采用Ag-Cu-Ti+Mo复合钎料钎焊Si3N4陶瓷

采用Ag-Cu-Ti+Mo复合钎料连接Si3N4陶瓷,利用SEM,TEM,Nanoindentation研究了钎料内钼颗粒含量对接头组织和力学性能的影响.结果表明,在Si3N4/钎料界面处形成了一层致密的反应层,该反应层由TiN和Ti5Si3组成.接头的中间部分由银基固溶体、铜基固溶体、钼颗粒和Ti-Cu金属间化合物组成.借助于纳米压痕技术测定了接头内Ti-Cu化合物以及钎料金属的弹性模量和硬度值.随着钎料内钼颗粒含量的提高,母材/钎料界面反应层厚度逐渐降低;钎料金属中Ti-Cu化合物数量增多;此外,银和铜基固溶体组织逐渐变得细小.当添加5%Mo时,得到最高的接头强度429.4 MPa,该强度相比合金钎料提高了114.7%.

Brazing Si3N4 ceramic with Ag-Cu-Ti+Mo composite filler

A commercial Ag-Cu-Ti alloy with Mo particles reinforcement was introduced for joining Si₃N₄ ceramic.The effect of Mo content on the microstructure and flexural strength of the resultant joints was investigated by SEM,TEM and nanoindentation. The results indicate that a compact reaction layer consisting of TiN and Ti₅Si₃ formed at the Si₃N₄/filler interface.The central part of the joint was composed of Ag-based solid solution, Cu-based solid solution and Mo particles together with Ti-Cu intermetallics. The modulus and hardness of Ti-Cu intermetallics and the brazing alloy in the joint were measured by nanoindentation. With increasing the Mo particles content in the joint,the thickness of reaction layer decreased while the amount of Ti-Cu intermetallics in the brazed layer increased.In addition,Ag-and Cu-based solid solutions in the brazed layer became finer.The maximal bending strength reached 429.4 MPa while incorporating 15vol.% Mo particles,and the joint strength was 114.7% higher than that without adding Mo particles.