Mechanism of graphene lubricating oil cooling effect on Si 3 N 4 -GCr 15 friction pair
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ORIGINAL
Mechanism of graphene lubricating oil cooling effect on Si3N4-GCr15 friction pair Li-Xiu Zhang 1,2 & Da Teng 1 & Yu-Hou Wu 1 & Li-Yan Wang 1 & Dong-Ping Song 1 Received: 15 July 2019 / Accepted: 13 March 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Si3N4-GCr15 (silicon nitride-bearing steel) friction pair is often used in high-speed bearings. The molecular dynamics model of graphene additive lubricating oil (mixed oil) is developed to study the effect of graphene as a nano lubricant additive on the thermal conductivity of the lubricating oil. With the research temperature range of 298~532 K, the results of internal molecular dynamics simulation show that the thermal conductivity of mixed oil increases with the increase in the graphene mass fraction at 298 K. When the temperature is higher than 298 K, the thermal conductivity of the mixed oil increases first and then decreases with the increase of the graphene mass fraction. When the mass fraction of graphene is constant, the thermal conductivity of the mixed oil increases first and then decreases with the increase of temperature. An experiment was designed to investigate the heat transfer coefficient for mixed lubricating oil at test specimen surface. Experiments show that an appropriate amount of graphene is added to improve the convective heat transfer between the lubricating oil and the test piece. However, as the amount of graphene added increases, the viscosity of the mixed oil increases, thereby inhibiting the fluid flow behaviour, resulting in a decrease in the convective heat transfer coefficient. This shows that only an appropriate amount of graphene additive has a cooling effect on Si3N4-GCr15 friction pair.
1 Introduction Ceramic materials are used in bearings because of their high rigidity, wear resistance, corrosion resistance, high temperature resistance, low density, and high elastic modulus. However, these materials have low thermal conductivity, weak tensile strength, and poor plasticity and toughness. The thermal properties of ceramic materials result in stable chemical and physical properties of ceramic bearings at high temperature; however, the low thermal conductivity leads to the deposition of heat at the ball and outer wall of the bearing. Consequently, the local temperature continues to rise until the bearing is damaged. Therefore, it is of great significance to strengthen the heat conduction performance of ceramic bearing components and derive heat through the oil and gas
* Da Teng [email protected] 1
School of Mechanical, Shenyangjianzhu University, Shenyang 110168, China
2
Analysis and Testing Technology Research Center, Shenyang Jianzhu University, Shenyang 110168, China
lubrication system. The concept of nanotechnology was introduced by physics Nobel laureate Richard P Feynman in his famous lecture entitled ‘There’s plenty of room at the bottom’ at the December 1959 meeting of the American Physical Society. Since then, nanoparticles and nanotechnology have been widely used in areas such as
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