◄   cover

T1 coating, nano-suspension

Source [1]   full size

Suspension And Particle Transport In Suspension Plasma Spray (SPS)

Partners

  • Medraj, M
  • Oberste-Berghaus, J.

Project description

A suspension of nano-particles, with agglomerates, is injected into plasma jets. Suspension is the only way to inject such small particles with the suitable momentum. in APS, these particles would require carrier gas flow rates as high as 50 slm, which hugely perturb the plasma jet. The result is a fragmentation of the plasma droplets containing solid particles. After evaporation, the solid particles are melted and projected onto a prepared substrate

The SPS method presents the following advantages:
– the control of the coating porosity by adjusting the experimental parameters
– it enables multi-layer deposition gradient properties (composition, porosity…) using one or more suspensions
– working in embiant air with minor modifications of conventional plasma spraying system

◄   FIGURE 1

Schematic of suspension plasma spray process

Source: TSMF
full size

◄   FIGURE 2

60/40 wt.% alumina/zirconia suspension plasma-sprayed coatings (a, b) coatings at 100×. (c, d) Same coatings as (a, b), respectively at 2000×

source [2]
full size

References

  • [1] Curry, N., VanEvery, K., Snyder, T., Susnjar, J., & Bjorklund, S. (2015). Performance testing of suspension plasma sprayed thermal barrier coatings produced with varied suspension parameters. Coatings, 5(3), 338-356.
  • [2] Tarasi, F., Medraj, M., Dolatabadi, A., Oberste-Berghaus, J., & Moreau, C. (2008). Effective parameters in axial injection suspension plasma spray process of alumina-zirconia ceramics. Journal of Thermal Spray Technology, 17(5-6), 685-691.