In order to make the dynamic friction coeffcient more precise, the experiments of all the different test parameters were repeated 9 times, and the average of 9 experimental data was fnally taken for further analysis. The change in the thickness of samples was measured after a continuous braking cycle of 500 times under the conditions of the contact pressure of 0.5 MPa and the rotational speed of 2000 rpm to calculate the wear rate of samples. The wear rate is calculated as follows