Preparation and tribological properties of hybrid nanofluid of BNNs and SiC modified by plasma

Aviation superalloy is widely used in aviation parts because of its high temperature strength and good fatigue resistance. Due to its high yield strength and low thermal conductivity, it is easy to produce lots of heat during processing, and its hardening tendency is serious, in the case of insufficient cooling lubrication easy to cause burns and poor processing quality. However, the traditional coolant has insufficient cooling performance, which is difficult to solve the thermal problem of aviation superalloy processing. In order to solve these problems, this paper uses plasma hydroxyl modified hexagonal boron nitride nanosheets (BNNs) and silicon carbide (SiC), and then adds sodium dodecyl benzene sulfonate (SDBS) in deionized water to prepare water-based BNNs/SiC hybrid nanofluid. The method of improving dispersion stability was studied by experimental means, and a single factor experiment was designed to study the influence law of mass ratio, mass concentration and temperature on heat transfer performance. Then the tribological properties of the formula were verified by friction and wear test. The results show that the Zeta potential of the nanofluid prepared by plasma hydroxyl modification is greatly improved, and the nanoparticles are effectively dispersed in the water-based liquid under the action of electrostatic stability mechanism. The viscosity reaches a minimum of 0.36249mPa & sdot;s, and the thermal conductivity reaches a maximum of 0.99496 W/(m & sdot;K). BNNs and SiC particles produce a synergistic structure like the rolling bearing due to the interface effect, which greatly enhances the anti-wear and anti-friction effect of the base fluid. The average friction coefficient is reduced to 0.068, and the volume wear rate is 37.03%, 30.8% and 69.35% lower than the traditional coolant, BNNs nanofluid and SiC nanofluid, respectively.