Ag-Cu-Ti钎焊金刚石/铜复合材料的组织和性能

Microstructure and mechanical properties of diamond/Cu composite joint using Ag-Cu-Ti active brazing alloy

采用97(72Ag-28Cu)-3Ti活性钎料钎焊了Diamond/Cu复合材料和Al2O3陶瓷,研究了主要钎焊条件如钎焊温度和保温时间对接头强度的影响。结果表明,钎焊过程中Ti元素易聚集在金刚石颗粒周围并形成TiC化合物层。TiC化合物的形貌与Diamond/Cu钎焊接头剪切强度有密切关系,金刚石表面生长适当厚度的TiC化合物层能增强钎焊接头的剪切强度,但如果TiC为颗粒状或TiC化合物层生长过厚,将削弱钎焊接头的剪切强度。钎焊接头的最大剪切强度可达117 MPa。

Reactive brazing of diamond/Cu composites to alumina by 97 （72Ag-28Cu）-3Ti alloy was performed. The influence of the main brazing parameters, such as peak heating temperature and holding time, on microstructure and properties of the brazing joint was investigated. The results show that Ti element tends to concentrate at the surface of diamond particle and form TiC compound. The morphology of TiC compound strongly influences the shear strength of the brazing joint. It is considered that a proper thickness of TiC layer on the diamond particle surface can ameliorate the shear strength of the brazing joint. However, on the contrary, the particle-like shaped TiC compound or a thicker TiC compound layer can impair the shear strength. The maximum shear strength is found to be 117 MPa.