Microstructure and tribological properties of Ni3Al matrix micro-laminated films deposited by electrohydrodynamic atomization

Abstract

Thispaperaimstoenhance the microstructure, mechanical properties, and tribological properties of Ni3Al matrix composite films (NMCs) and provide efficient and convenient methods for preparing Ni3Al matrix micro-laminate films. Ni3Al/Cr3C2-Ti3SiC2-MoS2 (NMCs-1) single-layer film, as well as Ni3Al/Cr3C2-Ti3SiC2-MoS2 (NMCs-2) and Ni3Al-Cr3C2-MoS2/Ni3Al-Ti3SiC2-MoS2 (NMCs-3) micro-laminated films with different layer thickness ratios were deposited on the surface of GH3044 superalloy using electrohydrodynamic atomization (EHDA). X-ray diffraction, scanning and transmission electron microcopies, and X-ray photoelectron spectroscopy were conducted to analyze and characterize the properties of these films. Results indicated that the NMCs-3 micro-laminated films exhibited denser microstructure, stronger (002) preferred orientation, and higher adhesion to the substrate, compared to the NMCs-1 single-layer film and NMCs-2 micro-laminated films. Additionally, NMCs-3 displayed superior-excellent tribological properties, the wear rate wasreducedby an orderofmagnitude than the NMCs-1 and NMCs-2 films, and the frictioncoefficient fell by 40% comparedwith the film in the previouswork. This was mainly attributed to the inhibition of crack propagation and reduction in film damage through the laminated structuredesign of the NMC-3 films.