Shohei Hata
Hitachi
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Publication
Featured researches published by Shohei Hata.
Welding International | 2017
Takuto Yamaguchi; Tomotake Tohei; Osamu Ikeda; Shohei Hata; Yuichi Oda; Kazuma Kuroki; Hiromitsu Kuroda; Akio Hirose
Abstract Al-rich Zn/Al/Zn clad solder were developed as Pb-free solder for a die-attachment. The Zn/Al/Zn clad solder was produced by clad rolling of Zn and Al strips in order to prevent Al from oxidation and improve wettability. The Zn/Al/Zn clad solder was melted at 382°C after solid-state interdiffusion of the Zn and Al layers. Bonding was successfully achieved with bonding pressure of a few kilopascals. Thermal cycle life of Invar-to-Cu substrate joint using the Zn/Al/Zn clad solder was longer than that of Pb-Sn-Ag solder. No Kirkendall voids were observed in the vicinity of the bonded interface after ageing at 250 °C for 1000 h.
Archive | 2009
Shohei Hata; Naoki Matsushima; Takeru Fujinaga
Archive | 2004
Shohei Hata; Hideo Sotokawa; Hiroaki Furuichi
Archive | 2008
Shohei Hata; Naoki Matsushima; Eiji Sakamoto; Ryoji Okada; Takanori Aono; Atsushi Kazama; Toshiki Kida
Archive | 2008
Shohei Hata; Susumu Ishida; 進 石田; 昌平 秦
Archive | 2003
Naoki Matsushima; Hideo Sotokawa; Hideyuki Kuwano; Yoshiaki Niwa; Keiichi Yamada; Masahiro Hirai; Kazumi Kawamoto; Shohei Hata; Toshiaki Takai
Archive | 2010
Susumu Ishida; Shohei Hata
Archive | 2007
Takanori Aono; Shohei Hata; Atsushi Kazama; Toshiki Kida; Naoki Matsushima; Ryoji Okada; Eiji Sakamoto; 英次 坂本; 亮二 岡田; 年紀 木田; 直樹 松嶋; 昌平 秦; 宇紀 青野; 敦 風間
Archive | 2011
Takuto Yamaguchi; Masahide Okamoto; Osamu Ikeda; Hiromitsu Kuroda; Kazuma Kuroki; Shohei Hata; Yuichi Oda
Archive | 2007
Takeshi Fujinaga; Shohei Hata; Toshiaki Koizumi; Eiji Sakamoto; Hideaki Takemori; 英次 坂本; 俊晃 小泉; 昌平 秦; 英昭 竹盛; 猛 藤永
