Premium
The morphology, thermal property, and failure mechanism of GdNdZrO thermal barrier coatings by EB‐PVD
Author(s) -
Shen Zaoyu,
Liu Zheng,
Liu Guanxi,
He Limin,
Mu Rende,
Xu Zhenhua
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13738
Subject(s) - thermal barrier coating , materials science , yttria stabilized zirconia , thermal shock , scanning electron microscope , ceramic , composite material , cubic zirconia , coating , transmission electron microscopy , layer (electronics) , physical vapor deposition , nanotechnology
Nowadays, the Gd 2 Zr 2 O 7 thermal barrier coatings (TBCs) have been evaluated as a promising alternative to yttria‐stabilized zirconia (YSZ). Thus, this investigation focuses on the thermal property, morphology, and failure mechanism of double ceramic layers (DCLs) GdNdZrO/YSZ advanced TBCs. The GdNdZrO coatings with columnar morphology have been deposited on NiCoCrAlYHf bond coating using an electron beam physical vapor deposition method. Material characterizations mainly include X‐ray diffraction, scanning electron microscope, and transmission electron microscopy. The thermal conductivity of GdNdZrO ceramic material is 0.494 W/mK at 1200°C. The thermal shock life of GdNdZrO/YSZ TBCs shows an average shock life of 5235 cycles. The TBC degradation occurs on the crack area within thermally grown oxide layer leading to the interface instability. The interface broken might play an important role in the failure mechanism of TBCs.