Improving heat transfer capability and thermal stability of polyalphaolefin introducing Fe3O4/CNTs hybrid nanomaterials

To address the common problem of insufficient heat dissipation performance of lubricants in the power systems of new energy vehicles, this study investigated the physicochemical properties of Fe 3 O 4 /CNTs composite nanomaterials as an additive for PAO7 lubricating oil.The wettability and rheological properties of different nanofluids were studied.In addition, the thermal stability and thermal conductivity of the nanofluids were further evaluated. The results showed that the addition of Fe 3 O 4 /CNTs composite nanomaterials significantly reduced the contact angle with the steel interface by 42.7%. The viscosity of the nanofluids decreased slightly with increasing shear rate, exhibiting significant shear-thinning behavior. Simultaneously, the high-temperature oxidative degradation time was prolonged, showing excellent high-temperature stability. The thermal conductivity of hybrid nanolubricant (HL) was increased by approximately 11.04% compared to the base oil, significantly improving heat transfer performance. This composite nano-lubricant is expected to be applied to the cooling system of new energy vehicles, thereby improving their overall performance.