Abstract: CNT-Ag-G composite brushes are fabricated by means of powder metallurgy, and the effect of the electrical current on the electrical wear properties of CNT-Ag-G composite is studied. The process includes pressing at 200 Mpa, sintering for 1 h in pure H2 protective atmosphere and repressing at 400 Mpa. The results show that with the increase of the electrical current, the adhesion wear aggravates, the lubrication film gets damaged, and finally the friction coefficient and the wear mass loss both become bigger. The wear mass loss of the positive brush is more than the loss of the negative brush because of the physical and chemical reaction on the interface and the existence of the metal transference. The wear mass loss of the positive brush multiplies with the increase of the electrical current, but the loss of negative brush has little relation with the electrical current. The bigger the electrical current is, the more different between the wear mass loss of the two brushes is.

Key words: CNT-Ag-G composite, Electrical current density, Friction factor, Wear mass loss