热压扩散焊接法制备Ti—Al复合电极材料及性能

摘要

The structure and properties of of the Ti - Al composite electrode materials prepared by the hot-pressing diffusion bonding method was analyzed by SEM, EDS, four-probe method and electrochemical workstation. The results show that the metallurgical bonding of Ti and Al can be achieved by the method of hot-pressing diffusion sintering with static pressure of 6 MPa, bonding temperature of 550 ℃ and holding time in Ar higher than 90 min. Change process of the diffusion reactive layer with temperature is TiAl→ TiAl2→TiAl3. The electrochemical properties of the composite electrode materials is also much better than pure Ti anode, and the effects of preparation conditions and the resistivity on electrochemical properties are consistent. Under the same condition, the polarization potential of composite materials will fall by 37 - 54 mV in polarization potential of pure Ti, and the current density can be increased by more than 59.29%, while the resistivity is only 1/10 of pure Ti.%采用热压扩散法制备Ti—Al复合电极材料，并通过SEM、四探针法、EDS、电化学工作站等测试手段对样品的结构与性能进行表征。结果表明：热压扩散焊接在压力6MPa、焊接温度550℃、氩气中保温时间≥90min的条件下，可以实现Ti和Al的冶金结合，而且扩散反应层产物的变化过程是：TiAl→TiAl2→TiAl3；复合材料的电化学性能较纯Ti的有所提高，制备工艺条件对电化学性能的影响与对电阻率的影响一致；在同等条件下，复合材料的极化电位较纯钛下降37-54mV，其电流密度至少可提高59．29％，电阻率仅为纯钛的1／10。