Abstract
Bonding between tungsten and 0Cr13 steel using a 90W-6Mn-4Ni(mass fraction) powder mixtures/Ni multi-interlayer,was carried out in vacuum at 1 100 ℃ for 10 min,30 min,60 min,120 min with 5 MPa.The microstructures,composition distribution and fracture characteristics of the joints are studied by scanning electron microscope(SEM),energy dispersive spectroscopy(EDS) and their mechanical properties are tested by shear experiments.The results show that the joints comprised tungsten/tungsten heavy alloy layer/Ni/0Cr13 steel.Among them,the tungsten heavy alloy layer is formed through liquid phase sintering of 90W-6Mn-4Ni mixed powder.Holding time has no significant effect on the microstructure of tungsten heavy alloy layer,which composes of metallurgical bonded and evenly distributed MnNi-rich phase and tungsten phase.Good bonding between tungsten matrix and tungsten heavy alloy layer is realized based on press brazing mechanism.The shear strength of joints is from 202 MPa to 217 MPa.All fractures occur in bonding zone of tungsten matrix and tungsten heavy alloy layer.The typical cleavage fracture of tungsten matrix and the tungsten phase interface debonding fracture accompanied by MnNi-rich phase ductile fracture of tungsten heavy alloy layer are observed in the fracture surfaces.
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