TY - JOUR
T1 - Preparation, Microstructure and Thermal Conductivity of Plasma-Sprayed (Y0.8Gd0.2)3Al5O12 Coatings
AU - Wang, Shixing
AU - He, Jian
AU - Xue, Zhaolu
N1 - Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/4
Y1 - 2022/4
N2 - Garnet-type rare earth aluminate compounds are one class of promising potential candidate materials for thermal barrier coatings (TBCs). In this paper, (Y0.8Gd0.2)3Al5O12 (GYAG) coatings are fabricated by air plasma spraying, with the microstructure, high-temperature phase stability, and thermal conductivity investigated. The results showed that the as-deposited GYAG coating was relatively dense, and contained garnet-type (Y0.8Gd0.2)3Al5O12 phase and a small amount of (Y,Gd)AlO3 and amorphous phases. The crystallized GYAG coating exhibited good phase stability from room temperature to 1450◦C. The coating had the lowest thermal conductivity of 1.17 W·m−1 ·K−1 at 800◦C, approximately 15% lower than that of the yttria-stabilized zirconia (YSZ) coating. After heat treatment at 1100◦C, the coating became denser with some fine grain precipitation, and formed a number of transverse and longitudinal cracks.
AB - Garnet-type rare earth aluminate compounds are one class of promising potential candidate materials for thermal barrier coatings (TBCs). In this paper, (Y0.8Gd0.2)3Al5O12 (GYAG) coatings are fabricated by air plasma spraying, with the microstructure, high-temperature phase stability, and thermal conductivity investigated. The results showed that the as-deposited GYAG coating was relatively dense, and contained garnet-type (Y0.8Gd0.2)3Al5O12 phase and a small amount of (Y,Gd)AlO3 and amorphous phases. The crystallized GYAG coating exhibited good phase stability from room temperature to 1450◦C. The coating had the lowest thermal conductivity of 1.17 W·m−1 ·K−1 at 800◦C, approximately 15% lower than that of the yttria-stabilized zirconia (YSZ) coating. After heat treatment at 1100◦C, the coating became denser with some fine grain precipitation, and formed a number of transverse and longitudinal cracks.
KW - (YGd)AlO
KW - Air plasma spraying (APS)
KW - Phase stability
KW - Thermal barrier coatings (TBCs)
KW - Thermal conductivity
UR - https://www.scopus.com/pages/publications/85132030994
U2 - 10.3390/coatings12040510
DO - 10.3390/coatings12040510
M3 - 文章
AN - SCOPUS:85132030994
SN - 2079-6412
VL - 12
JO - Coatings
JF - Coatings
IS - 4
M1 - 510
ER -