| 机械化学还原法制备Al_2O_3-Mo_3Si/Mo_5Si_3纳米复合粉体 |
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| 引用本文： | 陈辉,马勤,宋秋香.机械化学还原法制备Al_2O_3-Mo_3Si/Mo_5Si_3纳米复合粉体[J].北京科技大学学报,2010,32(3). |
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| 作者姓名： | 陈辉 马勤 宋秋香 |
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| 作者单位： | 兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州,730050 |
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| 基金项目： | 甘肃省自然科学基金资助项目(No.3ZS061-A25-038);;兰州理工大学特色研究方向资助项目(No.T200304) |
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| 摘 要： | 以MoO3、Si粉和Al粉为原料,采用机械化学还原法制备了Al2O3-Mo3Si/Mo5Si3纳米复合粉体.利用X射线衍射(XRD)、激光粒度分析仪(LPS)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)和差热-热重分析(DTA-TG)等对复合粉体和球磨过程中粉体的固态反应过程进行表征.结果显示,MoO3-Si-Al混合粉体球磨5h后转变为Al2O3-Mo3Si/Mo5Si3复合粉体,反应为机械诱导的自蔓延反应.球磨20h后,Mo3Si、Mo5Si3和Al2O3的晶粒尺寸分别为27.5、23.3和31.8nm,产物具有纳米晶结构,粉体平均粒度为3.988μm,颗粒呈球形,分布均匀.DTA分析表明,复合粉体在机械化学反应过程中首先发生MoO3和Al之间的铝热反应,之后将发生一系列Mo和Si之间的反应,生成Mo5Si3和Mo3Si.
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| 关 键 词： | 金属硅化物 纳米复合粉体 机械合金化 机械化学还原 |
Preparation of Al_2O_3-Mo_3Si/Mo_5Si_3 nanocomposite powders by mechanochemical reduction method |
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| CHEN Hui,MA Qin,SONG Qiu-xiang.Preparation of Al_2O_3-Mo_3Si/Mo_5Si_3 nanocomposite powders by mechanochemical reduction method[J].Journal of University of Science and Technology Beijing,2010,32(3). |
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| Authors: | CHEN Hui MA Qin SONG Qiu-xiang |
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| Abstract: | Al2O3-Mo3Si/Mo5Si3 nanocomposite powders were synthesized by mechanochemical reduction method with MoO3,Si and Al powders as raw materials.The solid-state reaction process and synthesized composite powders were investigated by XRD,laser particles size analytic instrument,TEM,SEM and DTA-TG method.Experimental results indicated that Al2O3-Mo3Si/Mo5Si3 composite powders were obtained by milling of MoO3-Si-Al powders for 5 h by the mechanical induced self-propagating reactions.The grain sizes of Mo3Si,Mo5Si3 a... |
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| Keywords: | metal silicide nanocomposite powders mechanical alloying mechanochemical reduction |
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