Development of nanoparticle reinforced brazing filler metals and solders: the aspects of downscaling from micro to nanoscale

Vinzenz Bissig ,  Jolanta Janczak-Rusch 

Empa, Materials Technology and Research (Empa), Überlandstrasse 129, Dübendorf 8600, Switzerland

Abstract

The composite approach is used to develop particle reinforced brazing filler metals and solders with tailored properties. For some applications the dimension of the particles and/or the brazing gap thickness has to be downscaled. Especially in case of microjoints, nanoparticles offer a possibility to modify the filler properties within a small volume. The experience gained by the development of composite fillers with microsized particles help by designing the nanocomposite fillers. However, a number of aspects have to be considered when downscaling from micro- to nanoparticle composite solders:
- the processing methods resulting in an uniform distribution of microparticles in a filler metal are do not ensure a homogenous distribution of nanoparticles in this filler (are not directly transferable)
- high specific surface area of nanoparticles increases the particle reactivity and may change the chemical composition of the base filler metal,
- even fine reaction layers (e.g. sub microns region) are in case of nanoparticles sufficient to converse them completely into reaction products,
- with the smaller size of particles added the viscosity of the liquid filer metal may increased by agglomerates of the reinforcement particles
- the “reinforcement” mechanisms differ for the micro- and nanosized particles.
Examples from own research are shown to illustrate these aspects.

 

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium H, by Vinzenz Bissig
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-30 14:52
Revised:   2009-06-07 00:44