TY - JOUR
T1 - Protectiveness of Pt and Gd2Zr2O7 layers on EB-PVD YSZ thermal barrier coatings against calcium–magnesium–alumina–silicate (CMAS) attack
AU - Wang, Lu
AU - Guo, Lei
AU - Li, Zhuomin
AU - Peng, Hui
AU - Ma, Yue
AU - Gong, Shengkai
AU - Guo, Hongbo
N1 - Publisher Copyright:
© 2015 Elsevier Ltd and Techna Group S.r.l.
PY - 2015/11
Y1 - 2015/11
N2 - Thermal barrier coatings (TBCs) are susceptible to degradation caused by environmental deposits mainly composed of calcium–magnesium–aluminum–silicon (CMAS). In this work, the degradation of electron beam physical vapour deposition (EB-PVD) yttria stabilized zirconia (YSZ) TBC due to CMAS attack was investigated. To protect the YSZ coating, a Pt film and a Gd2Zr2O7 (GZO) layer were deposited onto the YSZ coating surface by electroplating and EB-PVD, respectively. The coatings were heat treated at 1250 °C for 4 h with CMAS deposits, and their microstructure and chemical composition after CMAS attack were investigated. Electroplating a dense and defect-free Pt film on YSZ coating could provide effective protection from CMAS attack, but EB-PVD GZO coating was unable to prevent molten CMAS infiltration, mainly due to the large inter-columnar gaps. The associated mechanisms were discussed in detail.
AB - Thermal barrier coatings (TBCs) are susceptible to degradation caused by environmental deposits mainly composed of calcium–magnesium–aluminum–silicon (CMAS). In this work, the degradation of electron beam physical vapour deposition (EB-PVD) yttria stabilized zirconia (YSZ) TBC due to CMAS attack was investigated. To protect the YSZ coating, a Pt film and a Gd2Zr2O7 (GZO) layer were deposited onto the YSZ coating surface by electroplating and EB-PVD, respectively. The coatings were heat treated at 1250 °C for 4 h with CMAS deposits, and their microstructure and chemical composition after CMAS attack were investigated. Electroplating a dense and defect-free Pt film on YSZ coating could provide effective protection from CMAS attack, but EB-PVD GZO coating was unable to prevent molten CMAS infiltration, mainly due to the large inter-columnar gaps. The associated mechanisms were discussed in detail.
KW - Calcium–magnesium–aluminum–silicon (CMAS)
KW - GdZrO layer
KW - Pt film
KW - Thermal barrier coatings (TBCs)
KW - Yttria stabilized zirconia (YSZ)
UR - https://www.scopus.com/pages/publications/84930899334
U2 - 10.1016/j.ceramint.2015.05.128
DO - 10.1016/j.ceramint.2015.05.128
M3 - 文章
AN - SCOPUS:84930899334
SN - 0272-8842
VL - 41
SP - 11662
EP - 11669
JO - Ceramics International
JF - Ceramics International
IS - 9
ER -