摘要:
以钛铁矿、焦炭粉和高纯氮气为原料,通过热力学计算和试验研究了真空炉内碳热还原氮化过程相转变和产物的C含量。首先采用热力学计算软件HSC分析了钛精矿碳热还原氮化的反应历程;根据热力学分析结果进行了不同反应温度条件下的试验研究;最后对反应产物进行了XRD和SEM-EDS分析。研究结果表明:TiN和TiC的生成主要由Ti3O5→TiN和Ti3O5→TiC控制,两者转化温度分别为:1231℃和1319℃;试验研究表明:在1200℃时,产物中就有TiCxN1-x的生成,整个升温过程中没有出现TiC和TiN的单相,并且随着反应温度升高,TiCxN1-x中C原子含量逐渐增大,当反应温度从1200℃升高到1350℃时,生成物TiCxN1-x的C原子含量由9.8%升高到36.273%,N原子的质量分数42.14%降到18.456%。
Abstract:
In this study,the phase evolution and C content of the products during synthesis of TiCxN1-x by carbothermal reduction-nitridation in a vacuum furnace using ilmenite,coke powder and high purity nitrogen as raw materials were investigated via thermodynamic calculations and experiments.The phase evolution during the carbothermal reduction-nitridation process was analyzed by HSC thermodynamic calculation software.Based on the thermodynamic calculations,experiments at different reaction temperatures were carried out.The products were characterized by XRD and SEM-EDS,respectively.The results indicate that the formation of TiN and TiC is respectively controlled by the procedure of Ti3O5→TiN and Ti3O5→TiC,with the evolution temperature at 1 231 and 1 319 ℃,respectively.The experimental results show that TiCxN1-x can be initially generated at 1 200 ℃,moreover,the single phase of TiN and TiC could not be generated during the whole heating process.The C content of TiCxN1-x gradually increases with increase of temperature,from 9.8% at 1 200 ℃ to 36.273% at 1 350 ℃.Meanwhile,the mass fraction of N in TiCxN1-x decreases from 42.14% to 18.456% with temperature increasing from 1 200 to 1 350 ℃.
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