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Journal Articles

Development of instrumentation systems for severe accidents, 5; Basic properties of hydrogen sensor with solid electrolyte for safety measures of LWRs

Otsuka, Noriaki; Matsui, Yoshinori; Tsuchiya, Kunihiko; Matsui, Tetsuya*; Arita, Setsuo*; Wada, Shohei*

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 7 Pages, 2015/05

no abstracts in English

Journal Articles

Microstructure and residual stress of EB-PVD TBCs grown under substrate rotation

Suzuki, Kenji*; Shobu, Takahisa; Wada, Kunihiko*; Matsubara, Hideaki*; Kawamura, Masashi*

Zairyo, 57(7), p.674 - 680, 2008/07

Journal Articles

Residual stresses structure of EB-PVD thermal barrier coatings exposed at high temperature

Suzuki, Kenji*; Shobu, Takahisa; Wada, Kunihiko*; Matsubara, Hideaki*

Nihon Kikai Gakkai Rombunshu, A, 74(739), p.370 - 376, 2008/03

Thickness of the bond coating was about 0.18 mm, and the thickness of the top coating was about 0.12 mm. The rotation speeds of specimens in the EB-PVD process were 5 rpm, 10 rpm and 20 rpm. The specimens were oxidized at 1273 K for 200 h. The in-plane residual stress was measured by a conventional X-ray method, and the out-of-plane residual strain was measured by a strain scanning method with hard synchrotron X-rays. For the specimens with 5 rpm and 10 rpm, the in-plane compressive residual stresses were released by the oxidization. For the specimen with 20 rpm, the in-plane residual stress did not change by the oxidization, because it was very small before the oxidization. The in-plane residual stresses were large compression near the interface. For the specimens with 5 rpm and 10 rpm, the out-of-plane stresses were small from the coating surface but became a compression near the interface. Both in-plane and out-of-plane residual stresses of the specimen with 20 rpm were very small. In the effect of decreasing the residual stress, the rotation speed of 20 rpm was the excellent condition. According to the observation with a scanning electron microscope, the featherlike columnar structure decreased after the oxidization. This volume decrease caused the release of the in-plane residual stresses.

Journal Articles

Residual stress in zirconia coating by EB-PVD method

Suzuki, Kenji*; Wada, Kunihiko*; Matsubara, Hideaki*; Shobu, Takahisa; Kawamura, Masashi*; Tanaka, Keisuke*

Zairyo, 56(7), p.588 - 593, 2007/07

The Ni-based superalloy IN738LC was used as the substrate material, and CoNiCrAlY powder was pressureless plasma-sprayed on the substrate as the bond coating. Zirconia was coated as the top coating by the electron beam-physical vapor deposition (EV-PVD) method. In the EB-PVD process, the specimens were kept at 1223 K and rotated with 5 rpm, 10 rpm and 20 rpm. According to the microscopic observation and the result of the pole figures, the top coatings had a columnar structure, which was made by the piling up of (111) planes. The cross section of the column had a diamond shape, and its diagonal was parallel to the rotation axis. The residual stress on the surface of the top coatings was evaluated by the X-ray diffraction method. Each diffraction profile was separated into the 133 and the 331 peak, and the residual stress was measured by the sin$$^{2}$$ $$psi$$ method. The measured residual stresses were -76.6 MPa for 5 rpm, -63.0 MPa for 10 rpm and -25.1 MPa for 20 rpm.

Oral presentation

Current status and vision of study for severe accident instrumentation system, 9; Evaluation of characteristic of solid electrolyte type hydrogen sensor

Otsuka, Noriaki; Matsui, Yoshinori; Tsuchiya, Kunihiko; Matsui, Tetsuya*; Arita, Setsuo*; Wada, Shohei*

no journal, , 

no abstracts in English

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