Influence of Direct Splat-Affecting Parameters on the Splat-Type Distribution, Porosity, and Density of Segmentation Cracks in Plasma-Sprayed YSZ Coatings
Influence of Direct Splat-Affecting Parameters on the Splat-Type Distribution, Porosity, and Density of Segmentation Cracks in Plasma-Sprayed YSZ Coatings
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DOI：
10.1007/s11666-021-01180-4
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发表时间：
2021-03-18
影响因子：
3.1
通讯作者：
Baumann, I.
中科院分区：
文献类型：
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作者：
Tillmann, W.;Khalil, O.;Baumann, I.
大气等离子喷涂陶瓷涂层的完整性和性能受溅射形貌和溅射互连的高度控制。在这项研究中，选定的参数（喷涂角度，喷枪的表面速度，和基板温度）的飞溅形态和涂层微观结构的影响进行了研究。一组最喜欢的喷枪参数，其对飞溅形态和涂层微观结构的影响已被以前的实验所验证，被用来进行本工作的实验。结果发现，在热的基板上沉积完全熔融的颗粒增加了约60%的盘状飞溅的分数的不规则飞溅的分数为代价。预热基体也增加了孔隙数和涂层孔隙率水平，但不影响分段裂纹的密度。相比之下，喷枪的表面速度不影响飞溅形态，而缓慢的速度降低涂层孔隙率，并在产生分段裂纹中起着重要作用。将喷射角度改变15度，会使盘状飞溅变形高达20%，并略微降低孔隙率水平。然而，改变喷射角度并不影响分段裂纹的产生。
The integrity and properties of ceramic coatings produced by atmospheric plasma spraying are highly controlled by the splat morphology and splat interconnection. In this study, the influence of selected parameters (spray angle, surface velocity of the spray gun, and substrate temperature) on splat morphology and coating microstructure was investigated. A favorite set of spray gun parameters, of which their effects on splat morphology and coating microstructure have been verified by previous experiments, were used to conduct the experiments for the present work. It was found that depositing fully molten particles on a hot substrate increases the fraction of disk-like splats by about 60% at the expense of the fraction of irregular splats. Preheating the substrate also increases the pore count and level of coating porosity, while it does not influence the density of segmentation cracks. In contrast, the surface velocity of the spray gun does not affect the splat morphology while a slow speed decreases the coating porosity and plays a significant role in generating segmentation cracks. Shifting the spray angle by 15 degrees distorts up to 20% of disk-like splats and slightly decreases the porosity level. However, changing the spray angle does not affect the generation of segmentation cracks.