BNi82CrSiB钎料真空钎焊FeCrAl合金接头界面组织

Microstructure of FeCrAl Alloy Vacuum Brazing with Ni82CrSiB Filler Metal

采用BNi82CrSiB带状钎料在1070℃/10min工艺条件下对FeCrAl合金箔带制成的多孔圆形器件进行了真空钎焊实验,并对钎焊接头界面组织和相组成进行了分析。实验结果表明:多孔圆形器件焊后表面无宏观缺陷,钎焊接头致密完整,试样中99%(总共约有8000个)的钎焊接头实现连接。钎缝组织由-γNi基固溶体、金属间化合物和共晶组织构成。钎缝中物相有-γNi,FeNi3,AlNi3,CrB,Ni17Si3。钎焊接头中含有较多的硼化物相。

The FeCrAl foil was coiled into a round porous structure and it was brazed in vacuum at 1070℃ for 10min using the BNi82CrSiB brazing foils.Results showed that there were no defects on the surface,and the sound joint was obtained,and 99%（the number of joints is about 8000） of the solder joints were connected.The microstructures were made up with Ni-based solid solution,inter-metallic compounds and eutectic structure.It was shown that the interface reaction products were γ-Ni,FeNi3,AlNi3,CrB and Ni17Si3.A great number of borides were formed in the brazed joint.