Production of MgAl_2O_4-Ti(C,N) composite ceramics by aluminothermic reduction in reducing atmosphere

摘要

In the presence of N_2 and CO gases, MgAl_2O_4 - Ti(C,N) composite has been synthesised by aluminothermic reduction. The phase characterisation and microstructure of this novel composite were investigated by powder X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and electron probe microanalysis (EPMA1 Tl7 results show that the nitridation reaction begins at 1100°C. With an increase of temperature TiC starts and forms Ti(C,N) solid solution with TiN; the grain size of Ti(C,N) grows with increasing temperature the final product is MgAl_O_4-Ti(C,N).