Method for realizing long-time dispersion stability of Al2O3 nano particles in lubricating oil

The invention provides a method for realizing long-time dispersion stability of Al2O3 nano particles in lubricating oil. The method comprises the following steps: S1, adding oleic acid into lubricating oil, and stirring the oleic acid through a dispersion machine; S2, adding Al2O3 nano particles into a mixed oil solution composed of the oleic acid and lubricating oil, and performing an ultrasonictreatment on the mixed oil solution by first ultrasonic equipment; S3, stirring the mixed oil solution through magnetic stirring; S4, performing a sufficient ultrasonic treatment on the mixed oil solution in the step S3 by second ultrasonic equipment, controlling the temperature range of the mixed oil solution to be between 40 DEG C and 60 DEG C by adopting a constant-temperature water bath in theultrasonic process, performing surface modification on the Al2O3 nano particles, and uniformly dispersing the Al2O3 nano particles into the mixed oil solution; and S5, after the ultrasonic treatmentis completed and the mixed