Systematic Investigation on the Influence of Spray Parameters on the Mechanical Properties of Atmospheric Plasma-Sprayed YSZ Coatings
Systematic Investigation on the Influence of Spray Parameters on the Mechanical Properties of Atmospheric Plasma-Sprayed YSZ Coatings
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DOI：
10.1007/s11666-018-0697-z
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发表时间：
2018-04
影响因子：
3.1
通讯作者：
M. Mutter;G. Mauer;R. Mücke;O. Guillon;R. Vaßen
中科院分区：
文献类型：
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作者：
M. Mutter;G. Mauer;R. Mücke;O. Guillon;R. Vaßen
在大气等离子喷涂(APS)过程中，微小尺寸的陶瓷粉末被注入到热等离子体中，在那里它被快速加热并推向衬底。涂层形成的特征是随后大量或多或少形成所谓碎片的熔融颗粒的撞击，并最终形成涂层。本文系统地研究了喷涂工艺参数对涂层组织和性能的影响。因此，研究包括涂层孔隙率、弹性模数和涂层内残余应力的演化。颗粒在撞击基片时的熔融状态以及基片的表面状况对涂层的形成至关重要。在选定的喷涂条件下，在镜面抛光的基板上收集单片，并通过识别不同类型的片(理想、扭曲、弱结合和部分熔化)及其相对比例进行评估。在先前的一项研究中，根据它们对上述涂层性能的影响来评估这些飞花类型。粒子的熔融状态是衡量粒子扩散行为的一个指标，它是通过动态测量粒子温度来确定的，并与涂层的性能相关联。结果表明，喷枪功率和喷涂距离对涂层性能有较大影响，而进给量和冷却时间对涂层性能影响较小。
In the atmospheric plasma spray (APS) process, micro-sized ceramic powder is injected into a thermal plasma where it is rapidly heated and propelled toward the substrate. The coating formation is characterized by the subsequent impingement of a large number of more or less molten particles forming the so-called splats and eventually the coating. In this study, a systematic investigation on the influence of selected spray parameters on the coating microstructure and the coating properties was conducted. The investigation thereby comprised the coating porosity, the elastic modulus, and the residual stress evolution within the coating. The melting status of the particles at the impingement on the substrate in combination with the substrate surface condition is crucial for the coating formation. Single splats were collected on mirror-polished substrates for selected spray conditions and evaluated by identifying different types of splats (ideal, distorted, weakly bonded, and partially molten) and their relative fractions. In a previous study, these splat types were evaluated in terms of their effect on the above-mentioned coating properties. The particle melting status, which serves as a measure for the particle spreading behavior, was determined by in-flight particle temperature measurements and correlated to the coating properties. It was found that the gun power and the spray distance have a strong effect on the investigated coating properties, whereas the feed rate and the cooling show minor influence.