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Nanometer lanthanum borate was prepared by ultrasonic-assisted chemical precipitation. X-ray diffraction and a laser particle size analyzer were used to study the heat treatment temperature on the micro-structure of the nanoparticles, and the tribological properties of nanoparticles were explored for friction and wear using a MMU-10G testing machine. The results show that the heat treatment temperature not only determines the crystallization degree and crystal type of nanometer lanthanum borate, but also greatly affects the anti-friction and wear-resistance properties of the base oil. When the heat treatment temperature is between 300°C and 600°C, amorphous La2[B4O5(OH)4]3 nanoparticles are formed. Featuring strong chemical activity, adsorption on the friction surface, and a significant anti-wear self-repair effect, the nanoparticles can promote the formation of a tribochemical reaction film. When the heat treatment temperature exceeds 900°C, the particle size distribution in the bed becomes broader and shifts to a larger size. Hard-phase crystal LaBO3 and B2O3 particles are formed, which intensifies the abrasive wear and the tribological properties are reduced.

Effect of heat treatment temperature on the structure and tribological properties of nanometer lanthanum borate