Joining high volume fraction SiC particle reinforced aluminum matrix composites using Bi2O3-B2O3-ZnO-BaO-Na2O glass

Abstract

This paper designs a bismuthate glass 58Bi2O3-25B2O3-13ZnO-2BaO-2Na2O in mol%(BBZ) and uses it to join 65 % volume fraction SiC particle reinforced aluminum matrix composites (65 vol%SiCp/ZL102) in an atmospheric environment. The thermal properties of BBZ glass were studied, and the effect of the brazing process on the mechanical properties of the joint was explored. The results show that the glass transition temperature of the glass is 344.6 °C, and the two crystallization temperatures are 464.7 °C and 544.3 °C. The oxidation of the parent material can improve the mechanical properties of the joint. The increase in welding temperature and the extension of holding time make the mechanical properties of the joint first increase and then decrease. When brazing at 490 °C for 30 min, the pre-oxidized composite material was brazed, the joint was defect-free, and the shear strength of the joint was 19.4 MPa. The analysis of the shear fracture showed that the fracture mainly occurred in the glass brazing material, which is a brittle fracture.