Fei Shen Ong   Ryotaro Nishi   Hirobumi Tobe   Eiichi Sato   
Journal of the European Ceramic Society 42(6) 2707-2717 2022年6月 [査読有り]
A novel two-step bonding of Ti-6Al-4V/Si3N4 joint was developed with Nb interlayer as residual-stress reliever via low-pressure transient-liquid-phase bonding (TLPB) of Ti-6Al-4V/Nb side prior to active-metal brazing of Nb/Si3N4 side. While 1.75 m...
Hirobumi Tobe   Yuichi Matsuki   Shinsuke Takeuchi   Eiichi Sato   
MATERIALS TRANSACTIONS 61(1) 68-71 2020年 [査読有り]
A novel deployable rocket nozzle utilizing superelasticity was proposed in this study. Ti-4.5Al-3V-2Fe-2Mo alloy (SP-700) sheets were heat-treated to have appropriate alpha/beta ratio so that the sheet shows superelasticity at room temperature. A ...
The silicon nitride (Si3N4) will be used for the thruster for the Venus probe and is expected to encounter meteoroid impacts in outer space. Meteoroids and debris environment play an important role in the reduction of the lifespan of a spacecraft....
T. Matsunaga   T. Kameyama   S. Ueda   E. Sato   
15TH INTERNATIONAL CONFERENCE ON THE STRENGTH OF MATERIALS (ICSMA-15) 240 012072 2010年
Only hexagonal close-packed (h.c.p.) materials show creep behaviour significantly at ambient temperature or less even below their 0.2% proof stresses with their stress exponents of 3.0 and their apparent activation energies of 20 kJ/mol. Transmiss...
Hypervelocity impact tests of aluminum oxide (Al2O3) at 1.0km/s or less km/s were conducted, and failure behaviors were examined for the purpose of obtaining the basic date for verifying the validity of a numerical simulation method. In addition, ...