Microstructure and Luminance Properties of Integrated Translucent Alumina Tube Used in Metal Halide Lamps

Abstract:

The integrated translucent alumina tube used in metal halide lamps have been fabricated by gelcasting process. The influence of sintering process, various sintering fluxes on the micro- structure was discussed. Furthermore, the relation between the luminance and the microstructure was also investigated. The results reveal that when the sintering temperature is 1750°C, the holding time is 6h, the compact product whose average grain size is about 20μm could be obtained; the triple dopant combinations of MgO, Y2O3, La2O3 can promote sintering and improve the microstructure more than double, single dopants and the contents of sintering flux are 99.6wt%Al2O3, 0.2wt%MgO, 0.1wt.%Y2O3 and 0.1wt.%La2O3 respectively; The transmittance increases with the pore decreaseing, the grain size enlarging and the degree of the surface finish improving, the average in line transmittance is about 40%.

• Periodical: Advanced Materials Research (Volume 177)
• Pages: 272-276
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.177.272
• Online since: December 2010
• Authors: Liu Feng, Zhi Wei Chen, Jin Ye Niu
• Keywords: Luminance Properties, Microstructure, Translucent Alumina Ceramics

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