High-temperature friction and wear behavior of three-dimensional continuous network Ti2AlC/TiAl composites

Abstract:

Three dimensional continuous network Ti2AlC / TiAl Composites were prepared by vacuum hot pressing. The high temperature oxidation behavior and mechanism of the composites were studied by friction and wear tester. The results show that under the high temperature oxidation condition, the surface of the composite is formed with Al2O3 mossy oxide below 600 ℃, and the TiO2 agglomerate and the mixed layer of TiO2 and Al2O3 are formed at 800 ℃; with the increase of temperature, the friction coefficient decreases to 0.3237 due to the lubrication of the oxide film, and the softening of the substrate and the prominent growth of TiO2 agglomerates make the wear rate increase to 4.5×10-4mm3/(N.m) The abrasive wear is transformed into the mixed wear of abrasive wear and oxidation wear.