Research on the Process and Properties of Brazing High Volume SiCp / 6063Al Composites with Glass

Abstract:

A composite glass solder, which composed of PbO-B2O3-ZnO system and PbTiO3 crystal was designed to braze 60vol.% SiCp / 6063Al composites in air. Assisted by anodic oxidation of the composites and hot press sintering of the composite glass solder can improve the strength of the joint. The effects of temperature and holding time on brazed joints were studied by the methods of DSC, XRD, SEM and EDS. The results show that the strength of the joint can be improved by the anodic oxidation of the composites, the increase of the brazing temperature and the prolongation of the holding time to a certain extent. Using the composite glass welding piece to braze composites which was anodic oxidation already ,when the brazing temperature is 450℃ and the holding time is 30min, the shear strength of the brazed joint is 33MPa. During the brazing process, the oxide film of the composites is dissolved in the galss, and the Al element is diffused in a slight amount. At last, a weld similar to the base metal structure formed.