Active brazing of high entropy ceramic and Nb metal: Interfacial microstructure and brazing mechanism. (November 2022)

• Record Type: Journal Article
• Authors: Wang, Pengcheng; Xu, Zhiquan; Qin, Bin; Lin, Jinghuang; Cao, Jian; Feng, Jicai; Qi, Junlei
• Is Part Of: Vacuum. Volume 205(2022)
• Publication Date: 2022-11
• Subjects: Brazing -- High-entropy ceramic -- Nickle-based filler; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2022.111464
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: To development large-size and complex high-entropy ceramic (HEC) components, the joining of (Ti0.2 Zr0.2 Nb0.2 Ta0.2 Cr0.2 )C and Nb metal with nickel-based filler alloy was performed. The microstructure was characterized by SEM and the phase composition was analyzed by EDS and XRD. The brazing mechanism of the joint was mainly derived from the diffusion of Nb, which formed the NbC reaction layer in the HEC part and the diffusion zone in Nb metal part. The highest shear strength of the brazed joints at 1170 °C/10min was 139 MPa at room temperature and 117 MPa at 800 °C. In addition, the effect of brazing temperature on the microstructure and shear strength was discussed. This work provided a key method to prepare high-temperature resistant complex and large-size HEC components. Highlights: This work provides a feasible method to fabricate large-size and complex HEC component. The brazing mechanism is ascribed to the diffusion of Nb to form Nb(s, s) diffusion zone and NbC reaction layer. A maximum shear strength of the joint is 139 MPa at room temperature and 119 MPa at 800 °C.