IN SITU SYNTHESIS OF Al/TiC COMPOSITES BY COMBUSTION REACTION IN AN ALUMINIUM MELT

摘要

In situ Al/TiC composites with a homogeneous distribution of TiC reinforcements were prepared by adding a reactant mixture of Al-Ti-C to an Al melt. A certain amount of CuO addition to the Al-Ti-C system dramatically increases the adiabatic temperature and thereby enables to form in situ TiC in an Al melt at a temperature range of 750～920°C. TiC particles with a size of 1～2 μm synthesized by self-propagating high-temperature synthesis (SHS) are present in an Al matrix along with Al_3Ti. Increase in the melt temperature up to 920°C with CuO addition promotes the synthesis of TiC with increasing its volume fraction while less Al_3Ti phases are observed.