Abstract: The load dependency of sliding friction behavior in SiC-particulate reinforced 6061 aluminum alloy against carbon matrix composite is investigated, on a disk-block type friction tester, under sliding velocity 30 m/s and normal load (pressure) range from 0.1 Mpa to 0.8 Mpa. Effects of pressure on the randomly undulating behavior of friction coefficient, the transition behavior in initial stage of friction process as well as the state of frictional surface are observed and analyzed. Discussions are focused on laws with respected to pressure pn of the mean mav, the normal deviation s of friction coefficient in relatively steady period, as well as the time of transition period t* and the initial value m0. The results showed that with pn increasing t* linearly reduces, m0 essentially remains constant, mav changes with non-monotone form, which quickly increasing in range of pn < 0.25 Mpa and slowly reducing when pn larger than this pressure, and s appears similar tendency changing with mav.

Key words: Aluminum matrix composite, Load dependency, Sliding friction