Effects of Ni3Al matrix bio-inspired shell-like composite surface structure on interfacial tribological behaviors.

In this work, the tribological performance and the friction- induced vibration and noise (FIVN) of Ni 3 Al matrix bio-composite surface structures (NMCSS) with different surface texture densities were studied. NMCSS was inspired by biological characteristics and composed of Ni 3 Al alloys and Sn3.0Ag0.5Cu (SAC305) alloys. The results show that the friction film can be formed on the contact surface of NMCSS samples to improve the tribological performance and suppress the FIVN behaviors. However, the surface texture density has the positive impacts on the thickness of friction film, which results in the different tribological performance. The possible relations between the interfacial tribological characteristics of NMCSS and the self-excited vibration have been confirmed by the numerical simulation. It demonstrates that the thickness of friction film on the contact surface can alleviate effectively the occurrence of self-excited vibration. This investigation help us understand the FIVN generation and provide a potential surface design strategy for the engineering application. [Display omitted] • The bio-inspired shell-like composite surface structure is designed. • Effect of surface texture density on the thickness of friction film and the FIVN signals is studied. • The FIVN generation of friction system is studied. • The relationship between the friction film and the self-excited vibration is investigated by the experiments and the numerical analysis. [ABSTRACT FROM AUTHOR]