砷在氮化-碳化法制备超细碳化钨粉过程中的细化机理  

Refining mechanisms of arsenic during preparation process of ultrafine WC powder by nitridation−carbonization method

作　　者：易志强 谭敦强[1,2] Zhi-qiang YI;Dun-qiang TAN(School of Physics and Materials Science,Nanchang University,Nanchang 330031,China;International Institute of Materials Innovation,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学物理与材料学院,南昌330031 [2]南昌大学国际材料创新研究院,南昌330031

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第3期966-976,共11页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.52164043, 51564036);the Special Fund Project for Postgraduate Innovation in Jiangxi Province,China (No. YC2020-B008)。

摘　　要：为了简化工艺制备超细WC粉末,在伸钨酸铵前驱体中添加一定量的As元素,采用氮化-碳化法系统研究As在超细WC粉制备过程中的作用机理。结果表明,当碳化温度均为1400℃,氮化温度从500℃升高到600℃,As含量从0增加到0.3%(质量分数)时,所制备的WC粉平均粒径从2.23μm减小到0.22μm,颗粒均匀性显著提高。As元素在氮化产物中以W_(2)O_(3)(AsO_(4))_(2)的形式存在,且容易在氮化产物(NH_(4))_(0.42)WC_(3)和WN表面富集或分布于两相之间,阻碍碳化过程中WC晶粒的长大,从而制备超细WC粉。To simplify the preparation process and prepare ultrafine WC powder,a certain amount of As element was added to the ammonium paratungstate precursor.The mechanism of As in the preparation process of ultrafine WC powder by nitridation-carbonization method was systematically discussed.The results show that when the carbonization temperature was 1400℃,the nitridation temperature increased from 500 to 600℃,and the As content increased from 0 to 0.3 wt.%,the average particle size of the prepared WC powder decreased from 2.23 to 0.22μm,and the particle uniformity was significantly improved.The As element in the nitrided product was in the form of W_(2)O_(3)(AsO_(4))_(2),which was easily enriched or distributed between the two phases on the surface of the nitrided products(NH_(4))_(0.42)WC_(3) and WN,hindering the growth of WC grains during the carbonization process.Consequently,ultrafine WC powder was prepared.

关 键 词：砷 超细WC粉 均匀性 细化机理 氮化 碳化 

分 类 号：TB383.3[一般工业技术—材料科学与工程]