感应等离子体制备超细氮化钼粉研究  

Preparation of ultrafine molybdenum-nitride powder by induction plasma

作　　者：刘晓平[1] 王快社[1] 何晓梅[1] 顾盼 LIU Xiaoping;WANG Kuaishe;HE Xiaomei;GU Pan(Department of Metallurgy Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《兵器材料科学与工程》2020年第4期81-85,共5页Ordnance Material Science and Engineering

基　　金：陕西省科技统筹创新工程计划战略性新兴产业重大产品(群)项目(2014KTCQ01-35);陕西省教育厅重点实验室项目(17JS066);西安市科技计划项目(JZKD008)。

摘　　要：利用感应等离子体设备,在等离子焰流高温作用下,实现钼粉与氮气的合成,制得超细Mo2N粉,同时研究氮气压力、送粉量和原始钼粉粒度等参数对Mo2N粉的影响。用X射线衍射谱(XRD)表征产物Mo2N粉的物相,利用高分辨率扫描电镜(SEM)和高倍透射电子显微镜(TEM)表征Mo2N粉的形貌和粒度。结果表明:较低氮气压、适当送粉量及小粒度钼粉对提高钼粉氮化率有利,制得纳米级Mo2N粉,且基本为球体;若原料钼粉颗粒度太大或送粉量过大,在瞬间高温下只有钼粉颗粒表面被氮化而心部仍为金属钼。制备Mo2N粉较优工艺参数:等离子功率为65 kW,氮气压为15 kPa,送粉率为60 g/min,原料粉费氏粒度为2~3μm。Using induction plasma system,ultra-fine Mo2N powder was synthesized directly from molybdenum powder and nitrogen gas at high temperature plasma flow.And the effects of the N2 pressure,powder feed rate,and the size of molybdenum powder on the as-synthesized Mo2N powder were studied.The phase composition of the as-synthesized Mo2N powder was evaluated by X-ray diffraction(XRD).The size and morphology of particle of the as-synthesized Mo2N powder were determined by scan electron microscopy(SEM)and transmission electron microscopy(TEM).The results show that the Mo2N powder is spherical,with the particle size of nanometer level.The high yield of ultra-fine molybdenum-nitride is gained when the low N2 pressure,appropriate powder feed rate and small particle size of molybdenum powder are employed.Only the surface of molybdenum powder particle is nitridedanal,its center is still molybdenum at the instantaneous high temperature with the increasing of powder feed rate and particle size of molybdenum powder.The optimal parameters for synthesizing molybdenum nitride are plasma power of 65 kW,N2 pressure of 15 kPa,powder feed rate of 60 g per minute,and raw material powder FSSS 2 to 3μm.

关 键 词：氮化钼 感应等离子体 高温合成 纳米 

分 类 号：TG146.4[一般工业技术—材料科学与工程]