论文部分内容阅读
采用XRD、SEM、XRF以及激光粒度分析仪等分析手段,研究真空条件下碳热还原TiO2制备的碳化钛粉末。热力学计算和实验结果表明:真空条件下容易获得碳化钛,且随温度逐渐升高得到的产物顺序为:Magneli相(Ti4O7)、Ti3O5、Ti2O3、TiCxO1-x和TiC。当物料配比为1:3.2-1:6时,在1550℃保温4h的条件下可获得单相TiC粉末;物料配比为1:4和1:5时,产物粉末为标准化学计量的TiC1.0粉末;物料配比为1:4时,得到的产物为单相低杂质超细碳化钛粉末(D50为3.04μm)、SEM观察表明在产物块体表面存在分布均匀、团聚小、结构疏松的结构。
XRD, SEM, XRF and laser particle size analyzer were used to study the titanium carbide powders prepared by carbothermal reduction of TiO2 under vacuum. Thermodynamic calculations and experimental results show that titanium carbide is easily obtained under vacuum and the order of the products with increasing temperature is: Magneli phase (Ti4O7), Ti3O5, Ti2O3, TiCxO1-x and TiC. When the material ratio is 1: 3.2-1: 6, single-phase TiC powder can be obtained under the condition of 1550 ℃ heat preservation 4h; when the material ratio is 1: 4 and 1: 5, the product powder is the standard stoichiometric TiC1 .0 powder. When the material ratio was 1: 4, the product was single-phase low-impurity superfine titanium carbide powder (D50 was 3.04μm). The SEM observation showed that there was uniform distribution on the surface of the product block, Structure.