Topic description

Suspension Plasma Spraying (SPS) is an emerging industrial process, particularly for the creation of ceramic coatings resistant to thermomechanical stresses, used as long-life thermal barriers for aircraft engine. For the aeronautics industry, it is classified as a special process whose output elements can only be verified by monitoring or post-measurement, and whose deficiencies therefore only become apparent once the product is in use.



In this process, a liquid suspension containing submicron particles of the material to be deposited is injected into a thermal plasma jet, where it is fragmented and evaporated. This releases individual or agglomerated submicron particles, which are subsequently accelerated and melted before impacting the surface of the part to be coated, spreading upon impact and solidifying to build up the coating.



The structure of the coating is a function of the operating conditions, from the...