机械化学合成Ni_2Al_3/Al_2O_3去合金化制备Raney-Ni/Al_2O_3复合粉体  

Preparation of Raney-Ni/Al_2O_3 Powder Composites by De-alloying of Mechanochemical Synthesized Ni_2Al_3/Al_2O_3 Powders

作　　者：刘第强 贾建刚[2] 高昌琦 王建宏[1] LIU Diqiang;JIA Jiangang;GAO Changqi;WANG Jianhong(School of Materials Science and Engineering,North University of China,Taiyuan 030051;State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050)

机构地区：[1]中北大学材料科学与工程学院,太原030051 [2]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

出　　处：《材料导报》2018年第6期957-960,共4页Materials Reports

基　　金：国家自然科学基金(51461029);山西省重点研发计划项目(2016603D12102-1)

摘　　要：以NiO粉和Al粉为原料,采用机械球磨诱发化学反应制备了Ni_2Al_3/Al_2O_3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。将Ni_2Al_3/Al_2O_3复合粉体用浓度为20%的NaOH溶液腐蚀2h,可得到纳米晶结构的Ni/Al_2O_3复合粉体。利用XRD和TEM对其物相和结构进行了表征。结果表明,球磨1h后混合粉末仍为NiO粉和Al粉,球磨3h后NiO粉和Al粉在机械力的作用下反应形成Ni_2Al_3和Al_2O_3粉体,机械力诱发的NiO和Al之间的反应属于突发型反应,继续球磨10h后形成Ni_2Al_3/Al_2O_3复合粉体。Ni_2Al_3/Al_2O_3复合粉体在70℃、质量比为20%NaOH溶液中刻蚀2h,可获得Ni/Al_2O_3复合粉体。Ni2Al3/Al2O3 powder composites were synthesized by mechanochemical reaction of NiO-Al powder mixtures.Phase evolution and structural development during ball milling were investigated by XRD,SEM equipped with EDS.Ni 2Al 3/Al 2O 3 were leached in 20%sodium hydroxide solution for 2 h,to obtain Ni/Al 2O 3 with the grain size of a nano-scale level.The phase composition and the microstructure were studied by XRD and TEM.The results showed that the phase composition of the NiO-Al powder mixtures remained unchanged after 1 h of ball milling.Mechanochemical reaction between NiO and Al powders under the mechanical forces Ni 2Al 3 and Al 2O 3 were formed after 3 h of balling.The mechanically activated reaction between NiO and Al occurred in sudden.Ni 2Al 3/Al 2O 3 powder composites were formed after 10 h of ball milling.Ni 2Al 3/Al 2O 3 powder composites were etched in a 20%sodium hydroxide solution at 70℃for 2 h and Ni/Al 2O 3 powder composites was obtained.

关 键 词：RANEY-NI 去合金化 机械化学合成 Ni2Al3 

分 类 号：TB34[一般工业技术—材料科学与工程]