3A21铝合金馈源喇叭真空钎焊工艺研究  

Research on Vacuum Brazing Process of 3A21 Aluminium Alloy Feeder Horn

作　　者：李国超 钟帅 黄文翔 周梦悦 LI Guochao;ZHONG Shuai;HUANG Wenxiang;ZHOU Mengyue(No.724 Research Institute of CSIC,Nanjing 211153,China;School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国船舶重工集团公司第七二四研究所,江苏南京211153 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《热加工工艺》2020年第13期147-150,共4页Hot Working Technology

摘　　要：对3A21铝合金多层板的钎焊工艺进行优化,并采用Al-Si-Mg钎料成功实现了馈源喇叭天线的可靠连接,解决了其精密加工难度大、产品合格率低、焊接变形严重等技术瓶颈。通过金相组织、扫描电镜观察、X射线衍射分析,显微硬度和剪切强度测试对钎焊接头组织形貌和力学性能等进行了分析。结果表明:钎焊接头剪切强度能够满足带脊板喇叭天线设计的要求,接头焊缝微观组织主要包括α-Al基体、块状Al-Si共晶相、初晶Si和少量(MnFe)3SiAl12金属间化合物等,母材与钎料之间已实现冶金结合。钎焊接头的剪切强度达44.1MPa,断口表面有很多呈河流花纹状的相对平坦的解理面,为脆性断口。The brazing process of 3 A21 aluminium alloy multilayer plate was optimized, and the reliable connection of feeder horn antenna was successfully realized by using Al-Si-Mg brazing filler metal, which solved the technical bottlenecks of difficult precision processing, low product qualification rate and serious welding deformation. The microstructures and mechanical properties of the brazed joints were analyzed by optical microscope, scanning electron microscopy observation,XRD analysis, and microhardness and shear strength tests. The results show that the shear strength of brazed joints can meet the designed requirements of horn antenna with ridge plate. The joints mainly consist of the Al matrix, block eutectic Al-Si phase, primary Si and a small amount of(MnFe)3SiAl12 intermetallic compound. The metallurgical bonding between base metal and brazing filler metal is realized. The shear strength of brazed joint reaches 44.1 MPa, and there are many relatively flat cleavage planes with river pattern, which belongs to brittle fractures.

关 键 词：馈源喇叭 真空钎焊 力学性能 显微组织 

分 类 号：TG454[金属学及工艺—焊接]