Abstract
A composite layer of gradient nanocrystals and LaFeO3 perovskite oxide was prepared. The influence of the composite layer on the diffusion of carbon atoms and the change of wear mechanism was studied. The experimental data and related mechanisms show that the formation mechanism of gradient nanocrystalline layer mainly involves dislocation slip and strain gradient evolution at grain boundaries. The oxygen vacancies provided by nano oxides improve the surface activity of the samples and promote the diffusion of carbon to deep layers. The existence of composite layer changes the wear mode of different depths. The oxide film formed on the surface promoted by rare earth provides the effect of anti-wear and lubrication. Oxygen vacancies improves the anti-spalling ability of oxide film.
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