Microstructure and Properties of Densified Gd2O3 Bulk

• Published in: Materials 2022-11, Vol.15 (21), p.7793
• Main Authors: Gao, Pei-Hu, Jin, Can, Zeng, Sheng-Cong, Xie, Rui-Guang, Zhang, Bo, Chen, Bai-Yang, Yang, Zhong, Guo, Yong-Chun, Liang, Min-Xian, Li, Jian-Ping, Zhang, Li-Na, Yan, Zhi-Yi, Jia, Lu, Zhao, Dan
• Format: Article
• Language: English
• Subjects: Bulk density; Ceramics; Cracks; Densification; Fracture toughness; Gadolinium oxides; Hardness; Heat conductivity; Heat transfer; High temperature; Mechanical properties; Microstructure; Modulus of elasticity; Morphology; Physical properties; Sintering; Thermal barrier coatings; Thermal conductivity; Thermal expansion
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15217793

In this work, Gd2O3 bulks were sintered at temperatures ranging from 1400 °C to 1600 °C for times from 6 h to 24 h, and their microstructure and properties were studied for a wider application of materials in thermal barrier coatings. The densification of the Gd2O3 bulk reached 96.16% when it was sintered at 1600 °C for 24 h. The elastic modulus, hardness, fracture toughness and thermal conductivity of the bulks all increased with the rise in sintering temperature and extension of sintering time, while the coefficient of thermal expansion decreased. When the Gd2O3 bulk was sintered at 1600 °C for 24 h, it had the greatest elastic modulus, hardness, fracture toughness and thermal conductivity of 201.15 GPa, 9.13 GPa, 15.03 MPa·m0.5 and 2.75 W/(m·k) (at 1100 °C), respectively, as well as the smallest thermal expansion coefficients of 6.69 × 10−6/°C (at 1100 °C).