(北京有色金属研究总院复合材料中心，北京 100088;
北京科技大学， 北京 100083)
摘 要: 利用X射线衍射微区应力测定及剪切断裂实验方法研究了Si3N4/金属钎焊 接头中的残余热应力分布， 分析和讨论了残余热应力对接头断裂形式及强度的影响。 结果表明在Si3N4/金属钎焊接头中由于残余热应力的作用， 使断裂常常发生在Si3N4一侧。 本实验通过选用热膨胀系数与Si3N4相近的金属进行 钎焊，结果可以有效地降低接头中的残余热应力， 提高接头强度。 另外， 钎焊界面上Cu应力缓解层的加入也有利于使接头中残余热应力进一步降低。
关键字: Si3N4 钎焊 热应力 接头强度
（General Research Institute for Non-ferrous Metals, Beijing 100088, P. R. China ;
University of Science and Technology Beijing, Beijing 100083, P. R. China）
Abstract:Residual thermal stress distribution of Si3N4/metal brazing joints was studied by means of X-ray diffraction micro-region stress analysis and shearing tests. The effect of residual thermal stress on fracture form and strength of brazing joints was discussed. The results showed that fracture occurs very easily along the Si3N4 side of the brazing joints because of the concentration of residual thermal stress; when the metal whose thermal expansion coefficent is near that of Si3N4 is chosen to braze with Si3N4, the residual thermal stress can decrease and the strength will increase. A reduced internal thermal stress of brazing joints was also obtained using Cu as interlayer metal.
Key words: Si3N4 brazing residual thermal stress strength of joints
