AlMgB_(14)-TiB_2与Nb的场辅助扩散连接机理和影响因素

Mechanism and influencing factors of field-assisted diffusion bonding for AlMgB_(14)-TiB_2 and Nb

采用场辅助扩散连接(FDB)技术对AlMgB14-30%TiB_2复合材料和金属Nb进行连接,改变压力等试验参数,研究其对连接形貌和性能的影响,分析扩散连接机理。用扫描电镜(SEM)观察截面形貌,用剪切强度表征连接件的力学性能。结果表明:电场的存在使反应界面激活能下降,有利于TiB_2相在连接界面处的富集;连接成功的最小压力为50 MPa;控制初始硼粉的含氧量可以有效避免在连接界面处产生氧化物带。

Field-assisted diffusion bonding （FDB） technology was used to bond AIMgBI4-30%TiB2 composites with metal Nb, the influence of pressure and other test parameters on the morphology and property was studied, and the diffusion bonding mechanism was analyzed. The shear strength was used to characterize the mechanical properties of the connectors and the scanning electron microscope （SEM） was used to observe the cross-sectional morphology. The experimental results show that the presence of electric field makes the activation energy of the reaction interface decrease, which is beneficial to the enrichment of TiB2 phase at the bonding interface. The minimum pressure for successful bonding is 50 MPa. Controlling the oxygen content of the initial boron powder can effectively avoid the generation of oxide bands at the bonding interface.