616 遮熱コーティングの熱疲労損傷と酸化層成長の検討

概要

論文の詳細を見る
Thermal cycle tests of thermal barrier coating (TBC) in air were carried out to investigate both thermal fatigue damage and the growth rate of thermal growth oxidation (TGO) at bond/top coating interface. The specimen with a coating system on a circular plate was used for thermal cycle test. The coating system consists of a ceramic top coat APS 8mass% Y_2O_3ZrO_2 over a bond coat CoNiCrAlY sprayed on a substrate CMSX-2. The microstructures of TBC were observed by scanning electron microscopy (SEM) before and after the tests. The growth rates of TGO layer were also examined from those photographs. Thermal fatigue damage of the specimen was the delamination at top/bond coat interface. It was found that the relationships between the growth thickness w of TGO and heating times t were w=k t^n in repeating heating.
2003-09-23