急冷Ni-Cr-B合金箔带钎料的制备及其可焊性

Preparation of Rapidly Quenched Ni-Cr-B Alloy Ribbon and Its Weldability

采用液态急冷单辊法制备了急冷Ni-Cr-B中间合金箔带。利用DSC ,XRD和SEM等方法对急冷Ni-Cr-B合金箔带的固液相线的温度 ,结构及成分分布进行了研究。利用液态金属表面张力仪测定了急冷Ni-Cr-B合金箔带在镍基高温合金上的润湿性。并采用此中间合金对镍基高温合金进行了瞬态液相连接 (TLPBonding) ,测定了连接后的试棒在 10 10℃ / 2 48MPa下的持久寿命。结果表明 ,制备的Ni-Cr -B合金箔带成分均匀 ,熔点适于TLP连接。液态钎料对镍基高温合金基体具有良好的润湿性。

Rapidly quenched Ni Cr B alloy ribbon was prepared by the rapidly quenched method using a single steel roll.By XRD,SEM and DSC methods,the microstructure,element distributions and temperature of solidus and liquidus of Ni Cr B alloy ribbon were studied respectively.The wettability of Ni Cr B alloy were investigated by use of surface tension instrument.The TLP bonding was carried out using Ni Cr B ribbon and the stress rupture life of the bonded specimen at 1 010 ℃/248 MPa were measured.The results show that the chemical compositions of Ni Cr B ribbon are homogeneous and its melting point is suitable to TLP bonding.The wettability of molten Ni Cr B alloy on Ni based superalloy substrate is good.After TLP bonding,the stress rupture life at 1 010 ℃/248 MPa almost reaches that of the superalloy substrate.