TY - JOUR
T1 - Investigation of ternary rare earth oxide-doped YSZ and its high temperature stability
AU - Chen, Dong
AU - Wang, Quansheng
AU - Liu, Y.
AU - Ning, Xianjin
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/10/25
Y1 - 2019/10/25
N2 - Due to the limited temperature capability of widely used yttria partially stabilized zirconia (YSZ), considerable effort has been directed towards developing promising thermal barrier coating materials for applications above 1200 °C. La2O3-Gd2O3-Yb2O3-Y2O3-doped zirconia (LGYYSZ), as a promising ceramic for advanced thermal barrier coatings, was designed and prepared. The LGYYSZ ceramics consist of tetragonal double-prime phase and cubic phase, and no new phase appears after long-term annealing. The thermal expansion coefficients of LGYYSZ are comparable to the value of YSZ. The values of the thermal conductivities of 0.5LGYYSZ and 1.0LGYYSZ are 1.34 W/(mK) and 1.21 W/(mK) at 1000 °C, respectively, which are approximately 30–40% lower than that of YSZ. Due to the rare earth ions with different radii/masses and the compound effect of multiple point dislocations, a significant improvement of the sintering resistance of LGYYSZ ceramics was observed above 1400 °C with La3+ dopant.
AB - Due to the limited temperature capability of widely used yttria partially stabilized zirconia (YSZ), considerable effort has been directed towards developing promising thermal barrier coating materials for applications above 1200 °C. La2O3-Gd2O3-Yb2O3-Y2O3-doped zirconia (LGYYSZ), as a promising ceramic for advanced thermal barrier coatings, was designed and prepared. The LGYYSZ ceramics consist of tetragonal double-prime phase and cubic phase, and no new phase appears after long-term annealing. The thermal expansion coefficients of LGYYSZ are comparable to the value of YSZ. The values of the thermal conductivities of 0.5LGYYSZ and 1.0LGYYSZ are 1.34 W/(mK) and 1.21 W/(mK) at 1000 °C, respectively, which are approximately 30–40% lower than that of YSZ. Due to the rare earth ions with different radii/masses and the compound effect of multiple point dislocations, a significant improvement of the sintering resistance of LGYYSZ ceramics was observed above 1400 °C with La3+ dopant.
KW - Phase stability
KW - Rare earth oxides
KW - Sintering resistance
KW - Thermal barrier coatings
UR - http://www.scopus.com/inward/record.url?scp=85069839160&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.07.198
DO - 10.1016/j.jallcom.2019.07.198
M3 - Article
AN - SCOPUS:85069839160
SN - 0925-8388
VL - 806
SP - 580
EP - 586
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -