Research on the Photometry and Corrosion Characteristics of Rare Earth Iodides in Ceramic Metal Halide Lamps

Abstract:

Rare earth iodides are commonly used in ceramic metal halide (CMH) lamps, a kind of high intensity discharge (HID) lamp. Rare earth metals in the discharge plasma inside the arc tube contribute to the superb performance of CMH lamps. On the other hand, however, polycrystal alumina (PCA) arc tube corrosion due to its reaction with rare earth iodides causes the deterioration of parameter maintenance, and constrains lifetime of the lamps. In this study, PCA arc tubes with specific rare earth iodides are prepared. Aging tests up to 2000 hours are conducted to evaluate the effects of single rare earth iodides on lamp performance. Also X-ray analysis shows the corrosion content of PCA arc tube by different rare earth iodides. The result shows that PCA tubes with single rare earth iodides are more corrosive than the mixture of various rare earth iodides.

• Periodical: Advanced Materials Research (Volumes 562-564)
• Pages: 111-114
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.562-564.111
• Online since: August 2012
• Authors: Wei Li, Shui Jun Shi, Ying Dong Wei, Zhen Min Zhou, Shan Duan Zhang
• Keywords: Ceramic Metal Halide Lamps, Corrosion, Photometry, Polycrystal Alumina (PCA), Rare Earth Iodide

References

[1] W. van Erk: Pure. Appl. Chem. Vol. 72 (2000), p.2159.

[2] S. Fischer, U. Niemann, T. Markus: J. Phys. D: Appl. Phys. Vol. 41 (2008), 144015 (5pp).

[3] K. Hilpert, U. Niemann: Thermoch. Acta. Vol. 299 (1997), p.49.

[4] K. Hilpert, U. Niemann: in Proc. 8th Int. Symp. on the Science and Technology of Light Sources (Greifswald 1998) p.326.

[5] N. Brates, D. Goodman, J. Maya, et al: Inst. Phys. Conf. Series Vol. 182 (2004), p.501.