碳化温度对V_8C_7粉末性能的影响  

Effect of Carbonization Temperature on Performance of V_8C_7 Powder

作　　者：罗奕兵[1] 颜练武[2,3] 

机构地区：[1]长沙理工大学汽车与机械工程学院,湖南长沙410114 [2]硬质合金国家重点实验室,湖南株洲412000 [3]株洲硬质合金集团有限公司,湖南株洲412000

出　　处：《硬质合金》2010年第6期354-357,共4页Cemented Carbides

摘　　要：采用X衍射和透射电镜研究碳化温度对"V_2O_5溶于有机酸→喷雾干燥→真空碳化"制备的V_8C_7粉末性能的影响。结果表明:随碳化温度的增加,V_8C_7粉末的化合碳含量增加,游离碳含量降低;在1 000℃碳化时,粉末有唯一的VC_(1-x)相,而在1100～1200℃碳化时,可得到有序分布的完整V_8C_7相;粉末在1 100℃碳化后,颗粒尺寸为30～50 nm,晶粒尺寸约为30 nm,粉末颗粒为类球形且分散性好;该制备方法可有效降低V_2C_7粉末的碳化温度,获得晶粒细小的V_8C_7粉末。Using X-ray diffractometer and scanning electron microscope,the effect of carbonization temperature on the property of V_8C_7 powder prepared by the process of ＂V_2O_5 dissolved in oranic acid solution→spray drying→vacuum carburization＂ was investigated.The results show that the content of carbide carbon increases and the content of free carbon reduces with carbonization temperature increment When carbonized at 1 100℃,the powder has only phase VC_（1-x）; while carbonized from the range of 1 100℃to 1 200℃,ordered and complete phase V_8C_7 can be obtainec.After carbonized at 1 100℃,the size of powder particle ranges from 30 nm to 50 nm,and the grain size is about 30 nm.The pattern of the powder likes globular shape,and the dispersity is good.The process can effectively decrease carbonization temperature so as to obtain the V_8C_7 powder of fine grain.

关 键 词：碳化钒 真空碳化 V_8C_7 

分 类 号：TQ127.13[化学工程—无机化工]