前驱体碳热还原法制备纳米碳化铬粉末及其机理研究

发布时间：2018-06-12 03:25

  本文选题：碳化铬 + 纳米粉末　； 参考：《中国钨业》2017年02期

【摘要】：以硝酸铬和葡萄糖为原料,按照一定碳含量配比配置混合溶液,烘干后获得前驱体粉末,然后采用碳热还原法制备纳米碳化铬粉末。利用热重-差热分析、X射线衍射、扫描电镜和透射电镜等测试方法对反应过程及产物的物相和形貌进行表征。结果表明:升高配碳量有利于促进碳热还原反应进行,配碳量过低时产物含有贫碳相碳化铬(Cr_7C_3),配碳量过高则会增加产物残碳量,试验最佳配碳量为25.71%;反应温度为1 100℃、保温时间为1 h时,产物为单一的Cr_3C_2,产物粉末由平均粒径为100 nm的椭球形颗粒组成,分散性好,无明显团聚现象。
[Abstract]:Using chromium nitrate and glucose as raw materials, mixed solution was prepared according to a certain ratio of carbon content, the precursor powder was obtained after drying, and then nanometer chromium carbide powder was prepared by carbothermal reduction method. The reaction process, phase and morphology of the product were characterized by thermogravimetric differential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that increasing the amount of carbon is beneficial to promote the carbothermal reduction reaction. When the amount of carbon is too low, the product contains carbon-poor phase Cr _ 7C _ 3C _ 3, and if the carbon content is too high, it will increase the carbon residue of the product. The optimum carbon content of the experiment is 25.71%, and the reaction temperature is 1 100 鈩，

本文编号：2008088