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Elaboration, compactage et frittage de poudres amorphes chimiques NiP

Abstract : We have elaborated five powders of NiP with 8% at P et 17% at P. The chemical and physical parameters are kept constant except concentration of phosphorus into bath. The powders obtained with this new technique are identified amorphous with X rays. We have tried to caracterize behaviour of different powder during uniaxial compacting stage. There are two stages during compaction, the first one for low pressure compacting (300 à 600 MPa) when the aprticles of powder undergo arrangement, second stage for high pressure was attributed to the plastic deformation of powder particles. Stereology made it possible to caracterize internal structure, to describe behaviour, physics and mechanics properties of conglomerate of powder compacted till ultimate of sinttering. During temperature rising, we have attained 95% of theorical density for all compacted at high pressure. We could bring to the fore one transition of amorphous-crystal phase at 300°C with measurements of electrical resistivity for all compacted, second transition became visible at 500°C for powder at 12% at P and 17% at P who cristalization it made of two stages, precipitation of Ni then Ni3P and growth within material. Vickers Microhardness and Young module evolved well with rising temperature
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Mohammed Saadi. Elaboration, compactage et frittage de poudres amorphes chimiques NiP. Sciences de l'ingénieur [physics]. Université Paul Verlaine - Metz, 1996. Français. ⟨NNT : 1996METZ048S⟩. ⟨tel-01777168⟩



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