Über die Verwendung von Borverbindungen in gasgekühlten Hochtemperaturreaktoren 1: Bestimmung des thermischen Verhaltens von Bor in Graphit mit Hilfe der Emissionsspektroskopie
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Media type:
E-Book;
Report
Title:
Über die Verwendung von Borverbindungen in gasgekühlten Hochtemperaturreaktoren 1: Bestimmung des thermischen Verhaltens von Bor in Graphit mit Hilfe der Emissionsspektroskopie
Published in:Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Berichte der Kernforschungsanlage Jülich 477, 18 p. (1967).
Language:
German
Origination:
Footnote:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Description:
In high-temperature gas-cooled reactor technology the use of graphite elements containing boron compounds as absorber materials or burnable poisons is given more and more attention. This means that the relevant properties of those compounds such as their stability in a graphite matrix at high temperature have tobe known. The present part of this work deals with the thermal behaviour of boron and boron carbide in graphite when heated in a d.c. arc between graphite electrodes. lt has been shown by emission spectroscopy that in boron containing graphite electrodes the boron migrates always towards the hottest spot. The rate of this migration depends on the nature of the boron compound as well as on the degree of graphitisation and the density of the graphite matrix. On the basis of the results a possible diffusion mechanism is proposed. A second communication will deal with the compatibility of boron containing coated particles, borides and boronated graphite with graphite.