机械化学反应合成Fe_3Al-Al_2O_3复合粉体  

Synthesis of Fe_3Al-Al_2O_3 composite powders by mechanochemical reaction

作　　者：贾建刚[1] 郭铁明[1] 张建斌[1] 安亮[2] 季根顺[1] 马勤[1] 

机构地区：[1]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,甘肃兰州730050 [2]兰州工业学院,甘肃兰州730050

出　　处：《材料热处理学报》2013年第6期1-4,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金青年基金项目(51001057);兰州理工大学红柳青年教师培养计划(201203)

摘　　要：以Fe3O4粉和Al粉为原料,采用机械球磨诱发化学反应制备了Fe3Al-Al2O3纳米晶复合粉体。利用X射线衍射仪(XRD)和附带能量色散谱仪(EDS)的扫描电子显微镜(SEM)对复合粉体球磨过程中的固态反应过程、表面形貌进行表征。结果表明,球磨过程中,30 min后混合粉末中开始出现少量的Al2O3颗粒,1 h后大部分Fe3O4被还原,形成α-Al2O3、θ-Al2O3、Fe(Al)固溶体和FeO,另有Al剩余。球磨3 h后,大部分的θ-Al2O3转变为α-Al2O3,Fe(Al)固溶体、FeO和剩余的Al粉在机械力的作用下反应形成FeAl化合物和Fe.911O。继续球磨至5 h后,FeAl化合物和Fe.911O相互反应而完全消耗,得到Fe3Al-Al2O3复合粉体。机械力诱发的Fe3O4和Al之间的反应属于突发型反应,诱发反应的临界球磨时间约为50 min。Fe3 Al-Al2O3 nano-composite powders were synthesized by mechanochemical reaction of Fe3 O4-A1 powder mixtures. Phase evolution and structural development during ball milling were investigated by XRD, SEM equipped with EDS. The results show that after milling for 30 rain, a small quantity of Al2O3 is formed. Most of Fe304 is reduced by A1 and α-A1203 , θ-AI2O3 , Fe（A1） solid solution and FeO are formed after milling for 1 h. After milling for 3 h, θ-A1203 is transformed to α-A1203 , while Fe（A1） solid solution, FeO and the residual A1 are transformed to FeAI intermetallic and Fe. 9110 due to the mechanical force. Continuous milling for 5 h, FeA1 intermetallis reacts with Fe. 9110 completely and Fe3 A1-A12 03 composite powders are obtained. The mechanically activated reaction between Fe304 and A1 is suddenly occurring type and the critical milling time is 50 min.

关 键 词：FE3AL AL2O3 机械化学 纳米复合粉体 

分 类 号：TB383[一般工业技术—材料科学与工程]