不基于熔态润湿的Al/Al2O3直接钎焊

针对Al熔液在850℃以下不润湿Al₂O₃而难以直接钎焊的困难, 本工作研究了溅射Al对Al₂O₃的“润湿”作用, 提出了一种采用溅射Al基薄膜作为钎料直接钎焊Al₂O₃的方法。结果表明, 这种方法可以在不满足熔态Al润湿条件的680℃实现Al和Al-Cu合金对Al₂O₃的直接真空钎焊, 并且仅需0.1 Pa的真空度。所获得的Al/Al₂O₃的接头剪切强度达到115 MPa, Al-1.6at% Cu合金钎焊接头的剪切强度可提高到163 MPa, 当钎料中的Cu含量提高至14.3at%后, 钎焊接头中焊缝与陶瓷界面产生Cu的偏聚, 接头的剪切强度因界面断裂降低为127 MPa。并对这种不基于金属熔态润湿钎焊方法的原理进行了分析讨论。

Direct Brazing of Al/Al2O3 without Wettability of Molten Metal

Al₂O₃ cannot be directly brazed with aluminum due to the poor wettability of aluminum on alumina below 850℃. Based upon effect of sputtered aluminum wetting on Al₂O₃, a direct brazing method was proposed to utilize sputtered Al-based films as brazing fillers on alumina. The results show that direct brazing of Al₂O₃ by Al and Al-Cu alloy can be achieved at 680℃ in vacuum with vacuum level only of 0.1 Pa. Through this method, the shear strength of joint with pure Al as brazing filler is 115 MPa and that with Al-1.6at% Cu is up to 163 MPa. When the Cu content in the Al-Cu alloy increases to 14.3at%, the shear strength of joint decreases to 127 MPa, due to the joint fracture generating at the interface caused by the interfacial segregation of Cu. Moreover, the principle of this direct brazing method not based on wettability of molten metal is analyzed.