Characteristics of Ni-Cr-Co-W-Mo-Ta-B brazing filler

Ni-Cr-Co-W-Mo-B alloy powder was prepared by gas atomization.The particle morphology and element distribution of the powder were investigated by SEM.The melting characteristics of the Ni-Cr-Co-W-Mo-Ta-B powder were evaluated by DSC.The Ni-Cr-Co-W-Mo-Ta-B flexible insert alloy cloth was obtained through a thermal rolling technology.The bonding strength at room temperature and stress rupture life at 1 010℃/248 MPa were measured.The results indicate that Ni-Cr-Co-W-Mo-Ta-B particles existas ball-shape and the element distributions are homogeneous in the particles.The liquidus temperature of the alloy is 1 127℃.The tensile strength at room temperature and stress rupture life at 1 010℃/248 MPa of the completed joints are almost identical to those of the superalloy substrate when the Ni-base superalloy was bonded by the transient liquid phase(TLP) bonding using Ni-Cr-Co-W-Mo-Ta-B powder as an insert alloy.