ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this work we present the investigations on the determination of the mechanism ofsodium loss in High Pressure Sodium (HPS) lamps. The transport through the ceramic arc tubeconsists of several steps (solution in the ceramics, diffusion through the ceramics, leaving the bulkphase, evaporation from the surface). Among the listed processes the mechanism of the diffusionwas investigated by model-experiments. A ceramic arc tube was applied as a reactor chamber, inwhich polycrystalline ceramic plates were heated at 600-1100ºC in controlled Na and Xeatmosphere. The sodium diffusion profiles developed by the heat-treatment were measured by XPSand SIMS and from the measurements we tried to draw a conclusion about the mechanism of sodiumdiffusion through the ceramic discharge tube.The ceramic discharge tube were measured by X- ray diffraction, too. We found traces ofsome Na-O-Al compound
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.537-538.405.pdf
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