激光打孔是对带热障涂层高温合金冷却孔加工的重要方法.采用球形薄壁空壳全稳定纳米t'-YSZ粉体进行了全稳定四方相热障涂层的制备,并使用飞秒激光对热障涂层进行气膜孔加工.通过X射线衍射、扫描电子显微镜对涂层形貌、相组成和元素成分等进行分析.结果表明,飞秒激光制备的孔型规则,无重铸缩孔.涂层中各界面未开裂,说明涂层在加工中保持了良好的结合力.高温合金中元素成分的分布未受激光打孔的影响,说明合金基材保持了较好的化学稳定性.热障涂层经过 1050℃水淬 100 次考核后,气膜孔形状依然保持完好,涂层未发生脱落,这说明加工了气膜孔的t'-YSZ涂层具有高抗热震性能.
Laser drilling is an important method for cooling holes in superalloys with thermal barrier coatings.In this paper,fully stabilized tetragonal phase thermal barrier coatings were prepared using spherical thin-walled hollow shell fully stabilized nano t'-YSZ powders,and the thermal barrier coatings were subjected to film hole processing using a femtosecond laser.The results show that the holes prepared by femtosecond laser are regular with no recast and shrinkage.There was no cracking at each interface in the coating,indicating that the coating maintained a good bond during processing.The distribution of elemental compositions in the superalloys was not affected by laser drilling,indicating that the alloy substrate material maintained good chemical stability.After the thermal barrier coating was quenched at 1050℃for 100 times,the shape of the air film holes remained intact and the coating did not peel off.It indicates that the t'-YSZ coatings with processed film holes have high thermal shock resistance.