VC的氮化反应热力学与动力学分析及其实验验证  

Thermal-dynamics Analysis and Experimental Verification of the Nitridation Reaction of VC

作　　者：刘婷[1] 张立[1] 邓登飞[1] 周磊[1] 张华栋[1] 肖乔平 罗国凯 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《硬质合金》2017年第2期83-89,共7页Cemented Carbides

基　　金：国家自然科学基金(51574292);中南大学贵重仪器设备开放共享基金(2017gxjj014);粉末冶金国家重点实验室基金(2016zzkt05)

摘　　要：VC在含N_2气氛中的稳定性是含V超细WC制备工艺制订应该关注的一个重要问题。热力学与热重分析结果表明,在245~1 272℃温度范围内,在含N_2气氛中,VC会发生氮化反应;超过1 272℃后,在含C环境中,会发生VC氮化产物的脱氮和碳化反应。基于对热重分析曲线的解析,确定VC的氮化反应属于反应控制机制;在此基础上,建立了VC氮化反应速率与温度的关系方程。实验验证结果表明:在1 050℃氮化2 h后,VC粉末的氮化反应已趋稳定,原生态和2 h搅拌球磨活化态VC粉末氮化产物的化学式分别为V(C_(0.68),N_(0.32))和V(C_(0.54),N_(0.46))。The stability of VC in N_2 containing atmosphere is an important issue in the preparation of ultrafine WC containing vanadium. The results of thermodynamics and thermogravimetric analysis show that the nitridation of VC will proceed under N_2 containing atmosphere in the temperature range of 245~1 272 ℃ and a reverse transformation of nitride products will occur when the temperature exceeds 1 272 ℃. Based on the analysis of thermogravimetric curves, it can be concluded that the nitridation reaction of VC powder is in accordance with the reaction control mechanism and the relationship between the nitridation reaction rate of VC and temperature is established. The experimental results show that the nitridation reaction of VC at 1 050 ℃ becomes stable after 2 h nitridation, and the compositions of the nitrided products of the original VC and 2 h attritor milling activated VC are V（C_（0.68）,N_（0.32）） and V（（C_（0.54）,N_（0.46））,respectively.

关 键 词：VC 氮化反应 超细WC 硬质合金 热力学 动力学 

分 类 号：TF123.31[冶金工程—粉末冶金]