In order to improve the limit PV value of friction pair material,avoid severe wear failure of lubricating surface under extreme conditions such as startup and stop,and improve the reliability and service life of parts,the experimental study on the limit PV value of oillubricated micropored SiC surface was carried out.Considering the cavitation effect,the lubrication state of smooth surface,circlepored surface and ellipsepored surface was analyzed respectively,and the pressure distribution on the micropored surface was obtained.The friction coefficient,temperature and surface wear morphology were measured,and the critical speed of wear failure and the limit PV value of the micropored surface under different load conditions were obtained.The results show that the micropored surface presents a tendency to increase the limit PV value of SiC friction pair,and the maximum increase of average limit PV value is more than 70%,and the maximum increase of the limit PV value of friction pair by ellipsepored surface is more than 2 times.The limit PV value of the micropored surface fluctuates significantly and is uncertain with the change of load conditions.Under the condition of boundary lubrication,the micropored surface may show the effect of reducing friction,and also may cause the phenomenon of increasing friction.In the test,the circular micropored surface can reduce the limit PV value of the friction pair by more than 60%.