Abstract:Spinel has good chemical stability,wear resistance,corrosion resistance,low thermal expansion coefficient,good insulation properties.The tribological performance of the porous structure of the spinel was tested under different lubrication conditions with the micro wear test machine,and the wear surface was observed by scanning electron microscope and energy spectrometer.The results show that the micro wear mechanism of MgAl2O4 ceramic is mainly brittle spalling and adhesive wear,there is element migration in sliding process between porous MgAl2O4 ceramics and Si3N4 ball.The pore structure of MgAl2O4 ceramic can play a role in storing lubricant,so that porous MgAl2O4ceramic has the selflubricating function in the process of friction and wear.Comparison with dry friction,the friction coefficient can be effectively reduced by the lubricants of poly alpha olefin (PAO oil) and the PAO oil containing carbon nanotubes poly alpha olefin (PAO+CNT).The friction reducing effect is more obvious by PAO+CNT lubricant,the average friction coefficient is decreased to 0.124 from 0.646 in dry friction,and the falling proportion reaches 80.8%.