Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
M: Metallphysik
M 26: Wasserstoff in Metallen II
M 26.6: Fachvortrag
Mittwoch, 28. März 2001, 18:30–18:45, S12
Extraction of boron from Fe80B20 by annealing under hydrogen flow — •Gabriela David, Stefan Roth, Jürgen Eckert, and Ludwig Schultz — IFW - Dresden, Insitut für Metallische Werkstoffe, PF 27 01 16, 01171 Dresden
Boron was extracted from initially amorphous Fe80B20
ribbons by
annealing in flowing hydrogen atmosphere. The extraction of
boron is caused by gas-solid reactions. It is controlled by
diffusion and chemical reactions and starts from the surface
of the ribbon. Thermogravimetrical measurements (TG) made at
three different heating rates permit a thermokinetic description
of the extraction process within a model with four reactions
(adsorption of hydrogen, dissociation of iron boride, diffusion,
and desorption of boran). The simulation of the
thermogravimetrical measurements makes possible a better
understanding of the extraction with its dependences and limits.
Boron may be extracted from Fe-B-ribbons practically completely.
It is possible to prepare a Co foil by a similar procedure from
Co-B-amorphous ribbons.
Keywords: Rapid solidification; Reactive annealing;
Simulation; Fe-B alloys