Dissimilar brazing welding of Ti6Al4V/lead-free bismuthate glass/ZrO2 assisted by laser surface texturing

Abstract

Ti6Al4V alloy and ZrO2 ceramic are both used in similar fields, including electronics, aerospace, and biomedicine. Brazing techniques can be used to join these two materials, broadening their range of applications. One effective joining method is the use of a sealing glass melt of various oxides. This approach provides a strong bond between the ceramic and metal. However, it can be difficult for the glass to wet to the metal surface requiring the alloy to undergo oxidation at high temperatures for an extended period. This study involves the use of laser surface texturing to change the alloy surface roughness and shape. This procedure results in better adhesion of the sealing glass to metal surfaces. When the number of laser scanning is 10, the surface roughness Ra reaches 5.62 μm and the surface energy reaches 46.88, which are the maximum values after comparison. The wetting angle of the sealing glass on the surface is the fastest to reach the wetting state, and the shear strength of the joint reaches the maximum of 46 MPa. This technique created an oxide layer, which contributed to strong mechanical bonding between the grooves and solder, which improved joint performance through chemical and mechanical bonding. This work provides a new approach to the connection of metals and ceramics.