Al_2O_3Cu-Ti-Zr/Nb钎焊研究

RESEARCH OF THE BONDING MECHANISMS OF Al_2O_3/Cu-Ti-Zr/Nb

使用Cu Ti Zr钎料对Al2 O3 Nb进行了钎焊试验。通过扫描电镜、能谱、X射线衍射分析了界面形貌、元素分布 ,并对反应相进行了判定。Cu70 Ti2 5 Zr5 钎料在 12 93K、10min条件下界面产生了 3种新相 :Cu2 Ti4O、Ti固溶体、CuTi,界面结构为Al2 O3 Cu2 Ti4O Ti固溶体 CuTi Cu固溶体 +CuTi。采用拉剪试验评定了强度 ,结果证实12 93K、10min ,使用Cu70 Ti2 5 Zr5 钎料的接头强度最高达到 16 2MPa ,增加或减少Ti的质量分数以及改变保温时间都会使接头抗剪强度下降。

Ceramic Al 2O 3 is bonded with Nb using Cu Ti Zr as filler metal. The morphologies and chemical positions of the formed phases are investigated by scanning electron microscopy (SEM), X ray diffraction (XRD) and energy dispersive spectroscopy (EDS). It is found that the interface structure of diffusion bonded joints bonded at 1?293?K for 10?min using Cu 70 Ti 25 Zr 5 as braze is Al 2O 3/Cu 2Ti 4O/Ti solid solution/ CuTi/Cu solid solution + CuTi due to the formation of new phases Cu 2Ti 4O, Ti solid solution and CuTi. Strength of the Al 2O 3/Cu 70 Ti 25 Zr 5/?Nb joint bonded at 1?293?K for 10?min can be reached to 162?MPa. The lower the content of Ti and bonding time are, or the higher the content of Ti and bonding time are, lower strength of joints becomes.