Research on the Thickness of the Friction Layer of Ni3Al Matrix Composites with Graphene Nanoplatelets

Abstract

Dry sliding tribological tests of Ni 3 Al matrix composites (NMCs) with/without graphene nanoplatelets (GNPs) under different working conditions are undertaken in this article. The results show that GNPs in NMCs make a major contribution to the formation of the friction layer, which is responsible for the reduction of the friction coefficient and improvement of wear resistance. In addition, with the increase in the sliding velocity and normal load, the friction coefficient decreases to a stable value and the wear rate increases to a stable value. This article also examines the possibility of describing the formation of the friction layer during the sliding process. The formation of the friction layer can be divided into two processes: the formation of the fine grain layer and the material loss of the surface layer. The strain rate intensity factor is used to describe the formation of the fine grain layer, and the functional relation of the material loss of the surface layer is obtained by the experimental data. As a result, a specific formula for calculating the thickness of the friction layer of NMCs with GNPs is found.

Effect of the micro-structure evolution of friction layer on the sliding tribology behavior of TiAl-10 Wt.% Ag at 16 N-0.5 m/s

“…In recent years, more attention has been paid to the micro-structure evolution of wear scar subsurface (MEWSS) exploring the friction and wear behaviors of TiAl-10 Wt.% Ag (Wang et al , 2013; Zhu et al , 2015; Yang et al , 2015). Wang et al (2013) investigated the formation mechanism of nanocrystalline structure, and found that MEWSS was beneficial to the lowering of friction coefficients and wear rates.…”

“…Wang et al (2013) investigated the formation mechanism of nanocrystalline structure, and found that MEWSS was beneficial to the lowering of friction coefficients and wear rates. Zhu et al (2015) studied the friction and wear behaviors of Ni 3 Al-graphene, and found that solid lubricant multilayer graphene caused the formation of friction layers, resulting in lower friction coefficients and less wear rates. Many tribological researchers such as Shi et al (2013) and Yang et al (2015) explored the friction and wear behaviors of TiAl-10 Wt.% Ag.…”

Effects of sliding speed and testing temperature on the tribological behavior of a nickel-alloy based solid-lubricating composite

“…Zhu et al [22] and Tyagiet et al [23] discussed the influence of velocity and load on the frictional behavior of Ni 3 Algraphene and Nickel-alloy-silver-hBN composites. The results showed that the friction coefficient of the composite decreased with increasing speed and load during the dry sliding process, whereas the wear rate increased magically.…”