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

EB-PVD遮熱コーティングの高温下における応力測定

鈴木 賢治*; 菖蒲 敬久  ; 田中 啓介*

Suzuki, Kenji*; Shobu, Takahisa; Tanaka, Keisuke*

The substrate material was nickel-based superalloy (In738LC), CoNiCrAlY was pressureless plasma-sprayed on the substrate as the bond coating. As the top coating, zirconia with 4 mol percents yittria was made by a electron beam-physical vapor deposition (EB-PVD) under rotating the substrate. 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 high temperature exposure. The in-plane residual stress near the interface was a large compression. From a viewpoint of reduction of the residual stress, the rotation speed of 20 rpm was the excellent condition.