Abstract：To study the effect of far infrared nano-sized ceramic powders as lubricant additives on tribological properties, by adding the far infrared nano-sized ceramic powders into base oil with brand of 150 SN after surface modification treatment,tribological properties were studied by a four-ball friction tester.The friction coefficient and wear scar diameters of lubricants without and with far-infrared nano-sized ceramic powders were analyzed. The mechanism of friction and wear was explored. The results show that the friction coefficients of base oil and far infrared nano-sized ceramic powders lubricant have little difference at initial stage. The friction coefficient of far infrared nano-sized ceramic powders lubricant begins to reduce in the late stage of friction tests, which is far less than the friction coefficient of base oil. The average friction coefficient of far infrared nano-sized ceramic powders lubricant decreases first and then increases with the increase of additive amount of far-infrared nano-ceramic powders. When the additive mass fraction of far-infrared nano-sized ceramic powders is 1.0%, the average friction coefficient of the lubricant achieves the minimum, and its change rate relative to the base oil reaches-31.6%. The wear scar diameters of far infrared nano-sized ceramic powders lubricant are much less than those of the base oil, the wear scar diameter achieves the minimum when the additive mass fraction of far-infrared nano-sized ceramic powders is 1.0%.

Keywords: far-infrared nano-sized ceramic powder; surface modification; base oil; additive; tribological property