Materials Science of Wear-Protective Nanostructured Thin Films

摘要: Nano-design routes for ceramic thin films by PVD are reviewed. For TiN/NbN superlattices, glide within the layers is dominant deformation mechanism in support of models superhardening. Theory presumes plasticity with dislocation hindering at interfaces between phases different shear modulus. It shown that superlattices exhibit crystal rotation near an indent, scratch or wear zone. A concept age hardening metastable coating materials presented Ti-Al-N system. Spinodal decomposition coherent cubic-phase nm-size domains thus demonstrated, causing increase hardness during annealing. Finally, inherently nanolaminated hexagonal Mn+1AXn-phases considered (n=1,2,3; M=transition metal; A-group element; X=C/N). These combine and metallic properties. MAX film form reported, including Ti3SiC2 Ti2AlN. Nanoindentation combined electron microscopy reveals kink formation cohesive delamination on basal planes these ductile materials.