An Experimental Investigation of Semi-Interpenetrating Network Ceramic Skeleton-Reinforced Al-Alloy Composites Dry Sliding Against Cr12 Die Steel

摘要

Semi-interpenetrating network composite containing 33 vol% ceramics (5Al_2O_3·8SiO_2) and 67 vol% Al-alloy dry sliding against Cr12 cold-work die steel was measured on a SRV4 testing machine. The test procedures include the load sensitivities of the friction and wear at 70℃ and 270℃. Test results show that the friction and wear decreased with the increase of load, whereas the specific energy conversion per countermaterial surface unit increased. The friction level and the specific energy conversion at 70℃ were superior to those at 270℃. Scanning electron microscopy and energy dispersive X-ray spectroscopy analysis revealed at 270℃ the existence of the thicker tribofilms and, with them, more Fe oxides and less Al oxide at the worn composite surfaces in comparison with those at 70℃. A good accordance was obtained between test and analysis results.