Plasma co-spraying of NiCrAlY powder and alumina suspension for anti-wear coatings
Alice Ravaux* / SPCTS, France Alain Denoirjean / SPCTS, France Christophe Chazelas/ SPCTS, France Stéphane Valette/ SPCTS, France Hélène Ageorges/ SPCTS, France Erick Meillot/ CEA, France Luc Bianchi/ CEA, France
There is an increasing need for coatings with high wear-resistance for long-term and reliable service at high temperatures in various industrial applications: aeronautics, automobile, energy and tooling industry... The tailoring of innovative architectures at the nanoscale is a potential way to improve the wear performance of coatings and meet demanding application requirements.
This study examines how to achieve composite coatings with a metal alloy matrix reinforced with nano- or micro-sized ceramic particles. The latter are used to change the wear resistance of the metal matrix composite coating.
The plasma spray process is based on the simultaneous spraying of a NiCrAlY powder with particle size ranging between 17 and 37 µm and nano-sized alumina particles. The first powder is injected in the plasma jet by using a carrier gas while the later is injected under the form of a suspension consisting of organic solvent containing nanoparticles and dispersing agents. The effect of the process operating parameters on coating microstructure and mechanical properties is investigated and discussed.