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。
Residual thermal stress distribution of Si3N4/metal brazing joints was studied by means of Xray diffraction microregion 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1998年第2期210-213,共4页
The Chinese Journal of Nonferrous Metals
关键词
钎焊
热应力
接头强度
氮化硅
Si3N4 brazing residual thermal stress strength of joints
