Abstract
The tribological properties of zinc oxide (ZnO) and 12% calcium doped zinc oxide nanoparticles (ZCOs) have been investigated by performing standard tests, ASTM D4172 and D5183on a four-ball tester. All the nanoparticles were synthesized through auto combustion method. Calcium doped zinc oxide nanoparticles of different size were prepared by varying the calcination temperature as 600 °C (ZCO-1) and 1000 °C (ZCO-2) respectively. The synthesized nanoparticles have been characterized by different techniques such as powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM) coupled with energy-dispersive X-ray (EDX). Incorporation of calcium as a dopant was found to enhance the antiwear and antifriction behavior of the ZnO nanoparticles. The nanoparticles ZCO-1 with smaller size, 25 nm provided much better results as compared to ZCO-2, 35 nm. Furthermore, a stable suspension of the synthesized nanoparticles was prepared with an anionic sodium dodecylsulphate surfactant (0.25% w/v with 0.1% SDS) which increased substantially the antiwear properties and reduced simultaneously the friction between moving metal surfaces. Thus, the enhanced tribological properties may result in the commercial deployment of these nano-lubricants in lubrication industries.
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