缺碳预还原MoO_(3)+氢气深脱氧工艺制备超细钼粉  

Preparation of ultrafine Mo powders byMoO_(3) pre-reduction with insufficient carbon and hydrogen deep reduction

作　　者：张勇 张国华 周国治 ZHANG Yong;ZHANG Guo-Hua;CHOU Kuo-Chih(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《粉末冶金技术》2021年第4期339-344,357,共7页Powder Metallurgy Technology

摘　　要：以炭黑为还原剂还原MoO_(3)制备存在少量MoO2的预还原Mo粉,然后对预还原Mo粉进行氢气深还原,成功制备出平均粒径为99~190 nm的超细钼粉,研究了碳热还原温度对Mo粉平均粒度和残碳量的影响。结果表明,在同一还原温度下,当C/MoO_(3)摩尔比从2.0增加到2.1时,产物的粒径变化很小。碳热还原温度对产物粒径和纯度有显著影响。当C/MoO_(3)摩尔比为2.1时,还原温度从950℃增加到1150℃,氢还原后钼粉的平均粒径从100 nm增加到190 nm,且残碳量(质量分数)由0.030%降低到0.009%。The pre-reduction molybdenum powders containing minor amount of MoO2 were prepared by the carbothermic reduction of MoO_(3),using the carbon black as the reducing agent,then the obtained pre-reduction molybdenum powders were deep reduced by hydrogen to finally prepare the ultrafine molybdenum powders with the average particle size of 99 nm to 190 nm.The effects of the carbothermic reduction temperature on the particle size and the residual carbon content by mass of the ultrafine molybdenum powders were studied.In the results,with the increase of C/MoO_(3)molar ratio from 2.0 to 2.1,the particle sizes of the ultrafine molybdenum powder products change little at the same reduction temperature.But the carbothermal reduction temperature shows a significant effect on the particle size and purity of products.When the C/MoO_(3)molar ratio is 2.1,with the increase of reduction temperature from 950℃to 1150℃,the average particle sizes of products increase from 100 nm to 190 nm,and the content of the residual carbon by mass decreases from 0.030%to 0.009%after the hydrogen reduction.

关 键 词：超细钼粉 碳热还原 氢气还原 形核 长大 

分 类 号：TF8[冶金工程—有色金属冶金]