Fundamental mechanisms of coating formation
Q1. Rank the following in preference for dense and adherent coating with (i) low particle temperature, high particle velocity, (ii) high particle temperature, low particle velocity, (ii) low particle temperature, low particle velocity, and (iv) high particle temperature, high particle velocity. Explain the reasoning behind the ranking.
Q2. Why the substrate roughness does not affect the coating microstructure significantly in powder sprayed coating as in the case of SPS coating?
Q3. Imagine you get a lot of funding for your spray lab. Which of the diagnostic tools would you invest in each case (i) radial-SPS, (ii) radial-APS, and (iii) axial- SPS? Explain the reasoning behind the selection.
Title:Feedstock for thermal spraying
Q4. For a given powder cut and material, which powder morphology would result in best flow properties and why:
