Production of MgAl{sub}2O{sub}4-Ti(C,N) composite ceramics by aluminothermic reduction in reducing atmosphere

摘要

In the presence of N{sub}2 and CO gases, MgAl{sub}2O{sub}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 (EPMA). The results show that the nitridation reaction begins at 1100℃. With an increase of temperature, TiC starts to appear and forms Ti(C,N) solid solution with TiN; the grain size of Ti(C,N) grows with increasing temperature and the final product is MgAl{sub}2O{sub}4-Ti(C,N).