脉冲电子束与喷砂复合处理对MCrAlY涂层表面粗糙度及结合强度的影响

采用强流脉冲电子束(high-current pulsed electron beam,HCPEB)技术与喷砂技术对MCrAlY金属粘结层表面进行复合处理,考察处理前后MCrAlY涂层形貌和表面粗糙度的变化及其对粘结层与YSZ陶瓷层之间结合强度的影响.结果表明,HCPEB轰击处理后,涂层表面发生重熔,形成大量的连续起伏的胞状凸起结构,重熔层组织较为致密. HCPEB与喷砂复合处理后,凸起结构最表层发生粗化,涂层表面形成大量的连续均匀的锯齿状凹凸点,进而使涂层表面进一步粗化,表面粗糙度增加.拉伸试验结果显示,经过复合处理的MCrAlY涂层与YSZ陶瓷层之间的结合强度明显提高. HCPEB与喷砂复合技术不仅强化了陶瓷面层与粘结层之间的结合,同样也保证了涂层界面的完整性及均匀性.

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.