Tribological Behavior and Self-Healing Properties of Ni3Al Matrix Self-Lubricating Composites Containing Sn-Ag-Cu and Ti3SiC2 from 20 to 800 °C

As a high-temperature structural material, Ni3Al matrix composites are often used to manufacture basic mechanical components that need be in conditions. To meet the increasing demand for metal with an excellent tribological performance over wide temperature range, self-lubricating containing Sn-Ag-Cu and Ti3SiC2 (NST) were synthesized via laser-melting deposition. Dry sliding friction tests of NST against Si3N4 ball undertaken from 20 800 °C investigate behavior wear-triggered self-healing properties. The results show behaviors strongly dependent on testing At low moderate temperatures 400 °C, as flows into cracks is oxidized during friction, while worn surface filled oxides consisting mainly Al2O3, SnO2 CuO. higher 600 by principal TiO2 SiO2 due partial decomposition oxidation Ti3SiC2. Compared other temperatures, recovery ratio relative base alloy highest at which about 76.4%. synergistic action mechanisms crack play significant role forming stable solid lubricating film, improving anti-friction wear resistance NST. provide solution allowing achieve lubrication stability range virtue