MAX phase compounds offer an attractive mixture of ceramic–metallic properties due to their covalent ionic–metallic nature. Since their discovery, a great interest was attributed to their synthesis and potential applications, but the processing of pure compounds as coatings for industrial large-scale application is still considered a challenge. To date, a limited number of papers have evaluated the build-up of MAX phase coating by cold spray (CS), a novel cost-effective and productive spray technology used in both areas of research and industry. Employing CS, the hot gas-propelled material particles have ballistic impingement on a substrate where they undergo plastic deformation. Because of the brittleness, internal delamination, and limited deformability, the deposition of the pure MAX phase is rather challenging. This paper presents the building-up ability of dense MAX-phase coatings by CS with retained structures and compositions, in close relation with the substrate characteristics and phase composition that influences the dual character ceramic–metallic behaviour. Besides recent literature, the originality of this research consists of pioneering deposition of Ti₃AlC₂ that emphasizes the ceramic–metallic character influenced by the particle speed and the mechanical properties of both substrate and compound.

Suite à la pandémie de la Covid-19, un effort considérable est actuellement déployé, tant dans la recherche académique que dans le secteur industriel, pour élaborer des revêtements capables de protéger les surfaces contre les microorganismes et ainsi limiter leur temps de résidence, leur développement et par suite leur transmission. Dans le cadre d’une collaboration interdisciplinaire IRCER, E2Lim et Sanodev, ce travail s’intéresse à la fonctionnalisation d’une surface par le biais d’un revêtement biocide non toxique et photocatalytique capable d’inhiber la croissance des microorganismes. Dans ce but, les potentielles propriétés bactéricides vis-à-vis de Escherichia coli de différents revêtements élaborés par projection plasma (photocatalytiques et non photocatalytiques) ont été évaluées.