A multi-physical signal correlation analysis method is proposed to identify the different tribological properties of materials. The acoustic emission (AE), contact resistance, and frictional force behaviors during dry sliding between four metals, 45# carbon steel, YG12 carbide, 2A12 aluminum alloy, and H62 brass, have been studied. Both positive and negative correlations between the root mean square of the amplified AE (AE RMS) signal and the frictional coefficient have been found in the expe...

Rotational speed stability is an important evaluation indicator of the performance of a hydro-viscous clutch (HVC). To improve the rotational speed stability of HVCs in mixed lubrication and the running condition of the friction pairs, the speed stability of an HVC in mixed lubrication was studied. To this end, the friction coefficients of both copper-based and paper-based friction pairs were experimentally tested using an MM1000-III wet friction machine. Theoretically, a torsional vibration ...

A new conductive grease was synthesized using a nanometer powder, i.e., Sb doped SnO₂ (ATO), as an additive. The typical properties of this new conductive grease were investigated in detail. The results indicate that ATO can dramatically improve the dropping point and reduce contact resistance. The tribological properties of the new conductive grease were investigated using the MFT-R4000 reciprocating friction and wear tester. The tribol-test results indicate that ATO can dramatica...

Damage to a glass surface by sandblasting has a remarkable effect on its mechanical properties and strength. In this study, we analyze the superficial deterioration of soda-lime glass and its influence on the mechanical strength. Sandblasting by gravitation from a fixed height causes damages by the free fall of different quantities of sand, which we performed for a selected grain size and at different angles of inclination. To characterize the surface state, we used different roughness measur...

The development of a phenol formaldehyde/graphene (PF–graphene) composite coating with high performance is desirable but remains a challenge, because of the ultrahigh surface area and surface inertia of the graphene. Herein, we synthesized PF–graphene composites by the in situ polymerization of phenol and formaldehyde with the addition of graphene oxide, resulting in improved compatibility between the graphene and phenolic resin (PF) matrix and endowing the phenolic resin with good the...