by high local electric fields, were observed inthe partially dense microstructure. Rapid densification from 1200◦C was related to densification by nano-particle sliding and rotation assistedby surface softening. The observed microstructural features were discussed with respect to sparking and plasma formation during the SPS. Theoccurrence of plasma was explained by means of the plasma formation- plastic deformation diagram.

Keywords : Plasma Spark plasma sintering Densification Powder consolidation YAG





Autor: Rachel Marder - Claude Estournès - Geoffroy Chevallier - Rachman Chaim -

Fuente: https://hal.archives-ouvertes.fr/



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