Feasibility, processing properties and thermal behavior of Ni nanopastes produced by ultrasound-enhanced dispersing

Author:B Sattler, S Hausner and G Wagner

Journal:IOP Conference Series: Materials Science and Engineering,1147 (2021) 012011

Abstract:Nickel nanoparticles are materials that can be used for a novel type of joining, so
called nanojoining, as an alternative to conventional brazing. The physical characteristics of
these nano-sized particles lead to a lower melting temperature compared to nickel bulk material
and even lower than typical brazes, without the need for melting point depressants. Such
elements like boron or silicon cause issues due to formation of brittle intermetallic phases. In
order to be able to use Ni nanoparticles in practical applications, they have to be in forms such
as suspensions, e.g pastes. In the present work, therefore, a series of Ni nanopastes is prepared
and investigated with emphasis on the solvent systems. These suspensions consist of Ni
nanoparticles (mean diameter 20 / 90 / 180 / 300 nm) and organic compounds. The examinations
show the feasibility of producing such nanopastes using ultrasound-enhanced dispersing, as well
as margins for adjusting their processing properties. In addition, first results of the thermal
behavior of the Ni nanopastes, measured by simultaneous DSC/TG, are shown