Al/Ni含能多层膜在Al2O3陶瓷/不锈钢焊接中的应用

采用磁控溅射设备,生长AuSn合金做焊料层、Al/Ni含能多层膜做热量提供层,实现了不锈钢和Al_2O_3间的异质材料自蔓延高温扩散焊。利用SEM、XRD和DSC等测试手段表征AuSn合金和Al/Ni含能多层膜的微观形貌、相成分和放热量;用万能试验机测试焊接接头的力学性能。结果表明,AuSn合金的质量比基本达到80∶20,而多层膜的层状结构清晰,反应热达到1 239 J/g。焊接实验结果表明,仅使用AuSn焊料时,剪切强度仅为46 MPa,在增加Al/Ni含能多层膜后,其剪切强度可达90 MPa,强度提高了约一倍。焊接接头的界面显微形貌和相结构研究表明,剪切强度的增强主要是Al/Ni多层膜提供了额外能量使得界面处的反应剧烈,陶瓷金属化层与中间层的反应加剧,形成了新的反应生成物。

Study on welding properties of Al/Ni Energetic Multilayer Film in Heterogeneous Materials

The AuSn alloy was grown by magnetron sputtering as the solder layer and the Al/Ni energetic multilayer film was used as the heat supply layer to realize the heterogeneous soldering between stainless steel and Al2O3.The morphology and basic properties of the AuSn alloy and Al/Ni energetic multilayer films were investigated by SEM, XRD and DSC. The mechanical properties of the welded joints were tested by a universal testing machine. The result shows, the mass ratio of AuSn alloy is basically 80:20, and the layered structure of the multilayer film is clear, the heat of reaction reaches 1239 J/g. Studies have shown that only AuSn solder has a shear strength of 46 MPa. After increasing the Al/Ni energetic multilayer film, the shear strength can reach 90 MPa and the strength is increased by about one time. The microstructure and phase structure of the welded joints show that the increase of shear strength is mainly due to the additional energy provided by the Al/Ni multilayer film, which makes the reaction at the interface intense, and the reaction between the ceramic metallization layer and the intermediate layer is intensified,and new reaction products formed.