Study on Preparation of TiC and NbC Powder by Vacuum Carbothermal Reduction AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TG146.4[金属学及工艺—金属材料]

Citation Information:

TiC and NbC were prepared by vacuum carbothermal reduction of TiO2 and Nb2O5 ball-milled mixture.The effects of molar ratio of TiO2,Nb2O5 and activated carbon,milling time,reduction temperature and reduction time on the preparation of NbC and TiC were studied by orthogonal experiments.The particle size,phase and micro morphology of the mixture and reduction products were analyzed by laser particle size analyzer,X-ray diffractometer(XRD) and scanning electron microscope(SEM).The results show that the order of the influence of the factors on reduction rate is as follows:reduction temperature > milling time of mixture > molar ratio of Nb2O5∶TiO2∶C > reduction time.The optimized experimental conditions are Nb2O5 ∶TiO2 ∶C molar ratio of 1∶3∶20,milling time of 10 h,reduction temperature of 1 600 ℃,and reduction time of 2 h.Under these conditions,the reduction rate of Nb2O5 and TiO2 mixture reaches 93.90%.Vacuum carbothermal reduction of Nb2O5 and TiO2 mixture requires lower temperature than that of Nb2O5 alone,and pure TiC and NbC can be obtained without secondary reduction.In addition,with the increase of the content of TiO2 and activated carbon,the particle size of the reduction product is finer and can reach the nanometer level.