Effects of hybrid process combining pulsed electron beam and sandblasting on roughness and bonding strength of MCrAlY coating surface

A hybrid process which combined high current pulse electron beam (HCPEB) technology and sandblasting technology was applied on MCrAlY coating surface. The results show that after HCPEB processing, the coating surface remelted and formed continuous cellular structure, and the remelted layer had dense structure. After HCPEB and sandblasting hybrid process, a large number of serrated points formed which continuously and uniformly appeared on the surface coating, and the surface roughness increased. The tensile test result shows that the bonding strength improved obviously between the MCrAlY coating after hybrid treatment and the YSZ ceramic layer. The hybrid technology not only strengthened the bonding of ceramic surface and the coating, but also ensured the integrity and uniformity of the interface.