Coupling powder bed additive manufacturing and vapor phase deposition methods for elaboration of coated 3D Ti-6Al-4V architectures with enhanced surface properties

We propose an innovative process coupling powder bed additive manufacturing by Electron Beam Melting (EBM) with Chemical Vapor Deposition (CVD) and Atomic Layer (ALD) to develop 3D Ti-6Al-4V structures covered AlN coating. Despite of the high reactivity nitrogen, thick (~10 ?m) conformal films are deposited CVD on substrates surface roughness. An under-layer ALD is necessary mitigate reaction between nitrogen precursor NH3(g) limit formation brittle titanium nitride phases. have thus achieved adherent coating without any modification microstructure at core substrate. show that a 7 ?m efficient in protecting against cyclic oxidation 650 °C for least h. This study opens new opportunities design coated use temperature oxidizing environments.