Ni-Cr-Co-W-Mo-Ta-B合金钎料的特性

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

关键词:  Ni-Cr-Co-W-Mo-Ta-B合金粉  镍基高温合金  TLP连接  力学性能

Key words:  Ni-Cr-Co-W-Mo-Ta-B powder  Ni-base superalloy  TLP bonding  mechanical properties

摘要:

采用超声气体雾化法制备了Ni-Cr-Co-W-Mo-Ta-B合金粉.利用SEM研究了合金粉的微观形貌和化学成分分布;利用DSC分析了合金粉的熔化特性;采用热轧工艺制备Ni-Cr-Co-W-Mo-Ta-B合金柔性布作为中间层合金.测定了TLP连接镍基高温合金后试样在室温下的断裂强度和1 010℃/248 MPa下的持久寿命.结果表明,Ni-Cr-Co-W-Mo-Ta-B合金粉呈规则的球形,化学成分均匀,其完全熔化温度为1 127℃;TLP连接镍基高温合金后在室温下的断裂强度和1 010℃/248 MPa下的持久寿命与母材相当.

Abstract:

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.