發(fā)布時間：2018-06-12 03:25

  本文選題：碳化鉻 + 納米粉末　； 參考：《中國鎢業(yè)》2017年02期

【摘要】：以硝酸鉻和葡萄糖為原料,按照一定碳含量配比配置混合溶液,烘干后獲得前驅體粉末,然后采用碳熱還原法制備納米碳化鉻粉末。利用熱重-差熱分析、X射線衍射、掃描電鏡和透射電鏡等測試方法對反應過程及產物的物相和形貌進行表征。結果表明:升高配碳量有利于促進碳熱還原反應進行,配碳量過低時產物含有貧碳相碳化鉻(Cr_7C_3),配碳量過高則會增加產物殘?zhí)剂?試驗最佳配碳量為25.71%;反應溫度為1 100℃、保溫時間為1 h時,產物為單一的Cr_3C_2,產物粉末由平均粒徑為100 nm的橢球形顆粒組成,分散性好,無明顯團聚現(xiàn)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，

本文編號：2008088