High-Intensity Discharge Lamp with Mo–SiO2 Functionally Graded Material |
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| Authors: | Ayumu Umemoto Koichi Hayashi Kunihiko Nakashima Noritaka Saito Kenji Kaneko Keisaku Ogi |
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| Affiliation: | TOTO Ltd., Advanced Ceramic Division, Kitakyushu-city 802-8601, Japan; Department of Materials Process and Engineering, Graduate School of Engineering, Kyushu University, Fukuoka-city 812-8581, Japan |
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| Abstract: | 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 lamp), 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 required. Furthermore, lamps survive without breakage. 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. |
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