Characterization of spark plasma sintered Ag nanopowders

Abstract

The low temperature sintering behaviour of nanocrystalline Ag powder (with an average size of 70 nm) was characterized. Using spark plasma sintering (SPS), the Ag nanopowders can be successfully sintered at low pressure for only 5 min without external heating, and the sintering density increases and porosity decreases significantly with increase in the sintering temperature. Nanoindentation has been used to characterize the SPS sintered Ag samples. The mechanisms of the low sintering temperature behaviour of the nano-Ag powder and the nanoscale mechanical performance have been discussed. Compression tests were also used to characterize the mechanical properties of the sintered Ag sample with a maximum strain up to 15%.

Structural and magnetic properties of self-assembled Sm–Co spherical aggregates

“…On the other hand, the individual Sm-Co nanoparticles coalesce into sub-micron size particles with the annealing treatment ( Fig. 4(b))-as generally observed when nanoparticles are subjected to heat-treatment [26]. The selected area electron diffraction (SAED) patterns shown in Fig.…”

Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials

“…has shown that densication is already possible at temperatures in the 0.24-0.4T m,b range. 56 Sintering can start as soon as the oleic acid preventing direct contact between the ceramic nanoparticles is removed. According to TGA data, most of the organic material is eliminated in the 150-400 C temperature range, with the maximum loss starting at 300 C. 21 Such a wide temperature window for the removal of oleic acid is usually associated with the presence of ligands that are differently bound to the nanoparticles' surface, 57 to the ligands' decomposition or desorption at the surface, 58 and to their high connement in-between the nanoparticles themselves.…”

Nanostructure evolution in joining of Al and Fe nanoparticles with femtosecond laser irradiation

“…23 The overall neck structure is very similar to that seen in the microwave 24 and plasma 25 sintering of metal nanopowders where it has been associated with surface diffusion. 25 In the fs interaction, the electric field is concentrated in the gap between adjacent particles resulting in the emission of electrons from these "hotspots." These energetic electrons are accompanied by spallation as electrons emitted from one particle impact on the other.…”