Mo-SiO2 functionally graded materials for high intensity discharge lamp

Ayumu Umemoto, Koichi Hayashi, Kunihiko Nakashima, Noritaka Saito, Kenji Kaneko, Keisaku Ogi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The conventional high intensity discharge lamps are made of Mo foil-sealing method, in which the Mo-metal of 30 μm thick is sandwiched by the fused silica envelope. The conventional high intensity discharge lamps therefore requires cooling system to reduce the thermal stress between Mo and fused silica during the switching operation and a lung sealing zone is usually required to complete hermeticity, especially in high power devices, so that the production of compact high intensity discharge lamps has been a Herculean task, Here, we show the invention of the new type of hermetically-sealed high intensity discharge lamps, made of Mo-SiO2 functionally graded material (FGM) as an electrode and a sealing component. In the case of high intensity discharge lamps with Mo-SiO2 FGM (FGM-Lanip), the thermal expansion coefficient between Mo and SiO2 is functionally graded so that it tolerates a large number of heating cycles, with no cooling system are required, Furthermore lamps survive without breakage of lamp takes place, The W electrode is totally separated from the lamp envelope by the FGM, so that no leakage of the luminous elements or gases takes place, when a large gas pressure exists inside a lamp.

    Original languageEnglish
    Title of host publicationDevelopments and Applications of Advanced Engineering Ceramics and Composites - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6
    Pages53-58
    Number of pages6
    Publication statusPublished - Jul 24 2006
    Event6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6 - Maui, HI, United States
    Duration: Sep 11 2005Sep 16 2005

    Publication series

    NameCeramic Transactions
    Volume192
    ISSN (Print)1042-1122

    Other

    Other6th Pacific Rim Conference on Ceramic and Glass Technology, PacRim6
    Country/TerritoryUnited States
    CityMaui, HI
    Period9/11/059/16/05

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Materials Chemistry

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