Joining zirconia with nickel-based superalloys for extreme applications by using a pressure-free high-temperature resistant adhesive

• Published in: Ceramics international 2022-03, Vol.48 (6), p.8025-8030
• Main Authors: Wang, Mingchao, Liu, Jingxuan, Chen, Zhaolin, Hu, Xiaoxia, Zhai, Wenzheng, Tao, Xin, Liu, Jiachen
• Format: Article
• Language: English
• Subjects: Adhesion technique; CTE; Dissimilar materials joining; High-temperature bonding; Zirconia/inconel 625 joints
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2021.12.002

In order to meet the high demand for joining ceramic/superalloy composite structure in extreme environments, a novel high-temperature resistant adhesion technique was developed for joining ZrO2 and Inconel 625 by applying an aluminum phosphate emulsion/zirconium sol based adhesive. With increasing temperature, a series of reactions occurred in adhesive, and its high-temperature bonding was attributed to the formation of a composite structure containing various ceramics and intermetallics. The adhesive after RT curing could find direct applications in extreme environments, and provide bonding strength no less than 2.5 MPa in the temperature range of RT-1100 °C. The bonding strength was higher than 4 MPa in the temperature range of 800–1000 °C, which was further attributed to the formation of an effective CTE-gradient relationship among ZrO2, adhesive and Inconel 625, as well as the interfacial reactions between the two substrates. The work broadened the application of adhesion technique and brought new ideas for joining dissimilar engineering materials.