Thermo-physical and mechanical properties of Yb2O3 and Sc2O3 co-doped Gd2Zr2O7 ceramics

被引：35
作者：
Guo, Yiqian [1 ]
He, Wenting [1 ]
Guo, Hongbo [1 ,2 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, 37 Xueyuan Rd, Beijing 100191, Peoples R China
[2] Beihang Univ, Key Lab High Temp Struct Mat & Protect Coatings, Minist Ind & Informat Technol, 37 Xueyuan Rd, Beijing 100191, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2020年 / 46卷 / 11期
关键词：
Thermal barrier coatings; Gd2Zr2O7; Doping; Fracture toughness; Thermal conductivity; BARRIER COATINGS; THERMOPHYSICAL PROPERTIES; ELECTRONIC-STRUCTURES; FRACTURE-TOUGHNESS; DEFECT CHEMISTRY; CONDUCTIVITY; STABILITY; ZIRCONATE; DURABILITY; EXPANSION;
D O I：
10.1016/j.ceramint.2020.04.209
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ceramic materials for the thermal barrier coating (TBC) application of Gd2Zr2O7 (GZO), (Gd0 .94Yb0.06)(2)Zr2O7 (GYb(0.06)Z), (Gd0.925Sc0.075)(2)Zr2O7 (GSc(0.075)Z), (Gd0.865Sc0.075Yb0.06)(2)Zr2O7 (GSc(0.075)Yb(0.06)Z), and (Gd0.8Sc0.1Yb0.1)(2)Zr2O7 (GSc(0.1)Yb(0.1)Z) were successfully synthesized by chemical co-precipitation. The effects of the doping of Sc2O3 and Yb2O3 on the phases, thermo-physical and mechanical properties of the ceramics were investigated. The results show that both Yb2O3 and Sc2O3 doping promoted the phase transition of GZO from pyrochlore to fluorite. All the Sc2O3-doped samples exhibited enhanced fracture toughness, as compared to the undoped sample. Furthermore, the GSc(0.075)Yb(0.06)Z sample revealed a thermal conductivity of similar to 0.8 W/mK at 1200 degrees C, which was nearly 30% lower than that of the undoped sample. The associated mechanisms related to the effects of the doping on the thermophysical and mechanical properties are discussed.
引用
收藏
页码：18888 / 18894
页数：7
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