The Behavior and Effect of Rare Earth CeO_2 on In-Situ TiC/Al Composite

摘要

Rare earth CeO_2 was investigated as an additive for in-situ preparation of TiC/Al composites using XD (exothermal dispersion) + casting technology. Experiment results showed that an optimum CeO_2 addition of 0.5 wt pct promotes the generation and refinement of TiC particles, prevents the formation of Al_3Ti, increases the wettability between the TiC ceramic particles and the Al matrix, and improves the mechanical properties of composite. A corresponding thermodynamic model was proposed for the mechanism.