Tribological properties study of spherical calcium carbonate composite as lubricant additive

Tribological properties of the spherical CaCO3 composite as additive to machine oil were evaluated with a three-ball tester. The composite with the average diameter of about 4 μm was synthesized by taking an amphiphilic copolymer as medium. Scanning electron microscope was used to investigate the surfaces of the lubricated steel balls in the test. The results show that the CaCO3 composite exhibit good performance in wear and friction reduction. The anti-wear improvement capability of the machine oil turn up to be the most efficient when 5 wt.% CaCO3 composite was added.