Influence of Gradient Index and Pores on the Properties and Internal Stress of Continuous Transition Ceramic–Metal Coating
Influence of Gradient Index and Pores on the Properties and Internal Stress of Continuous Transition Ceramic–Metal Coating
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DOI：
10.3390/coatings12050569
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发表时间：
2022-04
期刊：
影响因子：
3.4
通讯作者：
Yousheng Zhu;Biju Zheng;Chengxu Hua;H. Pei;P. Song
中科院分区：
文献类型：
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作者：
Yousheng Zhu;Biju Zheng;Chengxu Hua;H. Pei;P. Song
热喷涂陶瓷涂层具有良好的机械性能，在工业上得到了广泛的应用。然而，传统的陶瓷涂层由于粘结涂层和陶瓷涂层之间的物理性能差异而容易失效。为了解决这一问题，在陶瓷涂层和粘结涂层之间引入连续过渡区，采用空气等离子喷涂方法制备了传统涂层和连续过渡涂层。维氏硬度分析结果表明，连续过渡区的存在使陶瓷涂层与粘结涂层之间的硬度变化更加平缓。为了了解连续过渡涂层内部的应力分布，建立了连续过渡区陶瓷与金属界面的模型。仿真分析发现，连续过渡区的存在可以显著降低涂层内部的应力梯度，且连续过渡区的梯度指数对涂层模型内部的应力分布也有很大影响。SEM（扫描电子显微镜）分析发现涂层内部存在大量孔隙;对孔隙进行建模并模拟孔隙对涂层内应力的影响，结果表明涂层内部孔隙的存在可以降低界面处的应力梯度。
Thermal-sprayed ceramic coatings are widely used in industry due to their favorable mechanical properties. However, traditional ceramic coatings are prone to failure due to the differences in physical properties between the bonding coating and the ceramic coating. In order to solve this problem, a continuous transition zone was introduced between the ceramic coating and the bonding coating, then air plasma spraying was used to prepare traditional coatings and continuous transition coatings. The Vickers hardness analysis results show that the existence of the continuous transition zone made the change of hardness between the ceramic coating and the bonding coating more gradual. To understand the stress distribution inside the continuous transition coating, models were established to express the interface between ceramic and metal in the continuous transition zone. Simulation analysis found that the existence of the continuous transition zone can significantly reduce the stress gradient inside the coating, and the gradient index of the continuous transition zone also has a great influence on the stress distribution inside the coating model. SEM (Scanning Electron Microscope) analysis found many pores inside the coating; modeling the pores and simulating the influence of pores on the internal stress of the coating showed that the existence of pores inside the coating can reduce the stress gradient at the interface.