Al<sub>2</sub>O<sub>3</sub>陶瓷与紫铜的间接钎焊

Al₂O₃陶瓷与紫铜的间接钎焊

摘要: 利用Sn0.3Ag0.7Cu-4%Ti金属化涂料,在金属化温度900 ℃、保温时间30 min条件下,对Al₂O₃陶瓷表面进行金属化处理,然后在钎焊温度600 ℃、保温时间5 min条件下,利用Sn0.3Ag0.7Cu钎料实现Al₂O₃陶瓷与紫铜的间接钎焊,通过SEM,EDS和XRD等分析测试手段对金属化层显微组织、Al₂O₃陶瓷/铜接头结合强度和接头断口形貌等进行了分析. 结果表明,利用金属化方法得到了均匀且与Al₂O₃陶瓷结合良好的金属化层,并实现了Al₂O₃陶瓷与铜的间接连接,接头界面结构为Cu/Cu₃Sn/Cu₆Sn₅/Sn(s,s)+Ti₆Sn₅/Al₂O₃陶瓷. 钎焊接头抗剪强度为13.6 MPa,接头断裂发生于金属间化合物层.

Abstract: The alumina ceramics were metallized by Sn0.3Ag0.7Cu-4%Ti under 900 ℃ and held for 30 min. Then the metallized alumina ceramics were brazed to copper at 600 ℃ for 5 min. The microstructure of metallization layer and shear strength and fracture morphology of brazed joints were analyzed by SEM, EDS and XRD et al. The metallization layer had a sound bond to alumina ceramic by the new metallization method, and the indirect brazing alumina to copper was realized. The interfacial microstructure of alumina/Cu joint was Cu/Cu3Sn/Cu6Sn5/Sn(s,s)+Ti6Sn5/alumina. The shear strength of joint is 13.6 MPa. Fracture analysis showed that joint fracture occurred in intermetallic compound layer.