Preparation of ZrN-Si_3N_4 composite powder with zircon and carbon black as raw materials

摘要

ZrN-Si3N4 composite powder with low cost from zircon was prepared by carbothermal reduction-nitridation process.The influence of mass ratio of C to ZrSiO4(m(C)/m(ZrSiO4))and soaking time on phase composition and microstructure of the products was studied by means of XRD and SEM-EDS.The formation process of ZrN-Si3N4 composite powder was also analyzed in detail. The results show that with the increase of m(C)/m(ZrSiO4)and soaking time,the formation of Si3N4 and ZrN can be promoted obviously.The ZrN-Si3N4 composite powder with size of 1-2μm can be obtained at 1 773 K for 12 h when m(C)/m(ZrSiO4)is 0.4.