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000005438 020__ $$a978-3-89336-584-5
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000005438 041__ $$aGerman
000005438 1001_ $$0P:(DE-Juel1)VDB69499$$aFischer, Sarah Christine$$b0$$eCorresponding author$$gmale$$uFZJ
000005438 245__ $$aKorrosion von PCA durch Metalljodidschmelzen sowie deren Benetzungseigenschaften
000005438 260__ $$aForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2009
000005438 300__ $$a148 S.
000005438 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis
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000005438 4900_ $$0PERI:(DE-600)2445288-9$$aSchriften des Forschungszentrums Jülich : Energie & Umwelt / Energy & Environment$$v44$$x1866-1793
000005438 502__ $$aRWTH Aachen, Diss., 2009$$bDr. (Univ.)$$cRWTH Aachen$$d2009
000005438 500__ $$aRecord converted from VDB: 12.11.2012
000005438 520__ $$aOn high-energy discharge lamps with burners consisting of polycrystalline aluminum oxide
(PCA) corrosion leads to relocation of the wall material; the extent of the phenomenon
depends on the composition and the wetting behaviour of the liquid salt mixture contained in the lamp.
The aim of this work was to better comprehend these phenomena. For this the wetting behaviours of several iodides on PCA- and carbon plates in a water-free argon atmosphere was determined in a contact angle measurement apparatus. While pure salts show good or, at high temperatures, complete wetting, the surface wetting of binary salt mixtures is positively worse, even if only small amounts of the second component are present. From the contact angle measurements the surface tension of the pure salts could be determined.
By combining the YOUNG-LAPLACE-Equation with the BUTLER-Equation, the excess GIBBS
energy could be related to the contact angles of salt mixtures, which makes the estimation of their wetting properties possible.
The extent of the corrosion was determined by annealing experiments in a temperature
gradient. No corrosion was found in reference experiments without any salt. In addition to diverse corrosion phenomena the formation of cerium aluminate was observed in some cases.
All these effects could also be reproduced by computer simulations, for which a special
program was developed. This program may lead to the development of advanced software in
the future which can calculate the shape and corrosivity of lamp-relevant salt melts.
000005438 536__ $$0G:(DE-Juel1)FUEK402$$2G:(DE-HGF)$$aRationelle Energieumwandlung$$cP12$$x0
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000005438 9141_ $$y2009
000005438 9131_ $$0G:(DE-Juel1)FUEK402$$bEnergie$$kP12$$lRationelle Energieumwandlung$$vRationelle Energieumwandlung$$x0
000005438 9201_ $$0I:(DE-Juel1)VDB810$$d30.09.2010$$gIEF$$kIEF-2$$lWerkstoffstruktur und Eigenschaften$$x0
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