Thermal spray is one of the most widely used coating techniques to improve wear, surface fatigue or corrosion properties. In the atmospheric plasma spray (APS) process, a powdered material is melted by hydrogen and argon combustion and is propelled at high speed onto the target substrate. The high impact energy of the particles produces a dense and resistant coating layer. Mechanical and surface properties of the obtained coating depend on various spraying parameters, such as gas flow, traverse speed and spraying distance, among others. In this research, the influence of these manufacturing parameters on the thickness, hardness and resistance of the coating obtained from a Ni-Al alloy sprayed onto an aluminum alloy substrate was studied. In order to analyze the effect of these parameters on the coating properties, an extensive experimental program was carried out. A metallographic analysis, hardness and strength measurements were carried out using the small punch test to locally study the mechanical properties of the coating surface. The design of experiments and the response surface methodology facilitate the assessment of the optimal set of spraying parameters.

中文翻译：

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大气等离子喷涂参数（APS）对铝合金基体上Ni-Al涂层力学性能的影响

热喷涂是改善磨损，表面疲劳或腐蚀性能的最广泛使用的涂层技术之一。在大气等离子喷涂（APS）工艺中，粉末状材料通过氢气和氩气燃烧而熔化，并高速推进到目标基板上。颗粒的高冲击能产生致密且坚固的涂层。所获得的涂层的机械和表面性质取决于各种喷涂参数，例如气流，横移速度和喷涂距离等。在这项研究中，研究了这些制造参数对喷涂到铝合金基板上的Ni-Al合金获得的涂层的厚度，硬度和电阻的影响。为了分析这些参数对涂层性能的影响，进行了广泛的实验程序。使用小冲孔试验进行金相分析，硬度和强度测量，以局部研究涂层表面的机械性能。实验设计和响应面方法有助于评估最佳喷涂参数集。