Oxidation behavior of thermal barrier coating systems with Al interlayer under isothermal loading

被引：8
作者：
Ali, I [1 ]
Sokolowski, P. [2 ,3 ]
Grund, T. [1 ]
Pawlowski, L. [2 ]
Lampke, T. [1 ]
机构：
[1] Tech Univ Chemnitz, Inst Mat Sci & Engn, Chemnitz, Germany
[2] Univ Limoges, Inst Rech Ceram IRCER, Limoges, France
[3] Wroclaw Univ Technol, Fac Mech Engn, Wroclaw, Poland
来源：
20TH CHEMNITZ SEMINAR ON MATERIALS ENGINEERING | 2018年 / 373卷
关键词：
MECHANISMS; LIFETIME; DAMAGE;
D O I：
10.1088/1757-899X/373/1/012010
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In the present study, the phenomena related to the Thermally Grown Oxides (TGO) in atmospheric plasma sprayed Thermal Barrier Coatings (TBCs) are discussed. CoNiCrAlY bond coatings were sprayed on Inconel 600 substrates. Subsequently, thin Al layers were deposited by DC-Magnetron sputtering. Finally, yttria-stabilized zirconia (YSZ) top coatings were deposited to form a three-layered TBC system. The thus produced aluminum interlayer containing thermal barrier coatings (Al-TBC) were subjected to isothermal exposure with different holding times at 1150 degrees C and compared with reference TBCs of the same kind, but without Al interlayers (R-TBC). The oxide film formation in the interface between bond coating (BC) and top coating (TC) was investigated by scanning electron microscope (SEM) after 100 and 300 h of high temperature isothermal exposure. The growth of this oxide film as a function of the isothermal exposure time was studied. As a result, the designed Al-TBC system exhibited better oxidation resistance in the BC/TC interface than the two-layered R-TBC system. This was lead back to the Al enrichment, which slows down the formation rate of transition metal oxides during thermal loading.
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页数：6
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