TY  - THES
AU  - Fischer, Sarah Christine
TI  - Korrosion von PCA durch Metalljodidschmelzen sowie deren Benetzungseigenschaften
VL  - 44
SN  - 1866-1793
PB  - RWTH Aachen
VL  - Dr. (Univ.)
CY  - Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
M1  - PreJuSER-5438
SN  - 978-3-89336-584-5
T2  - Schriften des Forschungszentrums Jülich : Energie & Umwelt / Energy & Environment
SP  - 148 S.
PY  - 2009
N1  - Record converted from VDB: 12.11.2012
N1  - RWTH Aachen, Diss., 2009
AB  - On high-energy discharge lamps with burners consisting of polycrystalline aluminum oxide
AB  - (PCA) corrosion leads to relocation of the wall material; the extent of the phenomenon
AB  - depends on the composition and the wetting behaviour of the liquid salt mixture contained in the lamp.
AB  - 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.
AB  - By combining the YOUNG-LAPLACE-Equation with the BUTLER-Equation, the excess GIBBS
AB  - energy could be related to the contact angles of salt mixtures, which makes the estimation of their wetting properties possible.
AB  - The extent of the corrosion was determined by annealing experiments in a temperature
AB  - 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.
AB  - All these effects could also be reproduced by computer simulations, for which a special
AB  - program was developed. This program may lead to the development of advanced software in
AB  - the future which can calculate the shape and corrosivity of lamp-relevant salt melts.
LB  - PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
UR  - https://juser.fz-juelich.de/record/5438
ER  -