Microstructural aspects of the protective ceramic coatings applied on the surfaces of refractory alloys produced by additive manufacturing

• Published in: Manufacturing review (Ulis, France) Vol. 7; p. 33
• Main Authors: Sobetkii, Arcadii, Mosinoiu, Laurentiu, Paraschiv, Alexandru, Corban, Mircea, Piticescu, Radu R., Matache, Gheorghe
• Format: Journal Article
• Language: English
• Published: Les Ulis EDP Sciences 2020
• Subjects: 3-D printers; Additive manufacturing; Adhesion; Alloying additive; Alloys; Ceramic bonding; Ceramic coatings; Ceramic glazes; Ceramics; Corrosion; eb-pvd; Electron beams; Heat conductivity; Heat resistant alloys; High temperature; High vacuum; Laser beam melting; Lasers; Morphology; ni-base superalloys; Nickel base alloys; Parallelepipeds; Protective coatings; Refractory alloys; scratch test; Scratch tests; slm; Structural analysis; Substrates; Superalloys; Thermal cycling; Thin film coatings; Yttria-stabilized zirconia; United States > US
• ISSN: 2265-4224; 2265-4224
• DOI: 10.1051/mfreview/2020031

The possibility of depositing multi layers made of metals/alloys and high temperature ceramics by electron beam physical evaporation process under high vacuum (EB-PVD) on the surface of a parallelepiped sample made by selective laser melting (SLM) from a Ni base refractory super alloy was experimentally tested. The SEM-EDAX micro structural analysis revealed the morphology and thickness of the coatings consisting of a NiCrAlY base alloy as bonding layer and three successive YSZ, LZO and GZO ceramic layers on the Ni-based super alloy substrate obtained by additive manufacturing. The adhesion of the layer deposited was evaluated by the scratch test method. The analysis highlighted the importance of pre-preparing the surface of the additive manufactured substrates, in order to control the adhesion and uniformity of the deposited layers.