In this study, a nanoscale ionic liquid (NIL) GO@SiO₂ hybrid was synthesized by attaching silica nanoparticles onto graphene oxide (GO). It was then functionalized to exhibit liquid-like behavior in the absence of solvents. The physical and chemical properties of the synthesized samples were characterized by means of a transmission electron microscope, X-ray diffraction, Fourier transform infra-red, Raman spectroscopy, and thermogravimetric analysis. The tribological properties of the NIL GO@SiO₂ hybrid as a water-based (WB) lubricant additive were investigated on a ball-on-disk tribometer. The results illustrate that the NIL GO@SiO₂ hybrid demonstrates good dispersity as a WB lubricant, and can decrease both the coefficient of friction (COF) and wear loss.

In this paper, an alternative approach was developed for the form-finding of cable-membrane structures. The prestress of a triangular finite element was firstly equivalent to the axial force densities and uniform vertical loads on the three edges. The static equations and tangent stiffness matrices of the cable-membrane were then formulated with the aid of the nonlinear force density method. In order to obtain a high accurate surface of cable-membrane structures, an iterative strategy was presented to solve the nonlinear force density equations and optimize the initial geometrical shape based on the Newton-Raphson method. Eventually, the proposed method was applied to the form-finding of the cable-membrane structure, a hoop truss antenna, and a numerical example was conducted to confirm the efficiency of the method.

Indefinite chill (IC) roll and high speed steel (HSS) materials have been widely employed to manufacture work rolls as latter and former stands in hot rolling mills. The oxidation of work rolls is of importance for the surface quality of the rolled workpieces. The isothermal oxidation of the IC and HSS materials was conducted at 650 °C and 700 °C in both dry air and humid air. The isothermal oxidation curves indicate that HSS shows faster kinetics than the IC materials in dry air, whereas the opposite occurred in humid air. The oxide scales of the IC materials after the oxidation in both dry air and humid air are made up of two oxide phases. Two oxide phases were found when the HSS oxidized in the dry air and three oxide phases were found when oxidized in the humid air.

The adoption of lubricants in metal forming processes at high temperatures holds particular significance. This practice facilitates reducing friction and wear, enhances metal formability, prevent seizure and galling, and extends tool life. However, elevated temperatures cause changes in lubricant properties, making it difficult to maintain effective lubrication. These changes may negatively affect the quality and efficiency of the forming process. Given the severity undergone at high temperatures, several solid inorganic salts are reported as an alternative to exhibit favourable lubrication performance. In this study, the lubrication performance of environmentally friendly albite (NaAlSi ₃ O ₈ ) was evaluated through ball-on-disc tests at elevated temperatures ranging from 550 to 950°C. The results demonstrate that albite can effectively decrease friction and wear loss across the tested temperature range, with a more pronounced effect at higher temperatures (890 and 950°C). The high-temperature lubrication mechanism of albite is attributed to the formation of a thick layer containing Na, Si, and O elements within the tribo-interface, which prevents direct contact between rubbing surfaces.