钎焊时间对SiC<sub>P</sub>/Al6063复合材料真空钎焊组织性能影响

钎焊时间对SiC_P/Al6063复合材料真空钎焊组织性能影响

摘要: 采用Al5Si28Cu2.5Ti钎料,在真空钎焊炉中钎焊SiC_P为55％的SiC_P/Al6063铝基复合材料,钎焊温度580 ℃,研究了钎焊时间对接头组织性能的影响. 结果表明,钎焊时间20 min时钎缝存在大量的共晶组织,界面结合强度低,钎焊时间60 min时共晶组织消失,钎缝中有网状脆性相析出,碳化物有偏聚现象,界面有微裂纹,接头性能不好,钎焊时间40 min接头的组织性能最好,抗剪强度为96 MPa.

Abstract: The SiC_P/Al6063 composites containing 55% SiC_P was joined by vacuum brazing process using Al5Si28Cu2.5Ti filler at 580 ℃. The influence of holding time on the joint microstructure and mechanical property was studied. The results show that the active titanium element improved the solder wettability of composite materials. The joint microstructure used holding time of 40min was the best with a shear strength of 96 MPa.