A Novel Brazing Technology for SiCp/ZL102 Composites Used for Lightweight Transmit/Receive Module in New Generation Phased Array Radar

In this work, Al-17.0Cu-8.0 Mg-1.5Ni an active brazing alloy is designed for brazing third-generation electronic packaging material 55 vol. % SiC_p/ZL102 composites. SEM investigation showed that the foil filler prepared by melt spinning technology has smaller grains. The average measured grain size near the roller surface was about 98 ± 3 nm, and the average grain size on the free surface was about 115 ± 2 nm. The chemical potential of foil filler metal was much higher than that of as-cast filler metal and had a higher surface free energy and lower melting point. The interface of the brazed joint was continuous, uniform and dense, and the black oxide layer disappeared at a brazing temperature of 580 °C for 30 min. The maximum shear strength value of the brazed joint was 92 ± 2 MPa, and the air tightness was 2.0 × 10^–10 Pa·m³/s, in line with phased array radar T/R module box packaging requirements. The SEM and EDS of the fracture shown that there were a large number of shear lips, as well as massive particles and extended cracks. The fracture type of brazed joint was brittle fracture.