The development of thick pure copper coatings on SS316 substrates with desired properties for Tokamaks is still a challenging task. The solution to this task can help to fulfill the demanding requirements of in-vessel materials for plasma passivation. In the present work, the effect of substrate surface roughness on several properties of cold-sprayed copper coatings was investigated. Effect of post-heat-treatment on the properties of the developed coatings was also studied. The developed coatings were characterized using various techniques viz.; scanning electron microscopy/energy dispersive spectroscopy, X-ray diffraction, optical microscopy, microhardness, nanoindentation, electrical and thermal conductivity measurements, and density and porosity analyses. The novelty of the article includes in-situ micro-tensile testing of the developed coatings to understand their fracture mechanism, which showed multi-crack failure. Moreover, the cracks were found to be originating from the multi-splat boundary junctions, followed by growth along the splat boundaries. Additionally, γ-rays and heavy-nuclei irradiation along with thermal cyclic exposure studies were also performed to elucidate the actual environmental performance of the coatings. The coatings developed on the mirror-finished surface were found to have better mechanical and physical properties as compared to the coatings developed on the rough substrate surface; prior as-well-as post-heat-treatment.

在SS316基体上开发厚实的纯铜涂层以达到托卡马克所要求的性能仍然是一项艰巨的任务。该任务的解决方案可以帮助满足用于等离子体钝化的车载材料的苛刻要求。在目前的工作中，研究了基材表面粗糙度对冷喷涂铜涂层几种性能的影响。还研究了后热处理对显影涂层性能的影响。使用多种技术对显影的涂层进行表征。; 扫描电子显微镜/能量色散光谱，X射线衍射，光学显微镜，显微硬度，纳米压痕，电导率和导热率测量以及密度和孔隙率分析。文章的新颖性包括对已开发涂层进行原位微拉伸试验，以了解其断裂机理，从而显示出多裂纹失效。此外，发现裂纹起源于多板边界连接处，然后沿板边界生长。此外，还进行了γ射线和重核辐射以及热循环暴露研究，以阐明涂层的实际环境性能。与在粗糙的基材表面上形成的涂层相比，发现在镜面表面上形成的涂层具有更好的机械和物理性能。之前以及之后的热处理。