Role of environmental deposits and operating surface temperature in spallation of air plasma sprayed thermal barrier coatings

被引：346
作者：
Borom, MP
Johnson, CA
Peluso, LA
机构：
[1] GE Corp. Research and Development, Schenectady
来源：
SURFACE & COATINGS TECHNOLOGY | 1996年 / 86卷 / 1-3期
关键词：
thermal barrier coatings; spallation; Cmas; gas turbines;
D O I：
10.1016/S0257-8972(96)02994-5
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Spallation of air plasma spray (APS) thermal barrier coatings (TBCs) was investigated on power generation combustors, military turboshaft engines, and commercial turboprop engines. In each case, irrespective of operating conditions or geographic location, spallation was linked to the presence and infiltration of high temperature molten phases of similar composition. Electron microprobe analysis found that, from all the possible oxides available in the external environment, only CaO, MgO, Al2O3 and SiO2 (CMAS) are incorporated in the molten phase that infiltrates the TBC microstructure. Fe and Ni oxides from metallic components and zirconia and yttria from the TBC were also found in varying amounts in the molten phase. The melting and recrystallization behavior of CMAS deposits was carefully defined by differential thermal analysis.
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页码：116 / 126
页数：11
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