论文部分内容阅读
利用Thermorestor-W焊接热模拟试验机,采用适当的焊接参数和工艺,能够用铝合金中间层固相扩散连接Si_3N_4和低碳钢。在连接温度下,铝合金Si_3N_4进入孔洞中形成机械连接,而铝合金与Si_3N_4连接的主要机理是铝与Si_3N_4发生固相反应生成AlN。当温度大于530℃时,铝合金/Si_3N_4界面Al,Si扩散层厚度基本上不随温度升高而变化。Si_3N_4/铝合金/低碳钢接头的剪切强度取决于铝合金/钢界面强度,且随扩散连接温度上升而增加。
Using Thermorestor-W welding thermal simulation test machine, using appropriate welding parameters and processes, aluminum alloy intermediate layer can be solid-phase diffusion bonding Si_3N_4 and mild steel. At the connection temperature, the Si_3N_4 aluminum alloy enters into the hole to form a mechanical connection, while the main mechanism of the aluminum alloy to Si_3N_4 is the solid phase reaction between aluminum and Si_3N_4 to form AlN. When the temperature is more than 530 ℃, the thickness of Al and Si diffusion layer in Al / Si_3N_4 interface does not change with the increase of temperature. The shear strength of Si_3N_4 / aluminum / mild steel joints depends on the strength of the aluminum alloy / steel interface and increases with increasing diffusion bonding temperature.