Abstract: Objective This study investigates the influence of three different brazing filler metals, BCo51, BNi65, and BCo44, on microstructure and properties of brazed joints between DD26 and CoCrNb alloys. The aim is to provide theoretical support and procedural guidance for the application of this wear-resistant material in aeroengines. Methods DD26 and CoCrNb alloys were brazed with three different brazing filler metals, BCo51, BNi65, and BCo44, under varying brazing process parameters. The microstructure of brazed joints was analyzed, and endurance life of brazed joints under conditions of 1050 ℃/25 MPa was tested. Fracture morphology analysis was also conducted. Results Microstructure of brazed joints with BCo51 brazing filler metals primarily consisted of a Co-based solid solution and blocky boride phases rich in W, Cr, and Ni element, blocky boride phases were densely distributed on the DD26 alloy side. Brazed joints with BNi65 brazing filler metal exhibited an about 89 μm interfacial reaction layer at the CoCrNb alloy interface, microstructure of the reaction layer composed of Ni, Cr solid solutions and carbides/borides rich in Nb, W. Microstructure of brazing seam contained γ/γ′ phases and sporadic blocky boride precipitates. Microstructure of brazed joints with BCo44 brazing filler metal featured a Co-based solid solution and blocky boride phases rich in Co, W, Cr, Ni, and Nb element, and boride phases were uniformly dispersed in brazing seam. Comparative analysis of stress rupture life of brazed joints with three types of brazing filler metals under 1050 ℃/25 MPa revealed that brazed joints with BNi65 and BCo44 brazing filler metals achieved comparable stress rupture life, the average value was more than 40 h, while brazed joints with BCo51 brazing filler metals showed significantly lower stress rupture life, the average value was 15.79 h. Conclusion BNi65 and BCo44 brazing filler metals demonstrates more stable interfacial bonding characteristics at high temperatures, whose longer stress rupture life is closely related to homogeneous interfacial layers and rational precipitate distribution. However, brazed joints with BCo51 brazing filler metal experience a significant reduction in their stress rupture life due to the preferential crack propagation caused by the dense and continuous distribution of brittle phases at the interface between brazing seam and DD26 alloy.