期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 441, 期 1-2, 页码 119-125出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.08.099
关键词
thermal barrier coating; thermally grown oxide; preoxidation; oxygen partial pressure
The effects of oxygen partial pressure (pO(2)) Of the preoxidation atmosphere on the growth of thermally grown oxide (TGO) and thermal cycle life of plasma-sprayed thermal barrier coatings (TBCs) were investigated. The pO(2) of the preoxidation atmosphere was controlled by using a solidstate electrochemical oxygen pump system. The purity and microstructure of continuous Al2O3 layer formed on the bond coat during preoxidation at 1050 degrees C were highly influenced by the pO(2) of the atmosphere. The specimen preoxidized at 1050 degrees C under a pO(2) of 10(-14) to 10(-15) atm, which is around the dissolution pressure of (Co, Ni)(Al, Cr)(2)O-4 spinel, showed the lowest growth rate of TGO and the longest thermal cycle life. (c) 2006 Elsevier B.V. All rights reserved.
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