MgO-TiC Reinfoced Copper-matrix Composite by In-situ Synthesis from TiO₂

The MgO-TiC particles reinforced copper-matrix composite are successfully prepared by in-Situ synthesis from TiO₂. The effects of in-situ synthesis on the phase、organization and properties are investigated by using XRD, SEM and mechanical testing means. The results show that the reinforcing phases of the synthesis copper-matrix composite are comprised of Cu、MgO、TiC and a little MgTiO₃. The microstructure of the material is closely related to the content of the reinforcing phase. When the content of the reinforcing phase is relatively small, the MgO-TiC particles are dispersed on the copper matrix; with the increase of the reinforcing phase content, the MgO-TiC particles begin to aggregate. The dimensional change of the material is mainly shrinkage during the sintering process; as the holding time is extended or the temperature is increased, the relative density and hardness of the material with a content of 5% are gradually increased, and gradually decreases when the content is 10%.