Phase Behavior Analysis of Low-grade Bauxite and Rutile by Carbothermal Reduction-nitridation

摘要

In this study,β-Sialon/Al2O3/TiN diphase powder was synthesized using low-grade bauxite and rutile via carbothermal reduction-nitridation.The phase transitions of low-grade bauxite and rutile in the carbothermal reduction and nitridation process were analyzed by XRD,SEM and EDS.The effects of different reaction parameters such as reaction temperature,rutile addition on the phase composition and microstructure of products were analyzed.The results showed that β-Sialon/Al2O3/TiN powder was prepared using low-grade bauxite and rutile as raw materials and coke as reducing agent by carbothermal reduction-nitridation reaction in flowing nitrogen atmosphere of 0.03 MPa at 1350-1375 °C,for 4 h.