Published September 24, 2024
| Version v1
Publication
Set-Up of Amorphous Powder Sintering Process by Means of Electrical Discharge of Capacitors
Description
The technique of sintering by electrical discharge of capacitors (SEDC)
is investigated, using a commercial stud welding equipment adapted to be used
in the sintering of amorphous powders. In this technique, pressure and the heat
generated by the Joule effect from the high intensity electric current are applied
simultaneously to a mass of powder. The use of this technique lies in its speed, in
order to be able to maintain the initial structure of the powders. For the set-up of
the equipment, it is analyzed how successive discharges affect, depending on the
starting particle size, the porosity, microstructure, microhardness and resistivity
of compacts generated from Metglas powders. It will be shown how successive
discharges lead to improved sintering. Thus, starting from an initial porosity of
0.35, with powders of 64 µm, the porosity after the first 5 discharges decreases to
0.05 and after 35 discharges the final porosity decreases to 0.008. After sintering,
these compacts reach microhardness values of up to 865 HV1 and the electrical
resistivity of the powder mass decreases from 2.94 × 10⁻⁵ to 7.78 × 10⁻⁷ Ώ-m.
Additional details
Identifiers
- URL
- https://idus.us.es/handle//11441/162795
- URN
- urn:oai:idus.us.es:11441/162795