Effect of mo powder surface condition on fabrication of Mo-SiO2 functionally graded materials with slipcasting method

Ayumu Umemoto, Koichi Hayashi, Kyoko Hayano, Noritaka Saito, Kenji Kaneko, Kunihiko Nakashima

研究成果: 著書/レポートタイプへの貢献会議での発言

1 引用 (Scopus)

抄録

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 long 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. 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 numbers of heating cycles, with no cooling system are 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. In this paper, effects of Mo powder surface conditions on the fabrication of Mo-SiO 2 FGM have been investigated. Mo-SiO2 FGM with as-received Mo powder revealed that the Mo particles were homogenously distributed, which resulted in no microscopic compositional gradient. In contrast. Mo-SiO 2 FGM with pre-treated Mo powder provided a uniform gradient from the conductive part (Mo-rich phase) to the sealing part (amorphous silica).

元の言語英語
ホスト出版物のタイトルProceedings of the 2nd Int. Conf. Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials
ページ219-224
ページ数6
出版物ステータス出版済み - 12 1 2007
イベント2nd International Conference on Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials - Kurashiki, 日本
継続期間: 9 6 20069 9 2006

出版物シリーズ

名前Ceramic Transactions
198
ISSN(印刷物)1042-1122

その他

その他2nd International Conference on Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials
日本
Kurashiki
期間9/6/069/9/06

Fingerprint

Functionally graded materials
Discharge lamps
Powders
Fabrication
Electric lamps
Fused silica
Cooling systems
Gases
Electrodes
Leakage (fluid)
Patents and inventions
Thermal stress
Silicon Dioxide
Metal foil
Thermal expansion
Metals
Silica
Heating

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

これを引用

Umemoto, A., Hayashi, K., Hayano, K., Saito, N., Kaneko, K., & Nakashima, K. (2007). Effect of mo powder surface condition on fabrication of Mo-SiO2 functionally graded materials with slipcasting method. : Proceedings of the 2nd Int. Conf. Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials (pp. 219-224). (Ceramic Transactions; 巻数 198).

Effect of mo powder surface condition on fabrication of Mo-SiO2 functionally graded materials with slipcasting method. / Umemoto, Ayumu; Hayashi, Koichi; Hayano, Kyoko; Saito, Noritaka; Kaneko, Kenji; Nakashima, Kunihiko.

Proceedings of the 2nd Int. Conf. Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials. 2007. p. 219-224 (Ceramic Transactions; 巻 198).

研究成果: 著書/レポートタイプへの貢献会議での発言

Umemoto, A, Hayashi, K, Hayano, K, Saito, N, Kaneko, K & Nakashima, K 2007, Effect of mo powder surface condition on fabrication of Mo-SiO2 functionally graded materials with slipcasting method. : Proceedings of the 2nd Int. Conf. Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials. Ceramic Transactions, 巻. 198, pp. 219-224, 2nd International Conference on Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials, Kurashiki, 日本, 9/6/06.
Umemoto A, Hayashi K, Hayano K, Saito N, Kaneko K, Nakashima K. Effect of mo powder surface condition on fabrication of Mo-SiO2 functionally graded materials with slipcasting method. : Proceedings of the 2nd Int. Conf. Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials. 2007. p. 219-224. (Ceramic Transactions).
Umemoto, Ayumu ; Hayashi, Koichi ; Hayano, Kyoko ; Saito, Noritaka ; Kaneko, Kenji ; Nakashima, Kunihiko. / Effect of mo powder surface condition on fabrication of Mo-SiO2 functionally graded materials with slipcasting method. Proceedings of the 2nd Int. Conf. Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials. 2007. pp. 219-224 (Ceramic Transactions).
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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 long 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. 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 numbers of heating cycles, with no cooling system are 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. In this paper, effects of Mo powder surface conditions on the fabrication of Mo-SiO 2 FGM have been investigated. Mo-SiO2 FGM with as-received Mo powder revealed that the Mo particles were homogenously distributed, which resulted in no microscopic compositional gradient. In contrast. Mo-SiO 2 FGM with pre-treated Mo powder provided a uniform gradient from the conductive part (Mo-rich phase) to the sealing part (amorphous silica).",
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