論文

2008年3月25日

高温曝露されたEB-PVD遮熱コーティングの残留応力と組織

日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A
  • 鈴木 賢治
  • ,
  • 菖蒲 敬久
  • ,
  • 和田 国彦
  • ,
  • 松原 秀彰

74
739
開始ページ
370
終了ページ
376
記述言語
日本語
掲載種別
DOI
10.1299/kikaia.74.370
出版者・発行元
日本機械学会

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 mo1% yittria was made by a electron beam-physical vapor deposition (EB-PVD) with a rotation. The thickness of the bond coating was about 0.18 min, and the thickness of the top coating was about 0.12 mm. The rotation speeds of specimens in the EB-PVD process were 5rpm, 10rpm and 20 rpm. The specimens were exposed at 1273K for 200h. 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 5rpm and 10rpm, the in-plane compressive residual stresses were released by the high temperature exposure. For the specimen with 20 rpm, the in-plane residual stress did not change by the high temperature exposure, because it was very small before the exposure. 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 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 feather-like columnar structure decreased after the high temperature exposure. This volume decrease caused the release of the in-plane residual stresses.

リンク情報
DOI
https://doi.org/10.1299/kikaia.74.370
CiNii Articles
http://ci.nii.ac.jp/naid/110006643460
CiNii Books
http://ci.nii.ac.jp/ncid/AN0018742X
ID情報
  • DOI : 10.1299/kikaia.74.370
  • ISSN : 0387-5008
  • CiNii Articles ID : 110006643460
  • CiNii Books ID : AN0018742X
  • identifiers.cinii_nr_id : 1000030154537

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