Effect of Mechanical Activation on Microstructure and Mechanical Properties of Aqueous Colloidal Processed Nickel Metal Matrix Nanocomposites

Abstract:

Previous works studied the colloidal processing of nickel-silica and nickel-titania nanocomposites fabricated via slip casting. A rheological approach was used to characterize and optimize a 30 vol.% nickel aqueous suspension with up to 10 vol.% SiO₂ and 5 vol.% TiO₂ nanoparticles. In this work, the effect of mechanical activation of Ni-SiO₂ and Ni-TiO₂ nanocomposites on microstructural and mechanical properties was studied. For this aim Ni-SiO₂ and Ni TiO₂ slip-cast compacts were attrition milled for up to 12 hours. Green bodies of the mechanical-alloyed powders were obtained by cold pressing (300 MPa). Next, those green bodies were annealed at 700°C for 1 h, repressed at 700 MPa and sintered at 900°C for 1 h in flowing Ar/5%H₂ atmosphere. Porous and dense materials were characterized by SEM/FESEM, Archimedes densities and Vickers microhardness measurements. Mechanical alloying produces a remarkable improvement on microstructure homogenization, sintering densification and hardness comparing with slip-cast composites.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 195-199
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.195
• Online since: August 2012
• Authors: L.E. Vieira, João B. Rodrigues Neto, Aloísio Nelmo Klein, Dachamir Hotza, Rodrigo Moreno
• Keywords: Mechanical Alloying, Nickel, Slip Casting

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DOI: 10.47749/t/unicamp.2019.1089160

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