Nasir, Muhammad Anas <br/><br/>
Tribological Performance Analysis of Grey Cast-Iron against 52100 Steel Ball Bearing with Poly-alpha olefin Lubricant with Nano Additives under Reciprocating Motion / 
Muhammad Anas Nasir 
 - 70p.  Soft Copy  30cm 
<br/><br/> This study is based on nano-particle based lubricants and their role in enhancement of<br/>tribological performance of base oil. CuO, ZnO and MoS2 nanoparticles are added to<br/>PAO-10 in 1wt% concentration along with 2wt.% oleic acid as a dispersant, these three<br/>mixtures are then set up for testing with a tribo-pair of ASTM-52100 steel ball and SAEJ431 (G-3000) gray cast iron. The tests are carried out on a computer controlled<br/>reciprocating tribometer and all the lubricants are subjected to 10N, 20N and 30N loading<br/>conditions. Test duration is 7200 seconds, at 50 rpm and ambient temperature. Under<br/>these conditions and a sliding point contact the test rig is designed to test lubricant<br/>performance under boundary lubrication regime. To study the wear scar, a digital optical<br/>microscope was used and dimensions for each wear scar were recorded along with the<br/>surface roughness before and after the testing.<br/>The reciprocating tribometer tests were also conducted on SAE-40 and SAE-0W20 fully<br/>formulated oils to compare the results with nano-particle based lubricants. The results<br/>from the tribometer tests suggest that ZnO nanoparticles showed positive results by<br/>slightly improving CoF values and showed a significant reduction in wear volume. CuO<br/>nanoparticles showed improvement in CoF values for lower loading conditions but could<br/>not improve performance for higher loading conditions. The MoS2 nanoparticles were<br/>observed to be most effective in reducing the CoF and wear scar volume when added to<br/>PAO-10. The lowest CoF value was observed with PAO+MoS2 at 20N load, which is a<br/>93% improvement as compared to PAO-10. The lowest value for wear scar volume was<br/>observed for PAO+MoS2 at 10N load which was 92% improvement as compared with<br/>PAO-10 only.<br/>This study further discusses the mechanism that physically changes the sliding conditions<br/>and play part in reducing the CoF and wear due to presence of nanoparticles and tries to<br/>relate them with the results of this study. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MS Mechanical Engineering      
<br/><br/><label>Dewey Class. No.: </label>621