等离子喷涂“桩钉结构”YSZ激光改性热障涂层的组织与性能（英文）

发布时间：2018-04-27 08:29

本文选题：YSZ + 桩钉结构　；参考：《稀有金属材料与工程》2017年03期

【摘要】：本试验采用大气等离子喷涂(APS)在含有NiCoCrAlYTa粘结层的镍基高温合金基体表面沉积氧化钇部分稳定氧化锆(YSZ)热障涂层,然后采用Nd:YAG的脉冲激光对热障涂层表面进行选择性激光表面改性处理,最后对喷涂态和"桩钉结构"激光改性YSZ涂层的组织与性能进行分析研究。结果表明:选择性激光表面改性形成的单元体表面粗糙度明显降低,表面的孔隙基本消除,同时形成了垂直于表面的分割网状裂纹,激光改性的"桩钉结构"单元体中还包含有柱状晶和等轴晶组织。XRD分析发现,喷涂态与"桩钉结构"单元体中都包含有非平衡四方相T',然而经过激光改性后,喷涂态中的单斜相M消失,72°~76°范围中T'峰明显增大。结果还发现,"桩钉结构"激光表面改性后,喷涂态YSZ热障涂层的平均结合性能由7.3 MPa增大到13.3 MPa;"桩钉结构"YSZ涂层的隔热性能比喷涂态的隔热性能有所下降,这是由于激光表面改性导致陶瓷层组织结构改变所造成的。
[Abstract]:In this experiment, yttrium oxide partially stabilized zirconia (YSZ) thermal barrier coating was deposited on the surface of nickel base superalloy with NiCoCrAlYTa bonding layer by atmospheric plasma spraying (APS). Then the surface of the thermal barrier coating was treated by selective laser surface modification with Nd:YAG pulse laser. Finally, the spraying state and "pile nail structure" were modified by laser Y. The microstructure and properties of the SZ coating are analyzed and studied. The results show that the surface roughness of the cell surface modified by the selective laser surface is obviously reduced, the surface pores are basically eliminated, and the split mesh crack perpendicular to the surface is formed. The laser modified "pile nail structure" also contains columnar and equiaxed crystal tissue.XRD points. It is found that the non balanced Quartet phase T'is contained in the sprayed and PEG structure units. However, after the laser modification, the monoclinic M in the spray state disappears and the T' peak in the 72 degree ~76 degree increases obviously. The results also show that the average bonding properties of the sprayed YSZ thermal barrier coating are increased from 7.3 MPa to 13.3 M after the "pile nail structure" laser surface modification. Pa, the thermal insulation performance of the "pile nail structure" YSZ coating is lower than that of the spraying state, which is due to the change of the laser surface modification to the microstructure of the ceramic layer.

【作者单位】：华南理工大学;广州有色金属研究院;广东省现代表面工程实验室;
【基金】：National Key Basic Research Development Program of China(“973 Program”)(2012CB625100) Fundamental Research Funds of GGRIIT(1043113)
【分类号】：TG174.4

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