Hamburg 2001 – wissenschaftliches Programm

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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