2026-03-12T19:30:42Z https://niigata-u.repo.nii.ac.jp/oai

oai:niigata-u.repo.nii.ac.jp:00003681 2022-12-15T03:36:48Z 423:424:425 453:454

放射光高エネルギーX線による遮熱コーティングのはく離応力の評価 放射光高エネルギーX線による遮熱コーティングのはく離応力の評価 Estimation of Spalling Stress in Thermal Barrier Coating Using High Energy X-Rays from Synchrotron 鈴木, 賢治 田中, 啓介 秋庭, 義明 川村, 昌志 西尾, 光司 尾角, 英毅 日本機械学会 Residual Stress Delamination Experimental Stress Analysis Thermal Barrier Coating Synchrotron A new hybrid method is proposed to estimate the spalling stress normal to the interface in thermal barrier coating. As the X-ray energy becomes higher, the penetration depth gets deeper. The in-plane stress, σ_1, is measured by the conventional X-ray with the low energy, and the out-of-plane stress, σ_1-σ_3, is measured by the synchrotron X-ray with high energy. The spalling stress, σ_3, can be estimated from two measurements obtained by the conventional and the synchrotron X-ray methods. The bond coating of NiCoCrAlY with a thickness of 0.2mm was made by plasma spraying on a Ni super-alloy substrate, and the ZrO_2 top coating with a thickness of 0.2mm was plasma sprayed on the bond coating. The distribution of the in-plane residual stresses, σ_1, in the top coating was measured with characteristic X-rays Cr-Kα by repeating the measurements after successive removal of the surface layer. The residual stresses, σ_1-σ_3, were measured by the synchrotron X-rays with 73 keV. The spalling stress was estimated from the stresses measured by the two methods. The spalling stress, σ_3, was small tensile beneath the surface of the top coat but increased to 75 MPa near the interface between the top and bond coatings. A high tensile stress near the interface may induce the delamination of coatings. 日本機械学会 2004-05 jpn journal article http://hdl.handle.net/10191/5714 https://niigata-u.repo.nii.ac.jp/records/3681 http://ci.nii.ac.jp/naid/110004998750 AN0018742X 03875008 日本機械学会論文集. A編 日本機械学会論文集. A編 70 693 724 730 https://niigata-u.repo.nii.ac.jp/record/3681/files/9_0012.pdf application/pdf 664.4 kB 2019-07-30