Abstract
In this article, molybdenum particles were plasma sprayed on copper, zirconia, and glass substrates. The impact of the molten particles was monitored using a fast two-color optical fiber pyrometer focused on a small spot on the substrate surface. The apparent duration of the flattening process and the cooling speed, both determined from the pyrometer signals, were found to depend on the substrate conditions and to vary with coating thickness. The substrate material and its roughness were also found to influence the texture in the sprayed coatings. Furthermore, a transient thermal flow numerical model was used to compute reliable thermal histories of the impinging particles and the underlying lamellae, the interfacial thermal resistance being determined by comparison of experimental thermograms with computed ones.
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Moreau, C., Cielo, P. & Lamontagne, M. Flattening and solidification of thermally sprayed particles. JTST 1, 317–323 (1992). https://doi.org/10.1007/BF02647159
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DOI: https://doi.org/10.1007/BF02647159